On Friday, December 25, 2015 at 07:56:22 PM, 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 v4: None Changes in v3: None Changes in v2: None
arch/mips/include/asm/io.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index a7ab087..943053d 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)
I _think_ this is something someone familiar with mips has to review, since I think this has a potential to break a lot of machines.
#define MAP_WRCOMBINE (0) #define MAP_WRBACK (0) #define MAP_WRTHROUGH (0) @@ -493,7 +493,10 @@ 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);- else
return (void *)KSEG0ADDR(paddr);}
/*
Best regards, Marek Vasut