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author | Haavard Skinnemoen <haavard.skinnemoen@atmel.com> | 2010-08-12 06:52:54 (GMT) |
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committer | Reinhard Meyer <u-boot@emk-elektronik.de> | 2010-09-03 13:13:02 (GMT) |
commit | 1f36f73fe70560a2bd286a7abc8530fdc93af9ae (patch) | |
tree | 23ba61ced5254af43107e7d0de5b25b566ac78bb /tools/bmp_logo.c | |
parent | 9cec2fc209a000655af77256a39ede7c7d441e56 (diff) | |
download | u-boot-1f36f73fe70560a2bd286a7abc8530fdc93af9ae.tar.xz |
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 'tools/bmp_logo.c')
0 files changed, 0 insertions, 0 deletions