You could do a lot worse than putting a BSP uboot on your emmc,
manjaro has one, it has no search for nvme (boot_target), doesn't matter if you have no nvme
uboot-pinebookpro-bsp-1.5-7-aarch64.pkg.tar.xz,, search for only the name
It has the 3 normal files for a BSP uboot,,,, idbloader, uboot, trust
----
BTW, manjaro, like everyone else, does not actually "install" these files,
just "dumps" them into boot
You have to do the appropriate dd commands to get them into place
manjaro has one, it has no search for nvme (boot_target), doesn't matter if you have no nvme
uboot-pinebookpro-bsp-1.5-7-aarch64.pkg.tar.xz,, search for only the name
It has the 3 normal files for a BSP uboot,,,, idbloader, uboot, trust
----
BTW, manjaro, like everyone else, does not actually "install" these files,
just "dumps" them into boot
You have to do the appropriate dd commands to get them into place