[U-Boot] [PATCH v2] mmc: Update "mmc->part_num" when performing a partition switch

[Stephen Warren <swarren@wwwdotorg.org>]

On 06/04/2013 01:30 PM, Fabio Estevam wrote:
> On Tue, Jun 4, 2013 at 4:21 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
> 
>> This surely has exactly the same issue as the previous version, where
>> the update of part_num was done inside common/env_mmc.c?
> 
> My understading is that the mmc core should update mmc->part_num and I
> don't see such update, or am I missing something?

That seems like a reasonable way for the code to work. However, you'd
need to modify common/env_mmc.c:init_mmc_for_env() so that it saves off
mmc->part_num before switching MMC partitions, so that
fini_mmc_for_env() knows which partition to switch back to. Right now,
it relies on the fact that mmc_switch_part() does not update
mmc->part_num, and hence uses that value to save the previously selected
partition ID.

Also, if you make this change, I think you can update
common/cmd_mmc.c:do_mmcops(), since it will no longer need to update
mmc->part_num after a successful switch.