On 05/15/13 12:38, Stephen Boyd wrote: > On 05/08/13 14:47, Stephen Boyd wrote: >> From: Brian Swetland <swetland@xxxxxxxxxx> >> >> Currently v7 CPUs with an MIDR that has no bits set in the range >> [16:12] will be detected as old ARM CPUs with no caches and so >> the cache will never be turned on during decompression. ARM's >> Cortex chips have an 0xC in the range [16:12] so they never match >> this entry, but Qualcomm's Scorpion and Krait processors never >> set these bits to anything besides 0 so they always match. >> >> Skip this entry if we've compiled in support for v7 CPUs. This >> allows kernel decompression to happen nearly instantly instead of >> taking over 20 seconds. >> >> Signed-off-by: Brian Swetland <swetland@xxxxxxxxxx> >> [sboyd: Clarified and extended commit text] >> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> >> --- > Ping? Russell, shall I add this to the patch tracker? > >> arch/arm/boot/compressed/head.S | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S >> index fe4d9c3..a236190 100644 >> --- a/arch/arm/boot/compressed/head.S >> +++ b/arch/arm/boot/compressed/head.S >> @@ -805,6 +805,8 @@ call_cache_fn: adr r12, proc_types >> .align 2 >> .type proc_types,#object >> proc_types: >> +#if !defined(CONFIG_CPU_V7) >> + /* This collides with some V7 IDs, preventing correct detection */ >> .word 0x00000000 @ old ARM ID >> .word 0x0000f000 >> mov pc, lr >> @@ -813,6 +815,7 @@ proc_types: >> THUMB( nop ) >> mov pc, lr >> THUMB( nop ) >> +#endif >> >> .word 0x41007000 @ ARM7/710 >> .word 0xfff8fe00 > -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
