Workaround for Neoverse N1 erratum 1800710
Neoverse N1 erratum 1800710 is a Cat B erratum, present in older
revisions of the Neoverse N1 processor core. The workaround is to
set a bit in the ECTLR_EL1 system register, which disables allocation
of splintered pages in the L2 TLB.
This errata is explained in this SDEN:
https://static.docs.arm.com/sden885747/f/Arm_Neoverse_N1_MP050_Software_Developer_Errata_Notice_v21.pdf
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ie5b15c8bc3235e474a06a57c3ec70684361857a6
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index e494375..3c895f5 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -314,6 +314,10 @@
# to revisions r3p0 - r4p0 of the Neoverse N1 cpu.
ERRATA_N1_1542419 ?=0
+# Flag to apply erratum 1800710 workaround during reset. This erratum applies
+# to revisions <= r4p0 of the Neoverse N1 cpu.
+ERRATA_N1_1800710 ?=0
+
# Flag to apply DSU erratum 798953. This erratum applies to DSUs revision r0p0.
# Applying the workaround results in higher DSU power consumption on idle.
ERRATA_DSU_798953 ?=0
@@ -563,6 +567,10 @@
$(eval $(call assert_boolean,ERRATA_N1_1542419))
$(eval $(call add_define,ERRATA_N1_1542419))
+# Process ERRATA_N1_1800710 flag
+$(eval $(call assert_boolean,ERRATA_N1_1800710))
+$(eval $(call add_define,ERRATA_N1_1800710))
+
# Process ERRATA_DSU_798953 flag
$(eval $(call assert_boolean,ERRATA_DSU_798953))
$(eval $(call add_define,ERRATA_DSU_798953))