Re: [U-Boot] [PATCH] Add ARM errata workaround 852421 and 852423 for Cortex-A17

On Sun, Apr 16, 2017 at 7:50 PM, Nisal Menuka nisalmenuka23@gmail.com wrote:

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/cpu/armv7/start.S | 12 ++++++++++++ 1 file changed, 12 insertions(+)

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

No entries to arch/arm/Kconfig ?