U-Boot loader for Olimex A20 SOM EVB.

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 default environment is trimmed to just what's needed to boot.
• The saveenv command writes to the file u-boot.env on the FAT partition.
• The DTB file name is chosen based on the board model and passed to ubldr.bin using the fdtfile env variable. ubldr.bin loads the DTB from /boot/dtb/ on the FreeBSD partition.
• By default, it loads PIE ubldr.bin from file ubldr.bin on the FAT partition to address 0x42000000, and launches it.

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

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

PR: 210625
Submitted by: manu