[U-Boot] mmc erase command fails with DAT0 timeout on eMMC on iMX6 board

[Palacios, Hector]

Hello,

I can see the command 'mmc erase blk# cnt' fails with a DAT0 timeout on iMX6 boards when run over the eMMC.

=> mmc dev 2 
=> mmc erase 4000 1000 
MMC erase: dev # 2, block # 16384, count 4096 ... Timeout waiting for
DAT0 to go high! 
mmc erase failed 
0 blocks erase: ERROR

I reproduced it with the SabreSD board running upstream U-Boot v2015.04.
The error does not happen using microSD card, though.

Does anybody else have the same problem on other iMX6 based boards?
Thank you.

PS. Increasing the timeout value ad infinitum does not help.
--
Héctor Palacios