fix(errata): workaround for Neoverse-N2 erratum 2280757
Neoverse-N2 erratum 2280757 is a Cat B erratum that applies to
revision r0p0 of CPU. It is still open. The workaround
is to set CPUACTLR_EL1[22] to 1'b1. Setting CPUACTLR_EL1[22]
will cause CFP instruction to invalidate all branch predictor
resources regardless of context.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest
Signed-off-by: nayanpatel-arm <nayankumar.patel@arm.com>
Change-Id: I615bcc1f993c45659b8b6f1a34fca0eb490f8add
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index f0da139..cdb978b 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -473,6 +473,10 @@
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2242400 ?=0
+# Flag to apply erratum 2280757 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu and is still open.
+ERRATA_N2_2280757 ?=0
+
# Flag to apply erratum 2055002 workaround during reset. This erratum applies
# to revision r1p0, r2p0 of the Cortex-A710 cpu and is still open.
ERRATA_A710_2055002 ?=0
@@ -886,6 +890,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2242400))
$(eval $(call add_define,ERRATA_N2_2242400))
+# Process ERRATA_N2_2280757 flag
+$(eval $(call assert_boolean,ERRATA_N2_2280757))
+$(eval $(call add_define,ERRATA_N2_2280757))
+
# Process ERRATA_A710_2055002 flag
$(eval $(call assert_boolean,ERRATA_A710_2055002))
$(eval $(call add_define,ERRATA_A710_2055002))