diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 390aa92ef04d..7b7d95c84641 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S | |||
| @@ -396,12 +396,18 @@ __armv3_mpu_cache_on: | |||
| 396 | 396 | ||
| 397 | mov r0, #0 | 397 | mov r0, #0 |
| 398 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | 398 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 |
| 399 | /* | ||
| 400 | * ?? ARMv3 MMU does not allow reading the control register, | ||
| 401 | * does this really work on ARMv3 MPU? | ||
| 402 | */ | ||
| 399 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | 403 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
| 400 | @ .... .... .... WC.M | 404 | @ .... .... .... WC.M |
| 401 | orr r0, r0, #0x000d @ .... .... .... 11.1 | 405 | orr r0, r0, #0x000d @ .... .... .... 11.1 |
| 406 | /* ?? this overwrites the value constructed above? */ | ||
| 402 | mov r0, #0 | 407 | mov r0, #0 |
| 403 | mcr p15, 0, r0, c1, c0, 0 @ write control reg | 408 | mcr p15, 0, r0, c1, c0, 0 @ write control reg |
| 404 | 409 | ||
| 410 | /* ?? invalidate for the second time? */ | ||
| 405 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 | 411 | mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3 |
| 406 | mov pc, lr | 412 | mov pc, lr |
| 407 | 413 | ||