[PATCH] ARM errata: Possible cache data corruption with hit-under-miss enabled

[Siarhei Siamashka]

On Mon, Aug 8, 2011 at 4:26 PM, Catalin Marinas <catalin.marinas at arm.com> wrote:
> On Mon, Aug 08, 2011 at 12:43:00PM +0100, Siarhei Siamashka wrote:
>> On Mon, Aug 8, 2011 at 1:02 PM, Catalin Marinas <catalin.marinas at arm.com> wrote:
>> > On Mon, Aug 08, 2011 at 07:32:28AM +0100, Siarhei Siamashka wrote:
>> >> From: Catalin Marinas <catalin.marinas at arm.com>
>> >>
>> >> This patch is a workaround for the 364296 ARM1136 r0pX erratum (possible
>> >> cache data corruption with hit-under-miss enabled). It sets the
>> >> undocumented bit 31 in the auxiliary control register and the FI bit in
>> >> the control register, thus disabling hit-under-miss without putting the
>> >> processor into full low interrupt latency mode.
>> >>
>> >> Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
>> >> Tested-by: Siarhei Siamashka <siarhei.siamashka at gmail.com>
>> >
>> > I haven't pushed this workaround in the past as I wasn't sure there is
>> > production hardware affected. I recall you mentioned Nokia N800, do you
>> > know which CPU revision does this have?
>>
>> [    0.000000] CPU: ARMv6-compatible processor [4107b362] revision 2
>> (ARMv6TEJ), cr=00e5387f
>> [    0.000000] CPU: VIPT aliasing data cache, unknown instruction
>> cache
>> [    0.000000] Machine: Nokia N810
>> [    0.000000] Memory policy: ECC disabled, Data cache writeback
>> [    0.000000] OMAP2420
>>
>> # cat /proc/cpuinfo
>> Processor       : ARMv6-compatible processor rev 2 (v6l)
>> BogoMIPS        : 213.72
>> Features        : swp half thumb fastmult vfp edsp java
>> CPU implementer : 0x41
>> CPU architecture: 6TEJ
>> CPU variant     : 0x0
>> CPU part        : 0xb36
>> CPU revision    : 2
>>
>> Hardware        : Nokia N810
>> Revision        : 0000
>> Serial          : 0000000000000000
> ...
>> Would you be so kind to update the patch?
>
> OK, I'll update it and post the patch in the next day or so.

Thanks a lot. I'll be sure to test it and respond to confirm that it
works fine (or not).

-- 
Best regards,
Siarhei Siamashka