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When I open the folder install/ into cl-som-imx7-linux.zip, I scan with file
command to understand what I have, usually ARM hardware use uboot, then I hope uboot system + linux kernel + ramdisk.
I wish gentoo to have better 0-days hardened, but have to uSD card allow me debug the OS offline, save the data in all case.
Into the boot scr decompiled I see:
setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=$tty vram=16M auto_install ${board_param}" setenv ramimg ramdisk.img load ${storagetype} ${storagedev} ${fdtaddr} ${fdtfile} load ${storagetype} ${storagedev} ${loadaddr} ${kernel} load ${storagetype} ${storagedev} ${rdaddr} ${ramimg}
Then it will be easy the boot the current kernel to uSD part to boot gentoo.