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 /board/atmel/atstk1000 | |
| 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 'board/atmel/atstk1000')
| -rw-r--r-- | board/atmel/atstk1000/atstk1000.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c index d91d5940b5..8b1e1b57d7 100644 --- a/board/atmel/atstk1000/atstk1000.c +++ b/board/atmel/atstk1000/atstk1000.c @@ -25,11 +25,26 @@ #include <asm/sdram.h> #include <asm/arch/clk.h> #include <asm/arch/hmatrix.h> +#include <asm/arch/mmu.h> #include <asm/arch/portmux.h> #include <netdev.h> DECLARE_GLOBAL_DATA_PTR; +struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = { + { + .virt_pgno = CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT, + .nr_pages = CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT, + .phys = (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT) + | MMU_VMR_CACHE_NONE, + }, { + .virt_pgno = CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT, + .nr_pages = EBI_SDRAM_SIZE >> PAGE_SHIFT, + .phys = (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT) + | MMU_VMR_CACHE_WRBACK, + }, +}; + static const struct sdram_config sdram_config = { #if defined(CONFIG_ATSTK1006) /* Dual MT48LC16M16A2-7E (64 MB) on daughterboard */ |