[coreboot] [RFC] MMC support in coreboot

[Kevin O'Connor]

On Thu, Jan 09, 2014 at 01:46:19AM -0600, mrnuke wrote:
> It's essential for some ARM SoCs. Allwinner chips like the MMC as their
> first boot source, and people are very happy with having their firmware
> and linux on micro SD. It makes the system unbrickable.

Can you expand on this requirement?  Do these machines have a regular
flash/rom with code that reads the rest of the firmware from the block
device, or is some portion of the block device mapped by hardware at
startup and that portion is tasked with reading the rest of the
firmware off the block device?  If so, how big is the initial mapped
area?

-Kevin