fix(cpus): workaround for Neoverse-N2 erratum 2388450
Neoverse-N2 erratum 2388450 is a cat B erratum that applies to
revision r0p0 and is fixed in r0p1. The workaround is to set
bit[40] of CPUACTLR2_EL1 to disable folding of demand requests into
older prefetches with L2 miss requests outstanding.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest
Change-Id: I6dd949c79cea8dbad322e569aa5de86cf8cf9639
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 6d49dab..5eecdd6 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -556,6 +556,10 @@
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2280757 ?=0
+# Flag to apply erratum 2388450 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu, it is fixed in r0p1.
+ERRATA_N2_2388450 ?=0
+
# Flag to apply erratum 2002765 workaround during reset. This erratum applies
# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
ERRATA_X2_2002765 ?=0
@@ -1103,6 +1107,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2280757))
$(eval $(call add_define,ERRATA_N2_2280757))
+# Process ERRATA_N2_2388450 flag
+$(eval $(call assert_boolean,ERRATA_N2_2388450))
+$(eval $(call add_define,ERRATA_N2_2388450))
+
# Process ERRATA_X2_2002765 flag
$(eval $(call assert_boolean,ERRATA_X2_2002765))
$(eval $(call add_define,ERRATA_X2_2002765))