Update (my previous comment has not been approved yet so I'm adding info here)
Manjaro-ARM seems to boot from a USB stick. It's pretty slow, but I've got a splash screen at least. And only the right USB port seems to be recognized.
I had to keep the SD card in the slot for it to boot at all. Otherwise the screen and power LED wouldn't turn on at all. So the SD card won't boot without the above errors; the USB stick won't boot it at all; but the SD card inserted and the USB stick inserted (both flashed with the same image) seem to allow the USB stick to boot.
Manjaro-ARM seems to boot from a USB stick. It's pretty slow, but I've got a splash screen at least. And only the right USB port seems to be recognized.
I had to keep the SD card in the slot for it to boot at all. Otherwise the screen and power LED wouldn't turn on at all. So the SD card won't boot without the above errors; the USB stick won't boot it at all; but the SD card inserted and the USB stick inserted (both flashed with the same image) seem to allow the USB stick to boot.