We don't need to append the dtb to the kernel image in all cases, with
e.g. the u-boot bootloader we can load the dtb seperately from the
kernel image. Introduce a new variable deviceinfo_append_dtb, if set to
"true", append the dtb, otherwise just copy the dtb file to the boot
partition.
Fixes#260
[ci:ignore-count]
This is tested to boot on google-crosshatch, following these
instructions:
$ pmbootstrap init, choose the mainline kernel
$ pmbootstrap install --no-fde
$ pmbootstrap initfs hook_add debug-shell
(enter fastboot mode on the device)
$ fastboot set_active a
$ fastboot flash dtbo_a ~/.local/var/pmbootstrap/chroot_rootfs_google-crosshatch/boot/dtbo-google-crosshatch-mainline.img
$ pmbootstrap flasher boot
And you should get telnet after a while. This kernel takes a long time
to build, so [skip ci]. I can confirm it builds locally.
Note that this patch adds the mainline dtb path to deviceinfo. But the
parameter gets ignored on the downstream kernel, so it's fine to keep it
in the shared deviceinfo.
Mainlining this device is work in progress, details at:
https://gitlab.com/postmarketOS/pmaports/issues/153
