[U-Boot] eMMC boot partition support in uboot

[Tom Rini]

On Thu, Dec 05, 2013 at 01:46:40PM -0500, Richard Retanubun wrote:

> Hi guys,
> 
> Recap: I am trying to boot MLO + uboot from eMMC boot partition on DRA7xx_EVM eval platform.
> SW-Baseline: uboot p-ti-uboot-2013.04 & p-ti-linux-3.8.y from omapzoom.

Please note that this list is for the mainline U-Boot tree, and to
contact your TI reps for help with the TI trees.  I'm answering in
general since I know how the mainline code works, and what I suspect
needs doing there in general to allow what you want to work:

[snip]
> 3. I realize that the MLO contents (using uboot/tools/omapimage?) needed to say
>    MMCSD_MODE_RAW for my platform. I am bypassing this problem by by hard coding the response
>    arch/arm/cpu/armv7/omap-common/boot-common.c::spl_boot_mode() to always says MMCSD_MODE_RAW.
>    This seems to work and I am past the hang() code.

It's possible that the ROM simply doesn't support a dos-style partition
table and a FAT partition on the eMMC boot partition so the right answer
here is to do what you're doing and hard-code raw only.  I strongly
suspect this to be true, even.

> 4. Now, MLO is ready to (raw) load uboot binary from the eMMC boot partition (i.e. /dev/mmcblk1boot0).
>    Unfortunately, at this point I don't know how to make the platform recognize the eMMC boot partitions.
>    I think they are not modelled yet in uboot. Only the User-Data-Area (UDA)
>    is recognized in uboot (called mmc 1)

Not quite true, no.  You'll need code similar to what we have in
common/env_mmc.c to switch the partition to the boot partition.

-- 
Tom
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