ARM errata 852421 and 852423 applies to r1p0, r1p1 and r1p2
revisions of Cortex-A17 processors. These workarounds
exist in Linux kernel and I thought it would be better
to add them in to U-Boot.
Signed-off-by: Nisal Menuka <nisalmenuk...@gmail.com>
---
arch/arm/Kconfig | 6 ++++++
arch/arm/cpu/armv7/start.S | 12 ++++++++++++
2 files changed, 18 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 42f93b4..f7b60f6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -88,6 +88,12 @@ config ARM_ERRATA_833069
config ARM_ERRATA_833471
bool
+config ARM_ERRATA_852421
+ bool
+
+config ARM_ERRATA_852423
+ bool
+
config CPU_ARM720T
bool
select SYS_CACHE_SHIFT_5
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 1a6aee9..f06fd28 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -283,6 +283,18 @@ skip_errata_621766:
skip_errata_725233:
#endif
+#ifdef CONFIG_ARM_ERRATA_852421
+ mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
+ orr r0, r0, #1 << 24 @ set bit #24
+ mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
+#endif
+
+#ifdef CONFIG_ARM_ERRATA_852423
+ mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
+ orr r0, r0, #1 << 12 @ set bit #12
+ mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
+#endif
+
mov pc, r5 @ back to my caller
ENDPROC(cpu_init_cp15)
--
2.7.4
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