[PATCH v2] cmd: mmc: add mmcboot command

[Ravik Hasija]

> Can this not be implemented by some U-Boot script ?
> I can imagine that reading the first few bytes from the partition (mmc
> read) would permit you to obtain the uImage/fitImage header from the
> partition, from which you can obtain the image size, which is the total
> number of bytes to read (iminfo might help , or fdt header), and then
> read out the entire image and bootm it.

Using this command provides the advantage to reduce code replication &
maintainence by leveraging existing APIs (common_diskboot) which
functionally does the same thing as a uboot script would do read one block,
get size from header, read whole image, and bootm it, while additionally
doing basic checks.



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