feat(cpus): workaround for Cortex A78 AE erratum 1941500
Cortex A78 AE erratum 1941500 is a Cat B erratum that applies
to revisions <= r0p1. It is still open.
This erratum is avoided by by setting CPUECTLR_EL1[8] to 1.
There is a small performance cost (<0.5%) for setting this
bit.
SDEN is available at https://developer.arm.com/documentation/SDEN1707912/0900
Change-Id: I2d72666468b146714a0340ba114ccf0f5165b39c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 0a0d2f0..2dfaf78 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -283,6 +283,10 @@
For Cortex-A78 AE, the following errata build flags are defined :
+- ``ERRATA_A78_AE_1941500`` : This applies errata 1941500 workaround to Cortex-A78
+ AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This erratum is
+ still open.
+
- ``ERRATA_A78_AE_1951502`` : This applies errata 1951502 workaround to Cortex-A78
AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This erratum is
still open.