diff options
| author | Haavard Skinnemoen <haavard.skinnemoen@atmel.com> | 2010-08-12 13:52:54 +0700 |
|---|---|---|
| committer | Reinhard Meyer <u-boot@emk-elektronik.de> | 2010-09-03 15:13:02 +0200 |
| commit | 1f36f73fe70560a2bd286a7abc8530fdc93af9ae (patch) | |
| tree | 23ba61ced5254af43107e7d0de5b25b566ac78bb /arch/avr32/include/asm/arch-at32ap700x/addrspace.h | |
| parent | 9cec2fc209a000655af77256a39ede7c7d441e56 (diff) | |
avr32: Add simple paging support
Use the MMU hardware to set up 1:1 mappings between physical and virtual
addresses. This allows us to bypass the cache when accessing the flash
without having to do any physical-to-virtual address mapping in the CFI
driver.
The virtual memory mappings are defined at compile time through a sorted
array of virtual memory range objects. When a TLB miss exception
happens, the exception handler does a binary search through the array
until it finds a matching entry and loads it into the TLB. The u-boot
image itself is covered by a fixed TLB entry which is never replaced.
This makes the 'saveenv' command work again on ATNGW100 and other boards
using the CFI driver, hopefully without breaking any rules.
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/include/asm/arch-at32ap700x/addrspace.h')
| -rw-r--r-- | arch/avr32/include/asm/arch-at32ap700x/addrspace.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/avr32/include/asm/arch-at32ap700x/addrspace.h b/arch/avr32/include/asm/arch-at32ap700x/addrspace.h index 409eee3536..4edc1bd701 100644 --- a/arch/avr32/include/asm/arch-at32ap700x/addrspace.h +++ b/arch/avr32/include/asm/arch-at32ap700x/addrspace.h @@ -75,10 +75,7 @@ static inline void * phys_to_virt(unsigned long address) static inline void * map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) { - if (flags == MAP_WRBACK) - return (void *)P1SEGADDR(paddr); - else - return (void *)P2SEGADDR(paddr); + return (void *)paddr; } #endif /* __ASM_AVR32_ADDRSPACE_H */ |