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-rw-r--r--arch/arm/mm/mmu.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 3b5e47dc0c9..e5d61ee3d4a 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -114,6 +114,10 @@ static void __init early_cachepolicy(char **p)
}
if (i == ARRAY_SIZE(cache_policies))
printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n");
+ if (cpu_architecture() >= CPU_ARCH_ARMv6) {
+ printk(KERN_WARNING "Only cachepolicy=writeback supported on ARMv6 and later\n");
+ cachepolicy = CPOLICY_WRITEBACK;
+ }
flush_cache_all();
set_cr(cr_alignment);
}
@@ -252,13 +256,15 @@ static void __init build_mem_type_table(void)
int cpu_arch = cpu_architecture();
int i;
+ if (cpu_arch < CPU_ARCH_ARMv6) {
#if defined(CONFIG_CPU_DCACHE_DISABLE)
- if (cachepolicy > CPOLICY_BUFFERED)
- cachepolicy = CPOLICY_BUFFERED;
+ if (cachepolicy > CPOLICY_BUFFERED)
+ cachepolicy = CPOLICY_BUFFERED;
#elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
- if (cachepolicy > CPOLICY_WRITETHROUGH)
- cachepolicy = CPOLICY_WRITETHROUGH;
+ if (cachepolicy > CPOLICY_WRITETHROUGH)
+ cachepolicy = CPOLICY_WRITETHROUGH;
#endif
+ }
if (cpu_arch < CPU_ARCH_ARMv5) {
if (cachepolicy >= CPOLICY_WRITEALLOC)
cachepolicy = CPOLICY_WRITEBACK;