On Thu, Aug 11, 2016 at 09:39:17PM +0200, Andreas Fenkart wrote:
56086921 added support for unaligned environments access. U-boot itself does not support this:
- env_nand.c fails when using an unaligned offset. It produces an error in nand_erase_opts{drivers/mtd/nand/nand_util.c}
- in env_sf/env_flash the unused space at the end is preserved, but not in the beginning. block alignment is assumed
- env_sata/env_mmc aligns offset/length to the block size of the underlying device. data is silently redirected to the beginning of a block
There is seems no use case for unaligned environment. If there is some useful data at the beginning of the the block (e.g. end of u-boot) that would be very unsafe. If the redundant environments are hosted by the same erase block then that invalidates the idea of double buffering. It might be that unaligned access was allowed in the past, and that people with legacy u-boot are trapped. But at the time of 56086921 it wasn't supported and due to reasons above I guess it was never introduced. I prefer to remove that (unused) feature in favor of simplicity
Signed-off-by: Andreas Fenkart andreas.fenkart@digitalstrom.com Acked-by: Stefan Agner stefan.agner@toradex.com
Applied to u-boot/master, thanks!