First Impressions

[mspohr]

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All my builds can be put either on eMMC or run from SD card. This allows you to have multi-boot when needed.

Is there something you can do at boot time to choose whether to have it run from SD card or install to eMMC?
It seems that this is set within the image file and not a boot option.

Once you use Ayufan's install_to_emmc script, the Pinebook basically goes:
You got an SD card in me? Alright let's try booting from that.
Oh, there isn't an SD card? Then let's try booting from the eMMC.

So you can theoretically plop in an SD card when you'd like to use a different OS. The Pinebook comes with only 16gb eMMC, but you can upgrade that pretty easily.

The problem is that some of the SD card images boot and immediately overwrite the eMMC with their contents. I'd like to change these images so that they boot the OS itself from the SD card and leave the existing eMMC contents.
Ayufan's Android 7.1 image appears to do this but the Android 6 and Ubuntu Mate images install themselves in the eMMC.