fix(cpus): workaround for Cortex-X2 erratum 1916945
Cortex-X2 erratum 1916945 is a Cat B erratum that applies to
revisions r0p0 and r1p0 and is fixed in r2p0.
The workaround is to set CPUECTLR_EL1[8]. This has a small
performance impact (<0.5%).
SDEN documentation:
https://developer.arm.com/documentation/SDEN-1775100/latest
Change-Id: If810b1d0a07c43b3e1aa70d2ec88c1dcfa6f735f
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 9978202..9c55077 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -744,6 +744,10 @@
- ``ERRATA_X2_1901946``: This applies errata 1901946 workaround to Cortex-X2
CPU. This needs to be enabled only for r1p0, it is fixed in r2p0.
+- ``ERRATA_X2_1916945``: This applies errata 1916945 workaround to Cortex-X2
+ CPU. This needs to be enabled for revisions r0p0 and r1p0, it is fixed in
+ r2p0.
+
- ``ERRATA_X2_2002765``: This applies errata 2002765 workaround to Cortex-X2
CPU. This needs to be enabled for revisions r0p0, r1p0, and r2p0 of the CPU,
it is still open.