[U-Boot] [PATCH] ARMv8: Bug fix of dcache_disable()

fenghua at phytium.com.cn
2015-02-09T08:51:59Z

From: David Feng <fenghua@phytium.com.cn>

The cache disable operation shoud be performed after flush_dcache_all().
If cache disable operation is performed before
flush_dcache_all(), flush_dcache_all() store data directly to memory
and may be overrided by data copy in cache.

Signed-off-by: David Feng <fenghua@phytium.com.cn>
---
arch/arm/cpu/armv8/cache_v8.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index 9dbcdf2..dc2fc8c 100644
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -124,9 +124,10 @@ void dcache_disable(void)
if (!(sctlr & CR_C))
return;

+ flush_dcache_all();
+
set_sctlr(sctlr & ~(CR_C|CR_M));

- flush_dcache_all();
__asm_invalidate_tlb_all();
}

--
1.7.9.5