Oh right okay. Yeah now that you mention it. I do seem to recall watching somebody’s video booting the reform from the SD card. Well then, that’s even better: I can just backup the SD card and reinstall over anything I’m not happy with.
I’m totally unfamiliar with how these things boot. I’m not even sure it’s more or less standardized between various SoMs. But I suppose it’s possible to select which device to boot from at some point or other after power-up. So maybe what I’ll do is follow the manual just to familiarize myself with the machine as MNT Research intended, then install Ubuntu on a SD card and boot off of that, until I’m happy enough with it and replace the default stuff on the eMMC with it.
I’m curious: why do you need an I/O board with the Banana Pi CM4? Do you need a JTAG or SWD port that the add-on board provides to program the flash if the updater gets hosed or something like that?
Interesting… I’ll have to dive into all that at some point. Thanks!