It was a couple megs or so. So in order to flash Openwrt on the MR8300 it must be on partition 2 and not partition 1.
So do the following:
- Boot into U-boot
- tftp 84000000 [filename].itb (initramfs)
- bootipq
- bootm (this loads your tftp flash from memory)
- Login to OpenWRT
- Go to update firmware and flash the sysupgrade.bin
- After reboot you'll have a good running openwrt router.
So there isn't any needed drivers or builds required other than the one built for the EA8300. It has more RAM than the EA8300 and I am not sure about space. Also the bluetooth doesn't work either. I am running this as we speak and I haven't seen any issues. So this can be listed as usable just the means of flashing is via tftp only.