fix(cpus): workaround for Cortex-A710 erratum 1901946
Cortex-A710 erratum 1901946 is a Cat B erratum that applies
to revision r1p0 and is fixed in r2p0.
The workaround is to set CPUACTLR4_EL1[15]. This has a slight
performance impact.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1775101
Change-Id: I703f0e6ee122e44a9bc284d90f1465039e3b40e4
Signed-off-by: John Powell <john.powell@arm.com>
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 117372f..8a99a58 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -573,6 +573,10 @@
For Cortex-A710, the following errata build flags are defined :
+- ``ERRATA_A710_1901946``: This applies errata 1901946 workaround to
+ Cortex-A710 CPU. This needs to be enabled only for revision r1p0. It has
+ been fixed in r2p0.
+
- ``ERRATA_A710_1987031``: This applies errata 1987031 workaround to
Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
r2p0 of the CPU. It is still open.