[U-Boot] dra7xx: booting from eMMC raw boot partition

[Richard Retanubun <richardretanubun@ruggedcom.com>]

Hi Shankar and Michael,

I am using the ti dra7xx_evm platform, which comes with a Micron MTFC4GVMEA-4M IT device that has two 16MB boot partitions.
I want to load the MLO and uboot into the eMMC's boot partition and boot from it in eMMC automotive peripheral mode.

I am able to write the MLO into the beginning of /dev/mmcblk1boot0 or /dev/mmcblk1boot1 or /dev/mmcblk1 (using dd)
I then used mmc-utils to make sure that CONFIG_PARTITION in the eMMC's extcsd is set to allow booting from boot1 (with ACK).

However, the CPU does not print anything back on the console...

The only way I can get raw eMMC boot mode to work is if I put the MLO on /dev/mmcblk1 (which is the user data area).

by working, I mean that it prints something like this:

U-Boot SPL 2013.04-09402-gc831bca (Nov 19 2013 - 22:05:38)
DRA752 ES1.0
OMAP SD/MMC: 1
...

I have tried the MLO built from both sources from both uboot master from denx and p-ti-u-boot-2013.04 from omapzoom.

I think the SYSBOOT[5:0] settings are correct because it is able to boot the MLO from the eMMC's user data area.

Does the MLO for raw boot mode needs to be different that the MLO for raw user data area?
Is there an errata limitation with the dra7xx for booting MLO from eMMC boot partition?

Am I missing something obvious?

Thank you for everyone's time.
-- 
-- Richard Retanubun