errata: workaround for Neoverse N2 erratum 2189731
Neoverse N2 erratum 2189731 is a Cat B erratum that applies to
revision r0p0 and is still open. The workaround is to set
CPUACTLR5_EL1[44] to 1 which will cause the CPP instruction to
invalidate the hardware prefetcher state trained from any EL.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: Iddc6a59adf9fa3cab560c46f2133e1f5a8b3ad03
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index a630526..e0fc1f7 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -429,6 +429,10 @@
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2025414 ?=0
+# Flag to apply erratum 2189731 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu and is still open.
+ERRATA_N2_2189731 ?=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
@@ -798,6 +802,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2025414))
$(eval $(call add_define,ERRATA_N2_2025414))
+# Process ERRATA_N2_2189731 flag
+$(eval $(call assert_boolean,ERRATA_N2_2189731))
+$(eval $(call add_define,ERRATA_N2_2189731))
+
# Process ERRATA_A710_2055002 flag
$(eval $(call assert_boolean,ERRATA_A710_2055002))
$(eval $(call add_define,ERRATA_A710_2055002))