Mask ROM boot
What is the method for overriding eMMC, etc. to get the mask ROM boot loader via USB?
I think the simplest is to remove eMMC, start, and re-connect eMMC. It will start in mask rom mode.

Rock/Pro 64/Pinebook Pro: LinuxChromium OS
So/Pine A64/Pinebook: LinuxAndroid 6.0Android 7.1

Buy me a Beer
There is a small switch on the soon production released mainboard (ver 2.1) that allows disable eMMC without taking out the eMMC module.

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