Uboot says bad image magic - mainline kernel

[lash]

This was great fun, I reached the first milestone and if it's of interest to anyone I thought I'd share my experience:

Did not see usb stick assigned to sdX, but spotted kmod "uas" depending on usb_storage on my own PC. Thus added CONFIG_USB_UAS=y to config. After that it shows up in pine's kernel.

(Though, when usb stick plugged in at powerup, path for root /dev/mmcblk0p1 does not work anymore, but that can be sorted later).

Statically built bash and used as init (using crosstool-ng, works like a charm):

Code:

bash
        export CROSS_COMPILE=aarch64-unknown-linux-gnu-
        export ARCH=arm64
        export PATH=$PATH:/home/lash/x-tools/aarch64-unknown-linux-gnu/bin
        ./configure --host aarch64-unknown-linux-gnu --enable-static-link --enable-minimal-config 
        make CFLAGS="-Wl,-w" -j8

final u-boot command sequence:

Code:

        setenv bootargs root=/dev/mmcblk0p1 init=/bin/bash earlycon console=tty debug loglevel=7
        fatload mmc 0:1 0x42000000 /boot/Image
        fatload mmc 0:1 0x45000000 /boot/u-boot.dtb
        booti 0x42000000 - 0x45000000

sdcard tree:

Code:

/mnt:
bin  boot

/mnt/bin:
bash

/mnt/boot:
Image  u-boot.dtb

can't do much with this of course, but from here on it is pretty familiar territory

Ah yes, and still on the 5.14 kernel.