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| 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/lib | |
| parent | 9cec2fc209a000655af77256a39ede7c7d441e56 (diff) | |
| download | u-boot-imx-1f36f73fe70560a2bd286a7abc8530fdc93af9ae.zip u-boot-imx-1f36f73fe70560a2bd286a7abc8530fdc93af9ae.tar.gz u-boot-imx-1f36f73fe70560a2bd286a7abc8530fdc93af9ae.tar.bz2 | |
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/lib')
| -rw-r--r-- | arch/avr32/lib/board.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/avr32/lib/board.c b/arch/avr32/lib/board.c index 9e741d2..aa589bb 100644 --- a/arch/avr32/lib/board.c +++ b/arch/avr32/lib/board.c @@ -33,6 +33,7 @@ #include <asm/initcalls.h> #include <asm/sections.h> +#include <asm/arch/mmu.h> #ifndef CONFIG_IDENT_STRING #define CONFIG_IDENT_STRING "" @@ -265,6 +266,9 @@ void board_init_r(gd_t *new_gd, ulong dest_addr) gd->flags |= GD_FLG_RELOC; gd->reloc_off = dest_addr - CONFIG_SYS_MONITOR_BASE; + /* Enable the MMU so that we can keep u-boot simple */ + mmu_init_r(dest_addr); + board_early_init_r(); monitor_flash_len = _edata - _text; |