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[ARM] 3539/1: ixp23xx: fix __arch_ixp23xx_is_coherent() for A1 stepping 

Patch from Lennert Buytenhek

The current __ixp23xx_arch_is_coherent() check assumes that the
lower byte of IXP23XX_PRODUCT_ID is identical to the lower byte of
processor_id, but this is not the case, and because of this we were
incorrectly enabling coherency on A1 stepping CPUs.

Stepping A1 of the ixp2350, which has a PRODUCT_ID of 0x401, has '02'
in the lower byte of processor_id, while A2, with a PRODUCT_ID of
0x402, has '04' in the lower byte of processor_id.

So, to check for >= A2, we really need to check the lower byte of
processor_id against >= 4.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lennert Buytenhek 2006-06-02 19:51:50 +01:00 committed by Russell King
parent ba8f5baba7
commit a77bc69138
1 changed files with 1 additions and 1 deletions
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2
include/asm-arm/arch-ixp23xx/memory.h
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@ -49,7 +49,7 @@ static inline int __ixp23xx_arch_is_coherent(void)
{
extern unsigned int processor_id;
if (((processor_id & 15) >= 2) || machine_is_roadrunner())
if (((processor_id & 15) >= 4) || machine_is_roadrunner())
return 1;
return 0;