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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2010-08-12 13:52:54 +0700
committerReinhard Meyer <u-boot@emk-elektronik.de>2010-09-03 15:13:02 +0200
commit1f36f73fe70560a2bd286a7abc8530fdc93af9ae (patch)
tree23ba61ced5254af43107e7d0de5b25b566ac78bb /arch/avr32/lib
parent9cec2fc209a000655af77256a39ede7c7d441e56 (diff)
downloadu-boot-linaro-stable-1f36f73fe70560a2bd286a7abc8530fdc93af9ae.tar.gz
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.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/avr32/lib/board.c b/arch/avr32/lib/board.c
index 9e741d22e..aa589bb4b 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;