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ARM: Add workaround for Cortex-A9 errata 761320

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Full cache line writes to the same memory region from at least two
processors might deadlock the processor. Exists on r1, r2, r3
revisions.

Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
Acked-by: Fabio Estevam <fabio.estevam@freescale.com>
This commit is contained in:
Nitin Garg 2014-04-02 08:55:02 -05:00 • committed by Stefano Babic
parent f71cbfe3ca
commit b7588e3bdc
2 changed files with 6 additions and 0 deletions
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1
README
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@ -567,6 +567,7 @@ The following options need to be configured:
CONFIG_ARM_ERRATA_743622 CONFIG_ARM_ERRATA_743622
CONFIG_ARM_ERRATA_751472 CONFIG_ARM_ERRATA_751472
CONFIG_ARM_ERRATA_794072 CONFIG_ARM_ERRATA_794072
CONFIG_ARM_ERRATA_761320
If set, the workarounds for these ARM errata are applied early If set, the workarounds for these ARM errata are applied early
during U-Boot startup. Note that these options force the during U-Boot startup. Note that these options force the

5
arch/arm/cpu/armv7/start.S
View file

@ -222,6 +222,11 @@ ENTRY(cpu_init_cp15)
orr r0, r0, #1 << 11 @ set bit #11 orr r0, r0, #1 << 11 @ set bit #11
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
#endif #endif
#ifdef CONFIG_ARM_ERRATA_761320
mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
orr r0, r0, #1 << 21 @ set bit #21
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
#endif
mov pc, lr @ back to my caller mov pc, lr @ back to my caller
ENDPROC(cpu_init_cp15) ENDPROC(cpu_init_cp15)