Neovers N1: added support to update presence of External LLC
CPUECTLR_EL1.EXTLLC bit indicates the presense of internal or external
last level cache(LLC) in the system, the reset value is internal LLC.
To cater for the platforms(like N1SDP) which has external LLC present
introduce a new build option 'NEOVERSE_N1_EXTERNAL_LLC' which can be
enabled by platform port.
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ibf475fcd6fd44401897a71600f4eafe989921363
diff --git a/lib/cpus/aarch64/neoverse_n1.S b/lib/cpus/aarch64/neoverse_n1.S
index d058d98..d537ed6 100644
--- a/lib/cpus/aarch64/neoverse_n1.S
+++ b/lib/cpus/aarch64/neoverse_n1.S
@@ -465,6 +465,13 @@
msr CPUAMCNTENSET_EL0, x0
#endif
+#if NEOVERSE_N1_EXTERNAL_LLC
+ /* Some system may have External LLC, core needs to be made aware */
+ mrs x0, NEOVERSE_N1_CPUECTLR_EL1
+ orr x0, x0, NEOVERSE_N1_CPUECTLR_EL1_EXTLLC_BIT
+ msr NEOVERSE_N1_CPUECTLR_EL1, x0
+#endif
+
#if ERRATA_DSU_936184
bl errata_dsu_936184_wa
#endif