fix(cpus): workaround for Cortex-A715 erratum 2331818
Cortex-A715 erratum 2331818 is a cat B erratum that applies to
revisions r0p0 and r1p0 and is fixed in r1p1. The workaround is to
set bit[20] of CPUACTLR2_EL1. Setting this bit is expected to have
a negligible performance impact.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN2148827/latest
Change-Id: If3b1ed78b145ab6515cdd41135314350ed556381
Signed-off-by: Bipin Ravi <biprav01@u203721.austin.arm.com>
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 416f9ee..6f5f01f 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -881,6 +881,10 @@
For Cortex-A715, the following errata build flags are defined :
+- ``ERRATA_A715_2331818``: This applies errata 2331818 workaround to
+ Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0.
+ It is fixed in r1p1.
+
- ``ERRATA_A715_2420947``: This applies errata 2420947 workaround to
Cortex-A715 CPU. This needs to be enabled only for revision r1p0.
It is fixed in r1p1.