I'm compiling linux for this device but having trouble booting it. Everything I've come across so far points to a missing kernel driver for the card reader controller chipset. The closest .config option I've run across is CONFIG_EHCI_HCD_PLATFORM which directly references a cousin chipset from the manufacturer Genysis which manufactured the controller chipset for this board.
It is compiled with EFI stubs, all generic MMC, USB, and SD drivers. The kernel will boot into a panic VFS: unknown-block(0,0) when setting the efi unicode tag to 'root=/dev/sda3'. I'm trying to not use an initramfs.
Basically, I'm trying to use this guide without using PARTUUID https://wiki.gentoo.org/wiki/EFI_stub_kernel