blob: 652c1420354f7692ca3dd16ba69a3442e8df3177 [file] [log] [blame]
Dan Handley610e7e12018-03-01 18:44:00 +00001Arm CPU Specific Build Macros
Douglas Raillardd7c21b72017-06-28 15:23:03 +01002=============================
3
Douglas Raillardd7c21b72017-06-28 15:23:03 +01004This document describes the various build options present in the CPU specific
5operations framework to enable errata workarounds and to enable optimizations
6for a specific CPU on a platform.
7
Dimitris Papastamos446f7f12017-11-30 14:53:53 +00008Security Vulnerability Workarounds
9----------------------------------
10
Dan Handley610e7e12018-03-01 18:44:00 +000011TF-A exports a series of build flags which control which security
12vulnerability workarounds should be applied at runtime.
Dimitris Papastamos446f7f12017-11-30 14:53:53 +000013
14- ``WORKAROUND_CVE_2017_5715``: Enables the security workaround for
Dimitris Papastamos6d1f4992018-03-28 12:06:40 +010015 `CVE-2017-5715`_. This flag can be set to 0 by the platform if none
16 of the PEs in the system need the workaround. Setting this flag to 0 provides
17 no performance benefit for non-affected platforms, it just helps to comply
18 with the recommendation in the spec regarding workaround discovery.
19 Defaults to 1.
Dimitris Papastamos446f7f12017-11-30 14:53:53 +000020
Dimitris Papastamose6625ec2018-04-05 14:38:26 +010021- ``WORKAROUND_CVE_2018_3639``: Enables the security workaround for
22 `CVE-2018-3639`_. Defaults to 1. The TF-A project recommends to keep
23 the default value of 1 even on platforms that are unaffected by
24 CVE-2018-3639, in order to comply with the recommendation in the spec
25 regarding workaround discovery.
26
Dimitris Papastamosba51d9e2018-05-16 11:36:14 +010027- ``DYNAMIC_WORKAROUND_CVE_2018_3639``: Enables dynamic mitigation for
28 `CVE-2018-3639`_. This build option should be set to 1 if the target
29 platform contains at least 1 CPU that requires dynamic mitigation.
30 Defaults to 0.
31
Bipin Ravi86499742022-01-18 01:59:06 -060032- ``WORKAROUND_CVE_2022_23960``: Enables mitigation for `CVE-2022-23960`_.
33 This build option should be set to 1 if the target platform contains at
34 least 1 CPU that requires this mitigation. Defaults to 1.
35
Paul Beesleyf8640672019-04-12 14:19:42 +010036.. _arm_cpu_macros_errata_workarounds:
37
Douglas Raillardd7c21b72017-06-28 15:23:03 +010038CPU Errata Workarounds
39----------------------
40
Dan Handley610e7e12018-03-01 18:44:00 +000041TF-A exports a series of build flags which control the errata workarounds that
42are applied to each CPU by the reset handler. The errata details can be found
43in the CPU specific errata documents published by Arm:
Douglas Raillardd7c21b72017-06-28 15:23:03 +010044
45- `Cortex-A53 MPCore Software Developers Errata Notice`_
46- `Cortex-A57 MPCore Software Developers Errata Notice`_
Eleanor Bonnicic3b4ca12017-08-02 18:33:41 +010047- `Cortex-A72 MPCore Software Developers Errata Notice`_
Douglas Raillardd7c21b72017-06-28 15:23:03 +010048
49The errata workarounds are implemented for a particular revision or a set of
50processor revisions. This is checked by the reset handler at runtime. Each
51errata workaround is identified by its ``ID`` as specified in the processor's
52errata notice document. The format of the define used to enable/disable the
53errata workaround is ``ERRATA_<Processor name>_<ID>``, where the ``Processor name``
54is for example ``A57`` for the ``Cortex_A57`` CPU.
55
Boyan Karatotevd71b5d72023-02-07 15:46:50 +000056Refer to :ref:`firmware_design_cpu_errata_implementation` for information on how to
Paul Beesleyf8640672019-04-12 14:19:42 +010057write errata workaround functions.
Douglas Raillardd7c21b72017-06-28 15:23:03 +010058
59All workarounds are disabled by default. The platform is responsible for
60enabling these workarounds according to its requirement by defining the
61errata workaround build flags in the platform specific makefile. In case
62these workarounds are enabled for the wrong CPU revision then the errata
63workaround is not applied. In the DEBUG build, this is indicated by
64printing a warning to the crash console.
65
66In the current implementation, a platform which has more than 1 variant
67with different revisions of a processor has no runtime mechanism available
68for it to specify which errata workarounds should be enabled or not.
69
John Tsichritzis4daa1de2018-07-23 09:11:59 +010070The value of the build flags is 0 by default, that is, disabled. A value of 1
71will enable it.
Douglas Raillardd7c21b72017-06-28 15:23:03 +010072
Joel Hutton26d16762019-04-10 12:52:52 +010073For Cortex-A9, the following errata build flags are defined :
74
Louis Mayencourte6469d52019-04-18 12:11:25 +010075- ``ERRATA_A9_794073``: This applies errata 794073 workaround to Cortex-A9
Joel Hutton26d16762019-04-10 12:52:52 +010076 CPU. This needs to be enabled for all revisions of the CPU.
77
Ambroise Vincentd4a51eb2019-03-04 16:56:26 +000078For Cortex-A15, the following errata build flags are defined :
79
80- ``ERRATA_A15_816470``: This applies errata 816470 workaround to Cortex-A15
81 CPU. This needs to be enabled only for revision >= r3p0 of the CPU.
82
Ambroise Vincent68b38122019-03-05 09:54:21 +000083- ``ERRATA_A15_827671``: This applies errata 827671 workaround to Cortex-A15
84 CPU. This needs to be enabled only for revision >= r3p0 of the CPU.
85
Ambroise Vincent8cf9eef2019-02-28 16:23:53 +000086For Cortex-A17, the following errata build flags are defined :
87
88- ``ERRATA_A17_852421``: This applies errata 852421 workaround to Cortex-A17
89 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
90
Ambroise Vincentfa5c9512019-03-04 13:20:56 +000091- ``ERRATA_A17_852423``: This applies errata 852423 workaround to Cortex-A17
92 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
93
Louis Mayencourt8a061272019-04-05 16:25:25 +010094For Cortex-A35, the following errata build flags are defined :
95
96- ``ERRATA_A35_855472``: This applies errata 855472 workaround to Cortex-A35
97 CPUs. This needs to be enabled only for revision r0p0 of Cortex-A35.
98
John Tsichritzis4daa1de2018-07-23 09:11:59 +010099For Cortex-A53, the following errata build flags are defined :
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100100
Ambroise Vincentf5fdfbc2019-02-21 14:16:24 +0000101- ``ERRATA_A53_819472``: This applies errata 819472 workaround to all
102 CPUs. This needs to be enabled only for revision <= r0p1 of Cortex-A53.
103
104- ``ERRATA_A53_824069``: This applies errata 824069 workaround to all
105 CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53.
106
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100107- ``ERRATA_A53_826319``: This applies errata 826319 workaround to Cortex-A53
108 CPU. This needs to be enabled only for revision <= r0p2 of the CPU.
109
Ambroise Vincentf5fdfbc2019-02-21 14:16:24 +0000110- ``ERRATA_A53_827319``: This applies errata 827319 workaround to all
111 CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53.
112
Douglas Raillardb52353a2017-07-17 14:14:52 +0100113- ``ERRATA_A53_835769``: This applies erratum 835769 workaround at compile and
114 link time to Cortex-A53 CPU. This needs to be enabled for some variants of
115 revision <= r0p4. This workaround can lead the linker to create ``*.stub``
116 sections.
117
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100118- ``ERRATA_A53_836870``: This applies errata 836870 workaround to Cortex-A53
119 CPU. This needs to be enabled only for revision <= r0p3 of the CPU. From
Boyan Karatotev6f20c7f2023-04-03 16:28:10 +0100120 r0p4 and onwards, this errata is enabled by default in hardware. Identical to
121 ``A53_DISABLE_NON_TEMPORAL_HINT``.
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100122
Douglas Raillardb52353a2017-07-17 14:14:52 +0100123- ``ERRATA_A53_843419``: This applies erratum 843419 workaround at link time
124 to Cortex-A53 CPU. This needs to be enabled for some variants of revision
125 <= r0p4. This workaround can lead the linker to emit ``*.stub`` sections
126 which are 4kB aligned.
127
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100128- ``ERRATA_A53_855873``: This applies errata 855873 workaround to Cortex-A53
129 CPUs. Though the erratum is present in every revision of the CPU,
130 this workaround is only applied to CPUs from r0p3 onwards, which feature
Sandrine Bailleux15530dd2019-02-08 15:26:36 +0100131 a chicken bit in CPUACTLR_EL1 to enable a hardware workaround.
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100132 Earlier revisions of the CPU have other errata which require the same
133 workaround in software, so they should be covered anyway.
134
Manish V Badarkhea59fa012020-07-31 08:38:49 +0100135- ``ERRATA_A53_1530924``: This applies errata 1530924 workaround to all
136 revisions of Cortex-A53 CPU.
137
Ambroise Vincent7927fa02019-02-21 16:20:43 +0000138For Cortex-A55, the following errata build flags are defined :
139
140- ``ERRATA_A55_768277``: This applies errata 768277 workaround to Cortex-A55
141 CPU. This needs to be enabled only for revision r0p0 of the CPU.
142
Ambroise Vincent6f319602019-02-21 16:25:37 +0000143- ``ERRATA_A55_778703``: This applies errata 778703 workaround to Cortex-A55
144 CPU. This needs to be enabled only for revision r0p0 of the CPU.
145
Ambroise Vincent6a77f052019-02-21 16:27:34 +0000146- ``ERRATA_A55_798797``: This applies errata 798797 workaround to Cortex-A55
147 CPU. This needs to be enabled only for revision r0p0 of the CPU.
148
Ambroise Vincentdd961f72019-02-21 16:29:16 +0000149- ``ERRATA_A55_846532``: This applies errata 846532 workaround to Cortex-A55
150 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.
151
Ambroise Vincenta1d64462019-02-21 16:29:50 +0000152- ``ERRATA_A55_903758``: This applies errata 903758 workaround to Cortex-A55
153 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.
154
Ambroise Vincentb72fe7a2019-05-28 09:52:48 +0100155- ``ERRATA_A55_1221012``: This applies errata 1221012 workaround to Cortex-A55
156 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
157
Manish V Badarkhea59fa012020-07-31 08:38:49 +0100158- ``ERRATA_A55_1530923``: This applies errata 1530923 workaround to all
159 revisions of Cortex-A55 CPU.
160
John Tsichritzis4daa1de2018-07-23 09:11:59 +0100161For Cortex-A57, the following errata build flags are defined :
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100162
163- ``ERRATA_A57_806969``: This applies errata 806969 workaround to Cortex-A57
164 CPU. This needs to be enabled only for revision r0p0 of the CPU.
165
166- ``ERRATA_A57_813419``: This applies errata 813419 workaround to Cortex-A57
167 CPU. This needs to be enabled only for revision r0p0 of the CPU.
168
169- ``ERRATA_A57_813420``: This applies errata 813420 workaround to Cortex-A57
170 CPU. This needs to be enabled only for revision r0p0 of the CPU.
171
Ambroise Vincent1b0db762019-02-21 16:35:07 +0000172- ``ERRATA_A57_814670``: This applies errata 814670 workaround to Cortex-A57
173 CPU. This needs to be enabled only for revision r0p0 of the CPU.
174
Ambroise Vincentaa2c0292019-02-21 16:35:49 +0000175- ``ERRATA_A57_817169``: This applies errata 817169 workaround to Cortex-A57
176 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.
177
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100178- ``ERRATA_A57_826974``: This applies errata 826974 workaround to Cortex-A57
179 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
180
181- ``ERRATA_A57_826977``: This applies errata 826977 workaround to Cortex-A57
182 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
183
184- ``ERRATA_A57_828024``: This applies errata 828024 workaround to Cortex-A57
185 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
186
187- ``ERRATA_A57_829520``: This applies errata 829520 workaround to Cortex-A57
188 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
189
190- ``ERRATA_A57_833471``: This applies errata 833471 workaround to Cortex-A57
191 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.
192
Eleanor Bonnici0c9bd272017-08-02 16:35:04 +0100193- ``ERRATA_A57_859972``: This applies errata 859972 workaround to Cortex-A57
194 CPU. This needs to be enabled only for revision <= r1p3 of the CPU.
195
Manish V Badarkhea59fa012020-07-31 08:38:49 +0100196- ``ERRATA_A57_1319537``: This applies errata 1319537 workaround to all
197 revisions of Cortex-A57 CPU.
Eleanor Bonnicic3b4ca12017-08-02 18:33:41 +0100198
John Tsichritzis4daa1de2018-07-23 09:11:59 +0100199For Cortex-A72, the following errata build flags are defined :
Eleanor Bonnicic3b4ca12017-08-02 18:33:41 +0100200
201- ``ERRATA_A72_859971``: This applies errata 859971 workaround to Cortex-A72
202 CPU. This needs to be enabled only for revision <= r0p3 of the CPU.
203
Manish V Badarkhea59fa012020-07-31 08:38:49 +0100204- ``ERRATA_A72_1319367``: This applies errata 1319367 workaround to all
205 revisions of Cortex-A72 CPU.
206
Louis Mayencourt4405de62019-02-21 16:38:16 +0000207For Cortex-A73, the following errata build flags are defined :
208
Louis Mayencourtd69722c2019-02-27 14:24:16 +0000209- ``ERRATA_A73_852427``: This applies errata 852427 workaround to Cortex-A73
210 CPU. This needs to be enabled only for revision r0p0 of the CPU.
211
Louis Mayencourt4405de62019-02-21 16:38:16 +0000212- ``ERRATA_A73_855423``: This applies errata 855423 workaround to Cortex-A73
213 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.
214
Louis Mayencourt78a0aed2019-02-20 12:11:41 +0000215For Cortex-A75, the following errata build flags are defined :
216
217- ``ERRATA_A75_764081``: This applies errata 764081 workaround to Cortex-A75
218 CPU. This needs to be enabled only for revision r0p0 of the CPU.
219
Louis Mayencourt8d868702019-02-25 14:57:57 +0000220- ``ERRATA_A75_790748``: This applies errata 790748 workaround to Cortex-A75
221 CPU. This needs to be enabled only for revision r0p0 of the CPU.
222
Louis Mayencourt09924472019-02-21 17:35:07 +0000223For Cortex-A76, the following errata build flags are defined :
224
Louis Mayencourt59fa2182019-02-25 15:17:44 +0000225- ``ERRATA_A76_1073348``: This applies errata 1073348 workaround to Cortex-A76
226 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
227
Louis Mayencourt09924472019-02-21 17:35:07 +0000228- ``ERRATA_A76_1130799``: This applies errata 1130799 workaround to Cortex-A76
229 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
230
Louis Mayencourtadda9d42019-02-25 11:37:38 +0000231- ``ERRATA_A76_1220197``: This applies errata 1220197 workaround to Cortex-A76
232 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
233
Soby Mathew1d3ba1c2019-05-01 09:43:18 +0100234- ``ERRATA_A76_1257314``: This applies errata 1257314 workaround to Cortex-A76
235 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
236
237- ``ERRATA_A76_1262606``: This applies errata 1262606 workaround to Cortex-A76
238 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
239
240- ``ERRATA_A76_1262888``: This applies errata 1262888 workaround to Cortex-A76
241 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
242
243- ``ERRATA_A76_1275112``: This applies errata 1275112 workaround to Cortex-A76
244 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
245
johpow019603f982020-05-29 14:17:38 -0500246- ``ERRATA_A76_1791580``: This applies errata 1791580 workaround to Cortex-A76
247 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.
248
Manish V Badarkhea59fa012020-07-31 08:38:49 +0100249- ``ERRATA_A76_1165522``: This applies errata 1165522 workaround to all
250 revisions of Cortex-A76 CPU. This errata is fixed in r3p0 but due to
251 limitation of errata framework this errata is applied to all revisions
252 of Cortex-A76 CPU.
253
johpow0181365e32020-09-29 17:19:09 -0500254- ``ERRATA_A76_1868343``: This applies errata 1868343 workaround to Cortex-A76
255 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.
256
johpow013e34e922020-12-15 19:02:18 -0600257- ``ERRATA_A76_1946160``: This applies errata 1946160 workaround to Cortex-A76
258 CPU. This needs to be enabled only for revisions r3p0 - r4p1 of the CPU.
259
Bipin Ravi23e29e42022-11-02 16:50:03 -0500260- ``ERRATA_A76_2743102``: This applies errata 2743102 workaround to Cortex-A76
261 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is
262 still open.
263
johpow0168aedc72020-06-03 15:23:31 -0500264For Cortex-A77, the following errata build flags are defined :
265
laurenw-arm99ad9762020-07-14 14:18:34 -0500266- ``ERRATA_A77_1508412``: This applies errata 1508412 workaround to Cortex-A77
267 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
268
johpow01a2fa12c2020-09-10 13:39:26 -0500269- ``ERRATA_A77_1925769``: This applies errata 1925769 workaround to Cortex-A77
270 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
271
laurenw-armf5dbbef2021-03-23 13:09:35 -0500272- ``ERRATA_A77_1946167``: This applies errata 1946167 workaround to Cortex-A77
273 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.
274
johpow01eb146102021-05-03 13:37:13 -0500275- ``ERRATA_A77_1791578``: This applies errata 1791578 workaround to Cortex-A77
276 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.
277
Bipin Ravi8e916622022-06-08 15:27:00 -0500278- ``ERRATA_A77_2356587``: This applies errata 2356587 workaround to Cortex-A77
279 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.
280
Boyan Karatoteve5cf16b2022-09-27 10:37:54 +0100281 - ``ERRATA_A77_1800714``: This applies errata 1800714 workaround to Cortex-A77
282 CPU. This needs to be enabled for revisions <= r1p1 of the CPU.
283
Boyan Karatotevaaf5d292022-11-01 11:22:12 +0000284 - ``ERRATA_A77_2743100``: This applies errata 2743100 workaround to Cortex-A77
285 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.
286
Jimmy Brisson3571fb92020-06-01 10:18:22 -0500287For Cortex-A78, the following errata build flags are defined :
Madhukar Pappireddy4efede72019-12-18 15:56:27 -0600288
Jimmy Brisson3571fb92020-06-01 10:18:22 -0500289- ``ERRATA_A78_1688305``: This applies errata 1688305 workaround to Cortex-A78
290 CPU. This needs to be enabled only for revision r0p0 - r1p0 of the CPU.
Madhukar Pappireddy4efede72019-12-18 15:56:27 -0600291
johpow019131eb82020-10-06 17:55:25 -0500292- ``ERRATA_A78_1941498``: This applies errata 1941498 workaround to Cortex-A78
293 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU.
294
johpow0185ea43d2020-10-07 15:08:01 -0500295- ``ERRATA_A78_1951500``: This applies errata 1951500 workaround to Cortex-A78
296 CPU. This needs to be enabled for revisions r1p0 and r1p1, r0p0 has the same
297 issue but there is no workaround for that revision.
298
johpow01b3e82942021-04-30 18:08:52 -0500299- ``ERRATA_A78_1821534``: This applies errata 1821534 workaround to Cortex-A78
300 CPU. This needs to be enabled for revisions r0p0 and r1p0.
301
nayanpatel-arm80bf7a52021-08-11 13:33:00 -0700302- ``ERRATA_A78_1952683``: This applies errata 1952683 workaround to Cortex-A78
303 CPU. This needs to be enabled for revision r0p0, it is fixed in r1p0.
304
nayanpatel-arm39e08652021-09-28 17:31:50 -0700305- ``ERRATA_A78_2132060``: This applies errata 2132060 workaround to Cortex-A78
306 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2. It
307 is still open.
308
johpow0145c17242021-09-02 17:53:30 -0500309- ``ERRATA_A78_2242635``: This applies errata 2242635 workaround to Cortex-A78
310 CPU. This needs to be enabled for revisions r1p0, r1p1, and r1p2. The issue
311 is present in r0p0 but there is no workaround. It is still open.
312
John Powell12bc0de2022-05-03 15:22:57 -0500313- ``ERRATA_A78_2376745``: This applies errata 2376745 workaround to Cortex-A78
314 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and
315 it is still open.
316
John Powella93b7e52022-05-03 15:52:11 -0500317- ``ERRATA_A78_2395406``: This applies errata 2395406 workaround to Cortex-A78
318 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and
319 it is still open.
320
Sona Mathewc5b386d2023-03-14 16:50:36 -0500321- ``ERRATA_A78_2712571``: This applies erratum 2712571 workaround to Cortex-A78
322 CPU, this erratum affects system configurations that do not use an ARM
323 interconnect IP. This needs to be enabled for revisions r0p0, r1p0, r1p1
324 and r1p2 and it is still open.
325
Bipin Ravi33100ef2023-02-28 14:51:28 -0600326- ``ERRATA_A78_2742426``: This applies erratum 2742426 workaround to Cortex-A78
327 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and
328 it is still open.
329
Bipin Ravi8f78e0d2022-12-15 14:48:21 -0600330- ``ERRATA_A78_2772019``: This applies errata 2772019 workaround to Cortex-A78
331 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and
332 it is still open.
333
Sona Mathewf13c1a92023-01-11 12:55:30 -0600334- ``ERRATA_A78_2779479``: This applies erratum 2779479 workaround to Cortex-A78
335 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and
336 it is still open.
337
Sona Mathew20897752023-10-10 16:48:57 -0500338For Cortex-A78AE, the following errata build flags are defined :
Varun Wadekara3110ad2021-07-27 00:39:40 -0700339
Varun Wadekar9030a6c2022-03-09 22:04:00 +0000340- ``ERRATA_A78_AE_1941500`` : This applies errata 1941500 workaround to
Sona Mathew20897752023-10-10 16:48:57 -0500341 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1.
Varun Wadekar9030a6c2022-03-09 22:04:00 +0000342 This erratum is still open.
343
344- ``ERRATA_A78_AE_1951502`` : This applies errata 1951502 workaround to
Sona Mathew20897752023-10-10 16:48:57 -0500345 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This
Varun Wadekar9030a6c2022-03-09 22:04:00 +0000346 erratum is still open.
Varun Wadekar0914fc42021-07-27 02:32:29 -0700347
Varun Wadekar9030a6c2022-03-09 22:04:00 +0000348- ``ERRATA_A78_AE_2376748`` : This applies errata 2376748 workaround to
Sona Mathew20897752023-10-10 16:48:57 -0500349 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2.
350 This erratum is still open.
Varun Wadekara3110ad2021-07-27 00:39:40 -0700351
Varun Wadekarac6bf2e2022-03-09 22:20:32 +0000352- ``ERRATA_A78_AE_2395408`` : This applies errata 2395408 workaround to
Sona Mathew20897752023-10-10 16:48:57 -0500353 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This
Varun Wadekarac6bf2e2022-03-09 22:20:32 +0000354 erratum is still open.
355
Sona Mathewc5b386d2023-03-14 16:50:36 -0500356- ``ERRATA_A78_AE_2712574`` : This applies erratum 2712574 workaround to
Sona Mathew20897752023-10-10 16:48:57 -0500357 Cortex-A78AE CPU. This erratum affects system configurations that do not use
Sona Mathewc5b386d2023-03-14 16:50:36 -0500358 an ARM interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and
359 r0p2. This erratum is still open.
360
laurenw-arm4dc18872022-07-12 10:43:52 -0500361For Cortex-A78C, the following errata build flags are defined :
362
Bipin Ravibf205fc2023-03-14 10:04:23 -0500363- ``ERRATA_A78C_1827430`` : This applies errata 1827430 workaround to
364 Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
365 fixed in r0p1.
366
Bipin Ravie49c7042023-03-14 11:03:24 -0500367- ``ERRATA_A78C_1827440`` : This applies errata 1827440 workaround to
368 Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is
369 fixed in r0p1.
370
laurenw-arm4dc18872022-07-12 10:43:52 -0500371- ``ERRATA_A78C_2132064`` : This applies errata 2132064 workaround to
372 Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and
373 it is still open.
374
Bipin Ravi9c36e122022-07-15 17:20:16 -0500375- ``ERRATA_A78C_2242638`` : This applies errata 2242638 workaround to
376 Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and
377 it is still open.
378
Akram Ahmadfbc1edb2022-09-06 11:23:25 +0100379- ``ERRATA_A78C_2376749`` : This applies errata 2376749 workaround to
380 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This
381 erratum is still open.
382
Akram Ahmaddbff7cf2022-07-19 14:38:46 +0100383- ``ERRATA_A78C_2395411`` : This applies errata 2395411 workaround to
384 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This
385 erratum is still open.
386
Bipin Ravi8ca7aba2023-12-20 15:40:44 -0600387- ``ERRATA_A78C_2683027`` : This applies errata 2683027 workaround to
388 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This
389 erratum is still open.
390
Sona Mathewc5b386d2023-03-14 16:50:36 -0500391- ``ERRATA_A78C_2712575`` : This applies erratum 2712575 workaround to
392 Cortex-A78C CPU, this erratum affects system configurations that do not use
393 an ARM interconnect IP. This needs to be enabled for revisions r0p1 and r0p2
394 and is still open.
395
Sona Mathewdfde5042023-11-14 14:00:48 -0600396- ``ERRATA_A78C_2743232`` : This applies erratum 2743232 workaround to
397 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2.
398 This erratum is still open.
399
Bipin Ravie0b52cc2023-01-18 11:03:21 -0600400- ``ERRATA_A78C_2772121`` : This applies errata 2772121 workaround to
401 Cortex-A78C CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2.
402 This erratum is still open.
403
Bipin Ravidb091082023-02-28 16:21:51 -0600404- ``ERRATA_A78C_2779484`` : This applies errata 2779484 workaround to
405 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2.
406 This erratum is still open.
407
Okash Khawajabaee3902022-04-21 12:20:21 +0100408For Cortex-X1 CPU, the following errata build flags are defined:
409
410- ``ERRATA_X1_1821534`` : This applies errata 1821534 workaround to Cortex-X1
411 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
412
413- ``ERRATA_X1_1688305`` : This applies errata 1688305 workaround to Cortex-X1
414 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
415
416- ``ERRATA_X1_1827429`` : This applies errata 1827429 workaround to Cortex-X1
417 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.
418
lauwal01bd555f42019-06-24 11:23:50 -0500419For Neoverse N1, the following errata build flags are defined :
420
421- ``ERRATA_N1_1073348``: This applies errata 1073348 workaround to Neoverse-N1
422 CPU. This needs to be enabled only for revision r0p0 and r1p0 of the CPU.
423
lauwal01363ee3c2019-06-24 11:28:34 -0500424- ``ERRATA_N1_1130799``: This applies errata 1130799 workaround to Neoverse-N1
425 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
426
lauwal01f2adb132019-06-24 11:32:40 -0500427- ``ERRATA_N1_1165347``: This applies errata 1165347 workaround to Neoverse-N1
428 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
429
lauwal01e1590442019-06-24 11:35:37 -0500430- ``ERRATA_N1_1207823``: This applies errata 1207823 workaround to Neoverse-N1
431 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
432
lauwal01197f14c2019-06-24 11:38:53 -0500433- ``ERRATA_N1_1220197``: This applies errata 1220197 workaround to Neoverse-N1
434 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.
435
lauwal0107c2a232019-06-24 11:42:02 -0500436- ``ERRATA_N1_1257314``: This applies errata 1257314 workaround to Neoverse-N1
437 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
438
lauwal0142771af2019-06-24 11:44:58 -0500439- ``ERRATA_N1_1262606``: This applies errata 1262606 workaround to Neoverse-N1
440 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
441
lauwal0100396bf2019-06-24 11:47:30 -0500442- ``ERRATA_N1_1262888``: This applies errata 1262888 workaround to Neoverse-N1
443 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
444
lauwal01644b6ed2019-06-24 11:49:01 -0500445- ``ERRATA_N1_1275112``: This applies errata 1275112 workaround to Neoverse-N1
446 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
447
Andre Przywarab9347402019-05-20 14:57:06 +0100448- ``ERRATA_N1_1315703``: This applies errata 1315703 workaround to Neoverse-N1
449 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.
450
laurenw-arm94accd32019-08-20 15:51:24 -0500451- ``ERRATA_N1_1542419``: This applies errata 1542419 workaround to Neoverse-N1
452 CPU. This needs to be enabled only for revisions r3p0 - r4p0 of the CPU.
453
johpow01e2428fd2020-08-05 12:27:12 -0500454- ``ERRATA_N1_1868343``: This applies errata 1868343 workaround to Neoverse-N1
455 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.
456
johpow01f1a84f52020-10-07 14:33:15 -0500457- ``ERRATA_N1_1946160``: This applies errata 1946160 workaround to Neoverse-N1
458 CPU. This needs to be enabled for revisions r3p0, r3p1, r4p0, and r4p1, for
459 revisions r0p0, r1p0, and r2p0 there is no workaround.
460
Bipin Ravi9edf2492022-11-02 16:12:01 -0500461- ``ERRATA_N1_2743102``: This applies errata 2743102 workaround to Neoverse-N1
462 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is
463 still open.
464
johpow01c73b03c2021-05-03 15:33:39 -0500465For Neoverse V1, the following errata build flags are defined :
466
Juan Pablo Conde31c93372022-02-28 14:14:44 -0500467- ``ERRATA_V1_1618635``: This applies errata 1618635 workaround to Neoverse-V1
468 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
469 r1p0.
470
laurenw-arm3c86d832021-08-02 13:22:32 -0500471- ``ERRATA_V1_1774420``: This applies errata 1774420 workaround to Neoverse-V1
472 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed
473 in r1p1.
474
johpow01c73b03c2021-05-03 15:33:39 -0500475- ``ERRATA_V1_1791573``: This applies errata 1791573 workaround to Neoverse-V1
476 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed
477 in r1p1.
478
laurenw-armb1923e92021-08-02 14:40:08 -0500479- ``ERRATA_V1_1852267``: This applies errata 1852267 workaround to Neoverse-V1
480 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed
481 in r1p1.
482
laurenw-arm6b56f962021-08-02 15:00:15 -0500483- ``ERRATA_V1_1925756``: This applies errata 1925756 workaround to Neoverse-V1
484 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.
485
johpow0107acb4f2020-10-07 16:38:37 -0500486- ``ERRATA_V1_1940577``: This applies errata 1940577 workaround to Neoverse-V1
487 CPU. This needs to be enabled only for revision r1p0 and r1p1 of the
488 CPU.
489
johpow0197db6752021-08-02 18:59:08 -0500490- ``ERRATA_V1_1966096``: This applies errata 1966096 workaround to Neoverse-V1
491 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the
492 issue is present in r0p0 as well but there is no workaround for that
493 revision. It is still open.
494
johpow01ad1ca342021-08-03 14:35:20 -0500495- ``ERRATA_V1_2139242``: This applies errata 2139242 workaround to Neoverse-V1
496 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the
497 CPU. It is still open.
498
nayanpatel-armfc26ffe2021-09-28 13:41:03 -0700499- ``ERRATA_V1_2108267``: This applies errata 2108267 workaround to Neoverse-V1
500 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU.
501 It is still open.
502
johpow014de29cb2021-09-02 18:29:17 -0500503- ``ERRATA_V1_2216392``: This applies errata 2216392 workaround to Neoverse-V1
504 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the
505 issue is present in r0p0 as well but there is no workaround for that
506 revision. It is still open.
507
Bipin Ravi971938f2022-06-08 16:28:46 -0500508- ``ERRATA_V1_2294912``: This applies errata 2294912 workaround to Neoverse-V1
Sona Matheweb011172023-10-16 15:12:30 -0500509 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 and r1p2 of
510 the CPU.
Bipin Ravib4cb31f2022-06-14 17:09:23 -0500511
Sona Mathewc54b3ef2023-11-07 13:46:15 -0600512- ``ERRATA_V1_2348377``: This applies errata 2348377 workaroud to Neoverse-V1
513 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU.
514 It has been fixed in r1p2.
515
Bipin Ravib4cb31f2022-06-14 17:09:23 -0500516- ``ERRATA_V1_2372203``: This applies errata 2372203 workaround to Neoverse-V1
517 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU.
Bipin Ravi971938f2022-06-08 16:28:46 -0500518 It is still open.
519
Sona Mathewc5b386d2023-03-14 16:50:36 -0500520- ``ERRATA_V1_2701953``: This applies erratum 2701953 workaround to Neoverse-V1
521 CPU, this erratum affects system configurations that do not use an ARM
522 interconnect IP. This needs to be enabled for revisions r0p0, r1p0 and r1p1.
523 It has been fixed in r1p2.
524
Bipin Ravife4b0c42022-12-15 11:57:53 -0600525- ``ERRATA_V1_2743093``: This applies errata 2743093 workaround to Neoverse-V1
526 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the
527 CPU. It is still open.
528
Sona Mathew2ef5db72023-03-02 15:07:55 -0600529- ``ERRATA_V1_2743233``: This applies erratum 2743233 workaround to Neoverse-V1
530 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2 of the
531 CPU. It is still open.
532
Sona Mathewfe405d02023-01-11 17:04:24 -0600533- ``ERRATA_V1_2779461``: This applies erratum 2779461 workaround to Neoverse-V1
534 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, r1p2 of the
535 CPU. It is still open.
536
Sona Mathewc5b386d2023-03-14 16:50:36 -0500537For Neoverse V2, the following errata build flags are defined :
538
Bipin Ravi4f9b75f2023-09-18 16:34:13 -0500539- ``ERRATA_V2_2331132``: This applies errata 2331132 workaround to Neoverse-V2
540 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is still
541 open.
542
Bipin Raviafcf4fe2023-10-17 19:42:15 -0500543- ``ERRATA_V2_2618597``: This applies errata 2618597 workaround to Neoverse-V2
544 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
545 r0p2.
546
Bipin Ravi4b46c782023-10-17 18:35:55 -0500547- ``ERRATA_V2_2662553``: This applies errata 2662553 workaround to Neoverse-V2
548 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
549 r0p2.
550
Sona Mathewc5b386d2023-03-14 16:50:36 -0500551- ``ERRATA_V2_2719103``: This applies errata 2719103 workaround to Neoverse-V2
552 CPU, this affects system configurations that do not use and ARM interconnect
553 IP. This needs to be enabled for revisions r0p0 and r0p1. It has been fixed
554 in r0p2.
555
Bipin Ravi90aaf982023-09-18 17:27:29 -0500556- ``ERRATA_V2_2719105``: This applies errata 2719105 workaround to Neoverse-V2
557 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
558 r0p2.
559
Bipin Ravia20d0612023-09-18 19:54:41 -0500560- ``ERRATA_V2_2743011``: This applies errata 2743011 workaround to Neoverse-V2
561 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
562 r0p2.
563
Bipin Ravi9d46b352023-09-18 19:28:32 -0500564- ``ERRATA_V2_2779510``: This applies errata 2779510 workaround to Neoverse-V2
565 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in
566 r0p2.
567
Moritz Fischer98870062023-07-06 00:01:23 +0000568- ``ERRATA_V2_2801372``: This applies errata 2801372 workaround to Neoverse-V2
569 CPU, this affects all configurations. This needs to be enabled for revisions
570 r0p0 and r0p1. It has been fixed in r0p2.
571
nayanpatel-arme55d3252021-08-06 16:39:48 -0700572For Cortex-A710, the following errata build flags are defined :
573
574- ``ERRATA_A710_1987031``: This applies errata 1987031 workaround to
575 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
576 r2p0 of the CPU. It is still open.
577
nayanpatel-arm7597d082021-08-25 17:35:15 -0700578- ``ERRATA_A710_2081180``: This applies errata 2081180 workaround to
579 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
580 r2p0 of the CPU. It is still open.
581
Bipin Ravicd39b142021-03-31 16:45:40 -0500582- ``ERRATA_A710_2055002``: This applies errata 2055002 workaround to
583 Cortex-A710 CPU. This needs to be enabled for revisions r1p0, r2p0 of the CPU
584 and is still open.
585
Bipin Ravi87e1d282021-03-31 18:45:55 -0500586- ``ERRATA_A710_2017096``: This applies errata 2017096 workaround to
587 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
588 of the CPU and is still open.
589
nayanpatel-arm0b338b42021-09-16 15:27:53 -0700590- ``ERRATA_A710_2083908``: This applies errata 2083908 workaround to
591 Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU and
592 is still open.
593
nayanpatel-armf2dce0e2021-09-22 12:35:03 -0700594- ``ERRATA_A710_2058056``: This applies errata 2058056 workaround to
595 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
Sona Mathew6d691c52023-10-10 13:51:45 -0500596 and r2p1 of the CPU and is still open.
nayanpatel-armf2dce0e2021-09-22 12:35:03 -0700597
Bipin Ravi32705b12022-02-06 02:32:54 -0600598- ``ERRATA_A710_2267065``: This applies errata 2267065 workaround to
599 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
600 of the CPU and is fixed in r2p1.
601
Bipin Ravid53069b2022-02-06 03:11:44 -0600602- ``ERRATA_A710_2136059``: This applies errata 2136059 workaround to
603 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
604 of the CPU and is fixed in r2p1.
605
Akram Ahmad1714c1d2022-07-21 15:25:08 +0100606- ``ERRATA_A710_2147715``: This applies errata 2147715 workaround to
607 Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU
608 and is fixed in r2p1.
609
Jayanth Dodderi Chidanandde4f5892022-09-01 22:09:54 +0100610- ``ERRATA_A710_2216384``: This applies errata 2216384 workaround to
611 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
612 of the CPU and is fixed in r2p1.
613
johpow017249fd02022-02-28 18:34:04 -0600614- ``ERRATA_A710_2282622``: This applies errata 2282622 workaround to
Bipin Ravi380c1982022-12-22 13:31:46 -0600615 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and
616 r2p1 of the CPU and is still open.
johpow017249fd02022-02-28 18:34:04 -0600617
Boyan Karatotevf8de5352022-10-03 14:21:28 +0100618- ``ERRATA_A710_2291219``: This applies errata 2291219 workaround to
619 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
620 of the CPU and is fixed in r2p1.
621
johpow017d52a8f2022-03-09 16:23:04 -0600622- ``ERRATA_A710_2008768``: This applies errata 2008768 workaround to
623 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
624 of the CPU and is fixed in r2p1.
625
Bipin Ravi77eab292022-07-12 15:53:21 -0500626- ``ERRATA_A710_2371105``: This applies errata 2371105 workaround to
627 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
628 of the CPU and is fixed in r2p1.
629
Sona Mathewc5b386d2023-03-14 16:50:36 -0500630- ``ERRATA_A710_2701952``: This applies erratum 2701952 workaround to Cortex-A710
631 CPU, and applies to system configurations that do not use and ARM
632 interconnect IP. This needs to be enabled for r0p0, r1p0, r2p0 and r2p1 and
633 is still open.
634
Bipin Ravibfa14682023-10-17 07:55:55 -0500635- ``ERRATA_A710_2742423``: This applies errata 2742423 workaround to
636 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and
637 r2p1 of the CPU and is still open.
638
Bipin Ravief9a1552022-12-07 13:32:35 -0600639- ``ERRATA_A710_2768515``: This applies errata 2768515 workaround to
640 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and
641 r2p1 of the CPU and is still open.
642
Sona Mathewe2fea182023-12-08 20:52:17 -0600643- ``ERRATA_A710_2778471``: This applies errata 2778471 workaround to Cortex-A710
644 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
645 CPU and is still open.
646
Bipin Ravieb35e852021-03-30 16:08:32 -0500647For Neoverse N2, the following errata build flags are defined :
648
nayanpatel-arm2f153992021-10-06 15:31:24 -0700649- ``ERRATA_N2_2002655``: This applies errata 2002655 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500650 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
nayanpatel-arm2f153992021-10-06 15:31:24 -0700651
Bipin Ravidd5bc632023-08-29 13:59:09 -0500652- ``ERRATA_N2_2009478``: This applies errata 2009478 workaround to Neoverse-N2
653 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
654
Bipin Ravieb35e852021-03-30 16:08:32 -0500655- ``ERRATA_N2_2067956``: This applies errata 2067956 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500656 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
Bipin Ravieb35e852021-03-30 16:08:32 -0500657
Bipin Ravi7f565472021-03-31 10:10:27 -0500658- ``ERRATA_N2_2025414``: This applies errata 2025414 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500659 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
Bipin Ravi7f565472021-03-31 10:10:27 -0500660
Bipin Ravi7e030692021-08-30 13:02:51 -0500661- ``ERRATA_N2_2189731``: This applies errata 2189731 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500662 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
Bipin Ravi0ba631c2021-09-01 01:36:43 -0500663
664- ``ERRATA_N2_2138956``: This applies errata 2138956 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500665 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
Bipin Ravi7e030692021-08-30 13:02:51 -0500666
nayanpatel-armd4c5f9c2021-09-28 09:46:45 -0700667- ``ERRATA_N2_2138953``: This applies errata 2138953 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500668 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and is still open.
nayanpatel-armd4c5f9c2021-09-28 09:46:45 -0700669
nayanpatel-arm2f153992021-10-06 15:31:24 -0700670- ``ERRATA_N2_2242415``: This applies errata 2242415 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500671 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
nayanpatel-arm2f153992021-10-06 15:31:24 -0700672
nayanpatel-arm8e1aa012021-10-20 18:28:58 -0700673- ``ERRATA_N2_2138958``: This applies errata 2138958 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500674 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
nayanpatel-arm8e1aa012021-10-20 18:28:58 -0700675
nayanpatel-armfed98132021-10-07 17:59:33 -0700676- ``ERRATA_N2_2242400``: This applies errata 2242400 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500677 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
nayanpatel-armfed98132021-10-07 17:59:33 -0700678
nayanpatel-arm45b9f6f2021-10-20 17:30:46 -0700679- ``ERRATA_N2_2280757``: This applies errata 2280757 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500680 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.
nayanpatel-arm45b9f6f2021-10-20 17:30:46 -0700681
Boyan Karatotevd3f8b4d2022-10-03 14:07:08 +0100682- ``ERRATA_N2_2326639``: This applies errata 2326639 workaround to Neoverse-N2
683 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
684 r0p1.
685
Bipin Ravi2997ab92023-10-17 06:21:15 -0500686- ``ERRATA_N2_2340933``: This applies errata 2340933 workaround to Neoverse-N2
687 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
688 r0p1.
689
Bipin Ravi03ba5d82023-10-17 05:56:01 -0500690- ``ERRATA_N2_2346952``: This applies errata 2346952 workaround to Neoverse-N2
691 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2 of the CPU,
692 it is fixed in r0p3.
693
Akram Ahmadb621bda2022-07-18 12:27:29 +0100694- ``ERRATA_N2_2376738``: This applies errata 2376738 workaround to Neoverse-N2
Arvind Ram Prakashf99b7982023-06-29 16:17:23 -0500695 CPU. This needs to be enabled for revision r0p0, r0p1, r0p2, r0p3 and is still open.
Akram Ahmadb621bda2022-07-18 12:27:29 +0100696
Daniel Boulby1af2b112022-07-06 14:33:13 +0100697- ``ERRATA_N2_2388450``: This applies errata 2388450 workaround to Neoverse-N2
698 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
699 r0p1.
700
Arvind Ram Prakash465f93b2023-07-05 17:24:23 -0500701- ``ERRATA_N2_2743014``: This applies errata 2743014 workaround to Neoverse-N2
702 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed
703 in r0p3.
704
Bipin Ravicc744bf2022-12-07 17:01:26 -0600705- ``ERRATA_N2_2743089``: This applies errata 2743089 workaround to Neoverse-N2
706 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed
707 in r0p3.
708
Sona Mathewc5b386d2023-03-14 16:50:36 -0500709- ``ERRATA_N2_2728475``: This applies erratum 2728475 workaround to Neoverse-N2
710 CPU, this erratum affects system configurations that do not use and ARM
711 interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and r0p2.
712 It is fixed in r0p3.
713
Arvind Ram Prakash189622a2023-07-17 14:46:14 -0500714- ``ERRATA_N2_2779511``: This applies errata 2779511 workaround to Neoverse-N2
715 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed
716 in r0p3.
717
johpow0115f10bd2021-12-01 17:40:39 -0600718For Cortex-X2, the following errata build flags are defined :
719
johpow010afef362021-12-02 13:25:50 -0600720- ``ERRATA_X2_2002765``: This applies errata 2002765 workaround to Cortex-X2
721 CPU. This needs to be enabled for revisions r0p0, r1p0, and r2p0 of the CPU,
722 it is still open.
723
johpow01f6c37de2021-12-03 11:27:33 -0600724- ``ERRATA_X2_2058056``: This applies errata 2058056 workaround to Cortex-X2
Sona Mathew414f4e82023-10-16 13:33:18 -0500725 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU,
johpow01f6c37de2021-12-03 11:27:33 -0600726 it is still open.
727
johpow0115f10bd2021-12-01 17:40:39 -0600728- ``ERRATA_X2_2083908``: This applies errata 2083908 workaround to Cortex-X2
729 CPU. This needs to be enabled for revision r2p0 of the CPU, it is still open.
730
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600731- ``ERRATA_X2_2017096``: This applies errata 2017096 workaround to Cortex-X2
732 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
733 CPU, it is fixed in r2p1.
Bipin Ravi2f73d972022-01-20 00:01:04 -0600734
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600735- ``ERRATA_X2_2081180``: This applies errata 2081180 workaround to Cortex-X2
736 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
737 CPU, it is fixed in r2p1.
Bipin Ravi9ad54782022-01-20 00:42:05 -0600738
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600739- ``ERRATA_X2_2216384``: This applies errata 2216384 workaround to Cortex-X2
740 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
741 CPU, it is fixed in r2p1.
Bipin Ravi78b72082022-02-06 01:29:31 -0600742
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600743- ``ERRATA_X2_2147715``: This applies errata 2147715 workaround to Cortex-X2
744 CPU. This needs to be enabled only for revision r2p0 of the CPU, it is fixed
745 in r2p1.
Bipin Ravic6b65212022-03-08 10:37:43 -0600746
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600747- ``ERRATA_X2_2282622``: This applies errata 2282622 workaround to Cortex-X2
748 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
749 CPU and is still open.
Bipin Ravi4e315c32022-07-12 17:13:01 -0500750
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600751- ``ERRATA_X2_2371105``: This applies errata 2371105 workaround to Cortex-X2
752 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU
753 and is fixed in r2p1.
754
Sona Mathewc5b386d2023-03-14 16:50:36 -0500755- ``ERRATA_X2_2701952``: This applies erratum 2701952 workaround to Cortex-X2
756 CPU and affects system configurations that do not use an ARM interconnect IP.
757 This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 and is
758 still open.
759
Bipin Ravi483bc9e2023-10-17 09:11:19 -0500760- ``ERRATA_X2_2742423``: This applies errata 2742423 workaround to Cortex-X2
761 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
762 CPU and is still open.
763
Bipin Ravi7dccf8f2022-12-22 14:19:59 -0600764- ``ERRATA_X2_2768515``: This applies errata 2768515 workaround to Cortex-X2
765 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
766 CPU and is still open.
Bipin Ravi86839eb2022-12-07 13:54:02 -0600767
Sona Mathewc3813332023-12-09 13:09:30 -0600768- ``ERRATA_X2_2778471``: This applies errata 2778471 workaround to Cortex-X2
769 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
770 CPU and it is still open.
771
Boyan Karatotev6559dbd2022-10-03 14:18:28 +0100772For Cortex-X3, the following errata build flags are defined :
773
Sona Mathew35c7d392023-10-03 17:09:09 -0500774- ``ERRATA_X3_2070301``: This applies errata 2070301 workaround to the Cortex-X3
775 CPU. This needs to be enabled only for revisions r0p0, r1p0, r1p1 and r1p2 of
776 the CPU and is still open.
777
Bipin Ravidfa4cf42023-12-20 14:53:37 -0600778- ``ERRATA_X3_2266875``: This applies errata 2266875 workaround to the Cortex-X3
779 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it
780 is fixed in r1p1.
781
Bipin Ravi9cafab82023-12-20 14:32:02 -0600782- ``ERRATA_X3_2302506``: This applies errata 2302506 workaround to the Cortex-X3
783 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1, it is
784 fixed in r1p2.
785
Boyan Karatotev6559dbd2022-10-03 14:18:28 +0100786- ``ERRATA_X3_2313909``: This applies errata 2313909 workaround to
787 Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0
788 of the CPU, it is fixed in r1p1.
789
Harrison Mutai82dd5ac2022-11-11 14:09:55 +0000790- ``ERRATA_X3_2615812``: This applies errata 2615812 workaround to Cortex-X3
791 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the
792 CPU, it is still open.
793
Bipin Ravi42c6eb52024-01-25 15:38:46 -0600794- ``ERRATA_X3_2641945``: This applies errata 2641945 workaround to Cortex-X3
795 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU.
796 It is fixed in r1p1.
797
Sona Mathew95168582023-09-05 14:10:03 -0500798- ``ERRATA_X3_2742421``: This applies errata 2742421 workaround to
799 Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
800 r1p1. It is fixed in r1p2.
801
Harrison Mutai51775542023-12-12 11:17:19 +0000802- ``ERRATA_X3_2743088``: This applies errata 2743088 workaround to Cortex-X3
803 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1. It is
804 fixed in r1p2.
805
Sona Mathew2eab9d02023-11-06 13:48:22 -0600806- ``ERRATA_X3_2779509``: This applies errata 2779509 workaround to Cortex-X3
807 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the
808 CPU. It is fixed in r1p2.
809
johpow01de7b5242022-01-04 16:15:18 -0600810For Cortex-A510, the following errata build flags are defined :
811
812- ``ERRATA_A510_1922240``: This applies errata 1922240 workaround to
813 Cortex-A510 CPU. This needs to be enabled only for revision r0p0, it is
814 fixed in r0p1.
815
johpow0149f60dd2022-01-06 14:54:49 -0600816- ``ERRATA_A510_2288014``: This applies errata 2288014 workaround to
817 Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1,
818 r0p2, r0p3 and r1p0, it is fixed in r1p1.
819
johpow018276f252022-01-07 17:12:31 -0600820- ``ERRATA_A510_2042739``: This applies errata 2042739 workaround to
821 Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1 and
822 r0p2, it is fixed in r0p3.
823
johpow015a993002022-01-11 17:54:41 -0600824- ``ERRATA_A510_2041909``: This applies errata 2041909 workaround to
825 Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is fixed
826 in r0p3. The issue is also present in r0p0 and r0p1 but there is no
827 workaround for those revisions.
828
Sona Mathewd273f762023-10-12 12:04:53 -0500829- ``ERRATA_A510_2080326``: This applies errata 2080326 workaround to
830 Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is
831 fixed in r0p3. This issue is also present in r0p0 and r0p1 but there is no
832 workaround for those revisions.
833
johpow013ba9cb22022-02-13 21:00:10 -0600834- ``ERRATA_A510_2250311``: This applies errata 2250311 workaround to
835 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2,
836 r0p3 and r1p0, it is fixed in r1p1. This workaround disables MPMM even if
837 ENABLE_MPMM=1.
838
johpow013ead2952022-02-14 20:19:08 -0600839- ``ERRATA_A510_2218950``: This applies errata 2218950 workaround to
840 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2,
841 r0p3 and r1p0, it is fixed in r1p1.
842
johpow01ac55c012022-02-15 22:55:22 -0600843- ``ERRATA_A510_2172148``: This applies errata 2172148 workaround to
844 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2,
845 r0p3 and r1p0, it is fixed in r1p1.
846
Harrison Mutaie5249fe2022-12-09 12:14:25 +0000847- ``ERRATA_A510_2347730``: This applies errata 2347730 workaround to
Akram Ahmada85254e2022-07-21 14:01:33 +0100848 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2,
849 r0p3, r1p0 and r1p1. It is fixed in r1p2.
850
Akram Ahmad60accba2022-07-22 16:20:44 +0100851- ``ERRATA_A510_2371937``: This applies errata 2371937 workaround to
852 Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2,
853 r0p3, r1p0, r1p1, and is fixed in r1p2.
854
Akram Ahmad89034d62022-09-21 13:59:56 +0100855- ``ERRATA_A510_2666669``: This applies errata 2666669 workaround to
856 Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2,
857 r0p3, r1p0, r1p1. It is fixed in r1p2.
858
Harrison Mutaie5249fe2022-12-09 12:14:25 +0000859- ``ERRATA_A510_2684597``: This applies erratum 2684597 workaround to
860 Cortex-A510 CPU. This needs to be applied to revision r0p0, r0p1, r0p2,
861 r0p3, r1p0, r1p1 and r1p2. It is fixed in r1p3.
862
Sona Mathew87821142023-12-09 20:44:56 -0600863For Cortex-A520, the following errata build flags are defined :
864
865- ``ERRATA_A520_2630792``: This applies errata 2630792 workaround to
866 Cortex-A520 CPU. This needs to applied for revisions r0p0, r0p1 of the
867 CPU and is still open.
868
Arvind Ram Prakash512c2362023-12-08 20:19:58 -0600869- ``ERRATA_A520_2858100``: This applies errata 2858100 workaround to
870 Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1.
871 It is still open.
872
Sona Mathewc5b386d2023-03-14 16:50:36 -0500873For Cortex-A715, the following errata build flags are defined :
874
875- ``ERRATA_A715_2701951``: This applies erratum 2701951 workaround to Cortex-A715
876 CPU and affects system configurations that do not use an ARM interconnect
877 IP. This needs to be applied to revisions r0p0, r1p0 and r1p1. It is fixed
878 in r1p2.
879
John Tsichritzis4daa1de2018-07-23 09:11:59 +0100880DSU Errata Workarounds
881----------------------
882
883Similar to CPU errata, TF-A also implements workarounds for DSU (DynamIQ
884Shared Unit) errata. The DSU errata details can be found in the respective Arm
885documentation:
886
887- `Arm DSU Software Developers Errata Notice`_.
888
889Each erratum is identified by an ``ID``, as defined in the DSU errata notice
890document. Thus, the build flags which enable/disable the errata workarounds
891have the format ``ERRATA_DSU_<ID>``. The implementation and application logic
892of DSU errata workarounds are similar to `CPU errata workarounds`_.
893
894For DSU errata, the following build flags are defined:
895
Louis Mayencourt4498b152019-04-09 16:29:01 +0100896- ``ERRATA_DSU_798953``: This applies errata 798953 workaround for the
897 affected DSU configurations. This errata applies only for those DSUs that
898 revision is r0p0 (on r0p1 it is fixed). However, please note that this
899 workaround results in increased DSU power consumption on idle.
900
John Tsichritzis4daa1de2018-07-23 09:11:59 +0100901- ``ERRATA_DSU_936184``: This applies errata 936184 workaround for the
902 affected DSU configurations. This errata applies only for those DSUs that
903 contain the ACP interface **and** the DSU revision is older than r2p0 (on
904 r2p0 it is fixed). However, please note that this workaround results in
905 increased DSU power consumption on idle.
906
Bipin Raviaf40d692021-12-22 14:35:21 -0600907- ``ERRATA_DSU_2313941``: This applies errata 2313941 workaround for the
908 affected DSU configurations. This errata applies for those DSUs with
909 revisions r0p0, r1p0, r2p0, r2p1, r3p0, r3p1 and is still open. However,
910 please note that this workaround results in increased DSU power consumption
911 on idle.
912
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100913CPU Specific optimizations
914--------------------------
915
916This section describes some of the optimizations allowed by the CPU micro
917architecture that can be enabled by the platform as desired.
918
919- ``SKIP_A57_L1_FLUSH_PWR_DWN``: This flag enables an optimization in the
920 Cortex-A57 cluster power down sequence by not flushing the Level 1 data
921 cache. The L1 data cache and the L2 unified cache are inclusive. A flush
922 of the L2 by set/way flushes any dirty lines from the L1 as well. This
923 is a known safe deviation from the Cortex-A57 TRM defined power down
924 sequence. Each Cortex-A57 based platform must make its own decision on
925 whether to use the optimization.
926
927- ``A53_DISABLE_NON_TEMPORAL_HINT``: This flag disables the cache non-temporal
928 hint. The LDNP/STNP instructions as implemented on Cortex-A53 do not behave
929 in a way most programmers expect, and will most probably result in a
Dan Handley610e7e12018-03-01 18:44:00 +0000930 significant speed degradation to any code that employs them. The Armv8-A
931 architecture (see Arm DDI 0487A.h, section D3.4.3) allows cores to ignore
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100932 the non-temporal hint and treat LDNP/STNP as LDP/STP instead. Enabling this
933 flag enforces this behaviour. This needs to be enabled only for revisions
934 <= r0p3 of the CPU and is enabled by default.
935
936- ``A57_DISABLE_NON_TEMPORAL_HINT``: This flag has the same behaviour as
937 ``A53_DISABLE_NON_TEMPORAL_HINT`` but for Cortex-A57. This needs to be
938 enabled only for revisions <= r1p2 of the CPU and is enabled by default,
939 as recommended in section "4.7 Non-Temporal Loads/Stores" of the
940 `Cortex-A57 Software Optimization Guide`_.
941
Varun Wadekar5ee3abc2018-06-12 16:49:12 -0700942- ''A57_ENABLE_NON_CACHEABLE_LOAD_FWD'': This flag enables non-cacheable
943 streaming enhancement feature for Cortex-A57 CPUs. Platforms can set
944 this bit only if their memory system meets the requirement that cache
945 line fill requests from the Cortex-A57 processor are atomic. Each
946 Cortex-A57 based platform must make its own decision on whether to use
947 the optimization. This flag is disabled by default.
948
Javier Almansa Sobrino9faad3c2020-10-23 13:22:07 +0100949- ``NEOVERSE_Nx_EXTERNAL_LLC``: This flag indicates that an external last
Manish Pandey3880a362020-01-24 11:54:44 +0000950 level cache(LLC) is present in the system, and that the DataSource field
951 on the master CHI interface indicates when data is returned from the LLC.
952 This is used to control how the LL_CACHE* PMU events count.
Javier Almansa Sobrino9faad3c2020-10-23 13:22:07 +0100953 Default value is 0 (Disabled).
Manish Pandey3880a362020-01-24 11:54:44 +0000954
Manish V Badarkhe173c2962022-05-09 21:55:19 +0100955GIC Errata Workarounds
956----------------------
957- ``GIC600_ERRATA_WA_2384374``: This flag applies part 2 of errata 2384374
958 workaround for the affected GIC600 and GIC600-AE implementations. It applies
959 to implementations of GIC600 and GIC600-AE with revisions less than or equal
960 to r1p6 and r0p2 respectively. If the platform sets GICV3_SUPPORT_GIC600,
961 then this flag is enabled; otherwise, it is 0 (Disabled).
962
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100963--------------
964
Bipin Ravi9cafab82023-12-20 14:32:02 -0600965*Copyright (c) 2014-2024, Arm Limited and Contributors. All rights reserved.*
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100966
John Tsichritzis3eeac412018-09-04 10:56:53 +0100967.. _CVE-2017-5715: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715
968.. _CVE-2018-3639: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639
Bipin Ravi86499742022-01-18 01:59:06 -0600969.. _CVE-2022-23960: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23960
Paul Beesley2437ddc2019-02-08 16:43:05 +0000970.. _Cortex-A53 MPCore Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm048406/index.html
971.. _Cortex-A57 MPCore Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm049219/index.html
Eleanor Bonnicic3b4ca12017-08-02 18:33:41 +0100972.. _Cortex-A72 MPCore Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm012079/index.html
Douglas Raillardd7c21b72017-06-28 15:23:03 +0100973.. _Cortex-A57 Software Optimization Guide: http://infocenter.arm.com/help/topic/com.arm.doc.uan0015b/Cortex_A57_Software_Optimization_Guide_external.pdf
Sandrine Bailleux15530dd2019-02-08 15:26:36 +0100974.. _Arm DSU Software Developers Errata Notice: http://infocenter.arm.com/help/topic/com.arm.doc.epm138168/index.html