From 7710cc691cfc5ad457173944d989875a6e79d238 Mon Sep 17 00:00:00 2001 From: Vladimir Murzin Date: Fri, 1 Dec 2017 10:19:11 +0100 Subject: ARM: 8732/1: NOMMU: Allow userspace to access background MPU region Currently, with MPU enabled, we prohibit userspace access to anything except RAM. Benjamin, reported that because of that his userspace application cannot access framebuffer's memory he reserved in device tree. It turns out we have no option other than to allow userspace access memory covered by background region. Reported-by: Benjamin Gaignard Tested-by: Benjamin Gaignard Signed-off-by: Vladimir Murzin Signed-off-by: Russell King --- arch/arm/mm/pmsa-v7.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm/mm') diff --git a/arch/arm/mm/pmsa-v7.c b/arch/arm/mm/pmsa-v7.c index 976df60ac426..650998912c1c 100644 --- a/arch/arm/mm/pmsa-v7.c +++ b/arch/arm/mm/pmsa-v7.c @@ -433,7 +433,7 @@ void __init mpu_setup(void) /* Background */ err |= mpu_setup_region(region++, 0, 32, - MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0NA, + MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0RW, 0, false); #ifdef CONFIG_XIP_KERNEL -- cgit v1.2.3