This enables an auto-update mechanism on post-upgrade for the u-boot
firmware on the librem 5 and librem 5 devkit. This mechanism is largely
copied from the implementation in the pinephone u-boot package.
efidebug is useful for booting the kernel via EFI mode in u-boot.
Changes from purism:
- 2 second boot delay removed
- This includes an updated DDR memory training firmware version.
- patch to work around wifi device not being available on boot
Package changes:
- u-boot installed in location consistent with other pmaports/u-boot
packages
- update-u-boot script added for upgrading u-boot on the device
- devkit u-boot split off into a sep. subpackage