Workaround for Cortex A77 erratum 1925769
Cortex A77 erratum 1925769 is a Cat B erratum, present in older
revisions of the Cortex A77 processor core. The workaround is to
set bit 8 in the ECTLR_EL1 register, there is a small performance cost
(<0.5%) for setting this bit.
SDEN can be found here:
https://documentation-service.arm.com/static/5f7c35d0d3be967f7be46d33
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I9cf0e0b5dc1e3e32e24279d2632c759cc7bd7ce9
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 925ed5f..1210538 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -290,6 +290,10 @@
# only to revision <= r1p1 of the Cortex A77 cpu.
ERRATA_A77_1800714 ?=0
+# Flag to apply erratum 1925769 workaround during reset. This erratum applies
+# only to revision <= r1p1 of the Cortex A77 cpu.
+ERRATA_A77_1925769 ?=0
+
# Flag to apply erratum 1688305 workaround during reset. This erratum applies
# to revisions r0p0 - r1p0 of the A78 cpu.
ERRATA_A78_1688305 ?=0
@@ -571,6 +575,10 @@
$(eval $(call assert_boolean,ERRATA_A77_1800714))
$(eval $(call add_define,ERRATA_A77_1800714))
+# Process ERRATA_A77_1925769 flag
+$(eval $(call assert_boolean,ERRATA_A77_1925769))
+$(eval $(call add_define,ERRATA_A77_1925769))
+
# Process ERRATA_A78_1688305 flag
$(eval $(call assert_boolean,ERRATA_A78_1688305))
$(eval $(call add_define,ERRATA_A78_1688305))