[PATCH 0/4] Hacks to allow booting ARM SMP kernel on UP ARMv7
Russell King - ARM Linux
linux at arm.linux.org.uk
Thu Sep 2 09:33:01 EDT 2010
On Thu, Aug 19, 2010 at 10:38:11AM +0300, Tony Lindgren wrote:
> --- a/arch/arm/kernel/head.S
> +++ b/arch/arm/kernel/head.S
> @@ -346,8 +346,10 @@ __fixup_smp:
> bne smp_on_up @ no, assume UP
> mrc p15, 0, r0, c0, c0, 5 @ read MIDR
> movs r0, r0, lsr #30
> - teqne r0, #3 @ check top two bits 00 or 11
> - moveq pc, lr
> + teq r0, #0 @ check two top bits 00
> + beq smp_on_up @ yes, assume UP
> + teq r0, #3 @ check top two bits 11
> + movne pc, lr @ no, running on SMP hw
This should be:
movs r0, r0, lsr #30
teqne r0, #3
movne pc, lr
so that 0 or 3 avoids the return.
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