Commit graph

2 commits

Author SHA1 Message Date
Andreas Bießmann
e9ed41cc5c avr32: rename mmu.h definitions
Prefix mmu.h PAGE_xxx definitions with MMU_ in order to prevent a naming
conflict with other definitions.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
2015-02-17 22:52:40 +01:00
Haavard Skinnemoen
1f36f73fe7 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>
2010-09-03 15:13:02 +02:00