Running into a strange problem with a new Solitude board. I’ve installed a 3rd party linux image (Gentoo) and cannot get the microSD to boot if slotted in the mmc slot. I can boot the exact same image off a USB mmc reader. Hoping someone has an idea of where to look for troubleshooting. (All partitions are mapped as UUIDs, not /dev/XXX, so that’s not the problem) I would think that my initramfs has the right modules/drivers loaded since the board does find the initramfs image.
What is the message you get? You could be missing some config in your kernel for the MMC driver. If it drops to initramfs, look for /dev/mmc devices and dmesg logs regarding mmc.