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| author | Tigran Tadevosyan <tigran.tadevosyan@arm.com> | 2019-04-05 15:16:13 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-04-23 18:28:37 +0200 |
| commit | c3143967807adb1357c36b68a7563fc0c4e1f615 (patch) | |
| tree | 366d4c17a8d55bf9c4830fd67630c4f7b9dc7016 | |
| parent | ARM: fix function graph tracer and unwinder dependencies (diff) | |
| download | linux-c3143967807adb1357c36b68a7563fc0c4e1f615.tar.xz linux-c3143967807adb1357c36b68a7563fc0c4e1f615.zip | |
ARM: 8856/1: NOMMU: Fix CCR register faulty initialization when MPU is disabled
When CONFIG_ARM_MPU is not defined, the base address of v7M SCB register
is not initialized with correct value. This prevents enabling I/D caches
when the L1 cache poilcy is applied in kernel.
Fixes: 3c24121039c9da14692eb48f6e39565b28c0f3cf ("ARM: 8756/1: NOMMU: Postpone MPU activation till __after_proc_init")
Signed-off-by: Tigran Tadevosyan <tigran.tadevosyan@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | arch/arm/kernel/head-nommu.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index c08d2d890f7b..b38bbd011b35 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -133,9 +133,9 @@ __secondary_data: */ .text __after_proc_init: -#ifdef CONFIG_ARM_MPU M_CLASS(movw r12, #:lower16:BASEADDR_V7M_SCB) M_CLASS(movt r12, #:upper16:BASEADDR_V7M_SCB) +#ifdef CONFIG_ARM_MPU M_CLASS(ldr r3, [r12, 0x50]) AR_CLASS(mrc p15, 0, r3, c0, c1, 4) @ Read ID_MMFR0 and r3, r3, #(MMFR0_PMSA) @ PMSA field |