Selectable boot from eMMC and sdcard

[elseane]

By default, RockPi 4 will always boot from eMMC first when boot partition is present in both eMMC and sdcard.

Is it possible to selectively boot from sdcard or eMMC?

[jack]

How do you want to select? Like the pc with a grub menu and user keyboard to select?

[MarkS]

Yes! That would be great!

[elseane]

a grub menu using keyboard to select or anything else equivalently convenient is good too.

[TheHermit]

I had the same problem when I upgraded from Debian armhf to Debian arm64. A faster microSD card resolved the issue. If the microSD doesn’t respond quickly, arm64 will ignore it’s boot partition.

@O635789 informed me of this and also posted a great comparison of microSD cards on:

microSD Cards Revisit

I’m in the market of storage for my new Rock Pi 4A which I’m going to use as the dedicated smart home controller. So the speed is not important but the endurance is, I could even remove the GUI completely since I’ll run it headless anyway. In my mind microSD or any memory card is not made to last, so I ordered the M.2 extension board and planning to use SSD as the root file system just for that reason. Actually, I just learned using non high endurance microSD cards in Pi-like devices will void …