fix(cpus): workaround for Cortex-A710 erratum 1916945
Cortex-A710 erratum 1916945 is a Cat B erratum that applies
to revisions r0p0 and r1p0 and is fixed in r2p0.
The workaround is to set CPUECTLR_EL1[8]. This has a slight
performance impact.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1775101
Change-Id: I54793492c527928d7f266165a31b8613de838e69
Signed-off-by: John Powell <john.powell@arm.com>
diff --git a/lib/cpus/aarch64/cortex_a710.S b/lib/cpus/aarch64/cortex_a710.S
index e8bf453..7370644 100644
--- a/lib/cpus/aarch64/cortex_a710.S
+++ b/lib/cpus/aarch64/cortex_a710.S
@@ -37,6 +37,12 @@
check_erratum_range cortex_a710, ERRATUM(1901946), CPU_REV(1, 0), CPU_REV(1, 0)
+workaround_reset_start cortex_a710, ERRATUM(1916945), ERRATA_A710_1916945
+ sysreg_bit_set CORTEX_A710_CPUECTLR_EL1, BIT(8)
+workaround_reset_end cortex_a710, ERRATUM(1916945)
+
+check_erratum_ls cortex_a710, ERRATUM(1916945), CPU_REV(1, 0)
+
workaround_reset_start cortex_a710, ERRATUM(1987031), ERRATA_A710_1987031
ldr x0,=0x6
msr S3_6_c15_c8_0,x0
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 861059d..36050c3 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -565,6 +565,10 @@
# to revision r1p0 and is fixed in r2p0.
CPU_FLAG_LIST += ERRATA_A710_1901946
+# Flag to apply erratum 1916945 workaround during reset. This erratum applies
+# to revisions r0p0 and r1p0 of the Cortex-A710 CPU and is fixed in r2p0.
+CPU_FLAG_LIST += ERRATA_A710_1916945
+
# Flag to apply erratum 1987031 workaround during reset. This erratum applies
# to revisions r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is still open.
CPU_FLAG_LIST += ERRATA_A710_1987031