U-Boot loader for NanoPi Neo Air.

To install this bootloader, follow the instructions in
 http://linux-sunxi.org/Bootable_SD_card#Bootloader

This version is patched so that:
 * ELF and API features are enabled.
 * The distroboot command knows how to load FreeBSD loader(8)
 * By default, it loads ubldr.bin (PIE) from file ubldr.bin on the FAT
   partition to address 0x42000000, and launches it. If ubldr.bin is
   not found, it falls back on ubldr

For information about running FreeBSD on NanoPi Neo, see
 https://wiki.freebsd.org/FreeBSD/arm/Allwinner

For general information about U-Boot see WWW: http://www.denx.de/wiki/U-Boot