[PATCH 1/3] ARM: MM: Add the workaround of Errata 774769
From: Russell King - ARM Linux <hidden>
Date: 2012-12-10 00:08:42
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On Mon, Dec 10, 2012 at 08:58:35AM +0900, Boojin Kim wrote:
-3: mov r10, #0 + /* Cortex-A15 Errata */ +3: ldr r10, =0x00000c0f @ Cortex-A15 primary part number + teq r0, r10 + bne 4f +#ifdef CONFIG_ARM_ERRATA_774769
There's not much point testing for the part number of the work-around isn't enabled.
+ teq r6, #0x4 @ present in r0p4 + mrceq p15, 0, r10, c1, c0, 1 @ read aux control register
tsteq r10, #1 << 15 to avoid writing to the aux control register if the errata has already been applied.
+ orreq r10, r10, #1 << 25 @ set bit #25 + mcreq p15, 0, r10, c1, c0, 1 @ write aux control register +#endif + +4: mov r10, #0 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate dsb #ifdef CONFIG_MMU -- 1.7.5.4