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 --- 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)