Good start. Doesn't the BCM firmware have initramfs support already? Try ORGing it in at a00000 with config.txt. Mainline wasn't that far behind but uses bcm28

Good start. Doesn't the BCM firmware have initramfs support already? Try ORGing it in at a00000 with config.txt. Mainline wasn't that far behind but uses bcm2835 instead of bcm2708. That might change/need an update now - not sure? Will find out in a few days!