Various updates to build with current (released!) stretch.
Revert "u-boot-exynos in stretch now supports XU3/XU4."
There are user reports saying that the version in stretch
doesn't support the EFI variables.
This reverts commit
2e14b6ffa6e6723989d40400e9837ea60ac3b666.
u-boot-exynos in stretch now supports XU3/XU4.
Drop the /etc/default/grub hacks now that Debian ships a kernel with my deferred probe fix.
Add ledtrig-heartbeat to /etc/modules, since the kernel is currently not able to load that automatically. (Blocked by Debian bug #824941, though.)
Fix a comment.
Add support for building the U-Boot MMC boot partition only.
Support building boot images for eMMC devices.
Minor cleanup.
Switch to getopt for more flexible option parsing.
Initial checkin.