On 01/05/2016 10:45 AM, Thomas Chou wrote:
Hi Wills,
On 2016年01月04日 19:14, Wills Wang wrote:
U-boot just use the no MMU virtual address segment(KSEG0/1), this patch enable access the uncached memory range(KSEG1) by flag "MAP_NOCACHE", other flag for KSEG0 access.
Signed-off-by: Wills Wang wills.wang@live.com
Changes in v6:
- Remove useless "else"
Changes in v5: None Changes in v4: None Changes in v3: None Changes in v2: None
arch/mips/include/asm/io.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index a7ab087..77353e5 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -485,7 +485,7 @@ static inline void sync(void)
- that can be used to access the memory range with the caching
- properties specified by "flags".
*/ -#define MAP_NOCACHE (0) +#define MAP_NOCACHE (1) #define MAP_WRCOMBINE (0) #define MAP_WRBACK (0) #define MAP_WRTHROUGH (0) @@ -493,7 +493,9 @@ static inline void sync(void) static inline void * map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) {
- return (void *)paddr;
if (flags)
return (void *)KSEG1ADDR(paddr);return (void *)KSEG0ADDR(paddr); }
/*
But Daniel has suggested CKSEG1ADDR() instead. :)
I'm so sorry, i missed Daniel's email. I will correct in the next patch. Thomas, thank you for reminding me, or i lost an important information.
Best regards, Thomas