[PATCH] mtd-core: fix mtd erase operation for non-uniform flashes.

[Sascha Hauer]

On Wed, May 22, 2013 at 05:54:16PM +0100, Renaud Barbier wrote:
> This patch supports the erasing of CFI flash with non-uniform sector.
> When more than one erase region exists, the mtd_erasesize function
> assigns the erase size of the sector to the erase_info structure.
> 
> The problem was discovered when erasing /dev/env0 on my PPC board.
> This is a partition of size 0x8000 at offset 0 of a 32MB Intel compatible
> flash with a bottom boot block i.e 4 32KB sectors followed by 255
> 128KB sectors.
> 
> barebox> unprotect /dev/env0
> barebox> erase /dev/env0
> cfi_erase: start = 0x0, end = 0x3, count = 0x20000
> Flash erase error at address fe008000
> Block Erase Error.
> Block locked.
> erase: I/O error
> 
> The error above is that a count of 0x20000 is passed instead of 0x8000
> by mtd_op_erase. This is because the code does not take into account
> multiple erase regions.
> 
> After taking into account the erase regions, only the first sector is
> erased:
> 
> barebox> unprotect /dev/env0
> barebox> erase /dev/env0
> cfi_erase: start = 0x0, end = 0x0, count = 0x8000
> 
> Signed-off-by: Renaud Barbier <renaud.barbier at ge.com>

Applied, thanks

Sascha


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