errata: workaround for Neoverse N2 erratum 2138956
Neoverse N2 erratum 2138956 is a Cat B erratum that applies to
revision r0p0 and is still open. This erratum can be avoided by
inserting a sequence of 16 DMB ST instructions prior to WFI or WFE.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I1aac87b3075992f875451e4767b21857f596d0b2
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index e0fc1f7..584682e 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -433,6 +433,10 @@
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2189731 ?=0
+# Flag to apply erratum 2138956 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu and is still open.
+ERRATA_N2_2138956 ?=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
@@ -806,6 +810,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2189731))
$(eval $(call add_define,ERRATA_N2_2189731))
+# Process ERRATA_N2_2138956 flag
+$(eval $(call assert_boolean,ERRATA_N2_2138956))
+$(eval $(call add_define,ERRATA_N2_2138956))
+
# Process ERRATA_A710_2055002 flag
$(eval $(call assert_boolean,ERRATA_A710_2055002))
$(eval $(call add_define,ERRATA_A710_2055002))