Simplify Compulab CL-SOM-IMX6 flashing instructions

@drewmoseley thanks a lot for very descriptive topic. Looks like a lot of manual stuff must be done to flash it (at least what I understand from first fast look). One minor thing - would be maybe possible to use picture from the internet (like this one: h instead one which is added recently? Thanks a lot.

I would love to simplify the manual steps but I did not find anything obvious since the objective is to get the install into the onboard eMMC. If imx-usb or some other OTG mechanism will allow the build host to mount the storage as a block device over USB, I have not found instructions for it.

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It might work to do something similar as they have on the WaRP7 board post

An extract:

Setup to update the image (.sdimg)

From U-Boot side from mentioned post:

=> ums 0 mmc 0

From Host side:

sudo dd if=core-image-base-imx7s-warp.sdimg of=/dev/sdX bs=1M && sudo sync

Unfortunately it doesn’t look like the UBoot port has the “ums” command.