Kumar Gala wrote:
As I look at this we really need to understand what Haavard was trying to get with:
commit 12d30aa79779c2aa7a998bbae4c075f822a53004 Author: Haavard Skinnemoen hskinnemoen@atmel.com Date: Thu Dec 13 12:56:34 2007 +0100
cfi_flash: Use map_physmem() and unmap_physmem() Use map_physmem() and unmap_physmem() to convert from physical to virtual addresses. This gives the arch a chance to provide anuncached mapping for flash accesses.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>Since this only addresses the usage in cfi_flash.c but not in other users of flash_info (like commands)
Yeah, there are probably tons of places that really should use map/unmap_physmem() but doesn't. I've been playing with the thought of enabling the Paging bit on AVR32 to support uncached mappings of all physical memory...this is likely to make all of those places very visible.
My goal was to solve a very specific problem (make the cfi_flash driver work on AVR32 boards) by introducing a generic primitive which may be used to solve other similar problems in the future.
I also think it conceptually makes sense to treat physical and virtual addresses as different entities, as they are fundamentally not the same thing on many architectures.
Haavard