fix(errata): workaround for Cortex X2 erratum 2058056
Cortex X2 erratum 2058056 is a Cat B erratum present in the X2 core.
It applies to revisions r0p0, r1p0, and r2p0 and is still open.
There are 2 ways this workaround can be accomplished, the first of
which involves executing a few additional instructions around MSR
writes to CPUECTLR when disabling the prefetcher. (see SDEN for
details)
However, this patch implements the 2nd possible workaround which sets
the prefetcher into its most conservative mode, since this workaround
is generic.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1775100
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Idb20d9928c986616cd5bedf40bb29d46d384cfd3
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 98c78cd..dd06cb8 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -499,6 +499,10 @@
# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
ERRATA_X2_2002765 ?=0
+# Flag to apply erratum 2058056 workaround during reset. This erratum applies
+# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
+ERRATA_X2_2058056 ?=0
+
# Flag to apply erratum 2083908 workaround during reset. This erratum applies
# to revision r2p0 of the Cortex-X2 cpu and is still open.
ERRATA_X2_2083908 ?=0
@@ -932,6 +936,10 @@
$(eval $(call assert_boolean,ERRATA_X2_2002765))
$(eval $(call add_define,ERRATA_X2_2002765))
+# Process ERRATA_X2_2058056 flag
+$(eval $(call assert_boolean,ERRATA_X2_2058056))
+$(eval $(call add_define,ERRATA_X2_2058056))
+
# Process ERRATA_X2_2083908 flag
$(eval $(call assert_boolean,ERRATA_X2_2083908))
$(eval $(call add_define,ERRATA_X2_2083908))