[U-Boot] [PATCH v5 1/5] mips: implement to access the KSEG0/1 memory range in map_physmem
Antony Pavlov
antonynpavlov at gmail.com
Tue Dec 29 13:49:58 CET 2015
On Tue, 29 Dec 2015 19:17:09 +0800
Wills Wang <wills.wang at live.com> 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 at live.com>
> ---
>
> Changes in v5: None
> 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)
> #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
This 'else' is redundant here.
> + return (void *)KSEG0ADDR(paddr);
> }
>
> /*
> --
> 1.9.1
>
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--
--
Best regards,
Antony Pavlov
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