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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>
This commit is contained in:
Nisal Menuka 2017-04-26 16:18:01 -05:00 committed by Tom Rini
parent d5c16d0093
commit 8776350d87
2 changed files with 18 additions and 0 deletions
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6
arch/arm/Kconfig
View File

@ -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

12
arch/arm/cpu/armv7/start.S
View File

@ -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)