From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fabio Estevam <festevam@gmail.com>
Date: Wed, 2 Dec 2015 16:52:56 -0200
Subject: [U-Boot] mmc erase fails from U-Boot command line
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To: u-boot@lists.denx.de

Hi Eric,

On Wed, Dec 2, 2015 at 4:47 PM, Eric Nelson <eric@nelint.com> wrote:
> Sure. It's a hack, but shows where we're hitting the problem
> (with the stop command).
>
> We haven't been using the "mmc erase" command, but see this when
> using ums to program eMMC.

Ok, applied your patch, but still get:

=> mmc erase 4000 1000

MMC erase: dev # 2, block # 16384, count 4096 ... Timeout waiting for DAT0 to go
 high!
mmc erase failed
0 blocks erased: ERROR
=>

Thanks