False device tree file path with extlinux

[MichaIng]

As reported in #5, when extlinux is used, the device tree file is not found as the given path is wrong:

Retrieving file: /dtbs/5.10.69-4-amlogic-g37ae4051315a/amlogic/amlogic/meson-g12a-radxa-zero.dtb
Failed to load '/dtbs/5.10.69-4-amlogic-g37ae4051315a/amlogic/amlogic/meson-g12a-radxa-zero.dtb'

Reason is the doubled amlogic path element, which seems to be due to:

• devicetreedir /dtbs/5.10.69-4-amlogic-g37ae4051315a/amlogic in /boot/extlinux/extlinux.conf
• fdtfile=amlogic/meson-g12a-radxa-zero.dtb in /boot/uEnv.txt
• and I suspect that both are concatenated. Removing that path element either in extlinux.conf or in uEnv.txt resolves the issue, but removing it in uEnv.txt breaks boot.scr, of course.

Since for boot.scr, the uEnv.txt is correct, I suggest to adjust extlinux.conf and the related kernel update script instead, to set devicetreedir /dtbs/<kernelversion> without the trailing /amlogic.

[StephenInVamrs]

Can you provide me the steps to reproduce this issue?

[MichaIng]

1. Boot this image: https://github.com/radxa/radxa-zero-images-released/releases/download/radxa-zero-v20211010/zero_debian_buster_xfce4_arm64_20211010_0810-mbr.img.gz
2. apt install linux-image-5.10.69-4-amlogic-g37ae4051315a
3. Reboot with serial console attached
4. Watch #5 errors first, then fallback to extlinux, then the above two error messages.