Upgrading bootloader

[Alex Kiernan <alex kiernan gmail com>]

I've a need to upgrade the bootloader and boot scripts (U-Boot) as
part of a deployment. Right now I'm deploying a systemd unit which
upgrades it on reboot, but you obviously end up with the first reboot
going through the old bootloader.

The grub2 code looks like it has support for doing that kind of thing,
but the u-boot code doesn't - am I right in my thinking, or am I
missing something?

-- 
Alex Kiernan