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); }
/*