[U-Boot] [PATCH V2] cmd_mmc.c: check mmc_init() during mmc dev

[Stephen Warren]

On 05/20/2014 11:40 PM, Jaehoon Chung wrote:
> Hi, Stephen.
> 
> i didn't apply your patch. Which repository do you use?

It's based on u-boot.git master branch. The latest u-boot-mmc.git master
branch is already included in that branch, and it looks like some
changes have been applied to cmd_mmc.c in u-boot/master that aren't in
u-boot-mmc/master.

> Well, if you want to check, can be used "if (mmc_init(mmc))".
> 
> And i'm not sure whether this code is really need or not.

Why not? This code is required to solve the problem described in the
commit description:

> On 05/21/2014 01:57 AM, Stephen Warren wrote:
>> From: Bryan Wu <cooloney at gmail.com>
>>
>> mmc dev ${devnum} will return 0 as success even if there is no card
>> inserted. Booting script like tegra-common-post.h will call mmc dev
>> ${devnum} to check the mmc device status, it always return 0 even if
>> mmc_init() fails.