Add ARM errata workaround 852421 and 852423 for Cortex-A17

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 <nisalmenuka23@gmail.com>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 08480ac..054ccac 100644 (file)
--- 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 (file)
--- 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)