fix(cpus): workaround for Cortex-A78 erratum 2779479
Cortex-A78 erratum 2779479 is a Cat B erratum that applies to
all revisions <= r1p2 and is still open.
The workaround is to set the CPUACTLR3_EL1[47] bit to 1. Setting this
bit might have a small impact on power and negligible impact
on performance.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1401784/latest
Change-Id: I3779fd1eff3017c5961ffa101b357918070b3b36
Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index c9b4447..ae6baa7 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -362,6 +362,10 @@
# open.
ERRATA_A78_2772019 ?=0
+# Flag to apply erratum 2779479 workaround during reset. This erratum applies
+# to revision r0p0, r1p0, r1p1 and r1p2 of the A78 cpu. It is still open.
+ERRATA_A78_2779479 ?=0
+
# Flag to apply erratum 1941500 workaround during reset. This erratum applies
# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
ERRATA_A78_AE_1941500 ?=0
@@ -1030,6 +1034,10 @@
$(eval $(call assert_boolean,ERRATA_A78_2772019))
$(eval $(call add_define,ERRATA_A78_2772019))
+# Process ERRATA_A78_2779479 flag
+$(eval $(call assert_boolean,ERRATA_A78_2779479))
+$(eval $(call add_define,ERRATA_A78_2779479))
+
# Process ERRATA_A78_AE_1941500 flag
$(eval $(call assert_boolean,ERRATA_A78_AE_1941500))
$(eval $(call add_define,ERRATA_A78_AE_1941500))