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U-Boot loader for Banana Pi.
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
using the fdtfile env variable. ubldr loads the DTB from /boot/dtb/ on
the FreeBSD partition.
* By default, it loads ELF ubldr from file ubldr on the FAT partition
to address 0x42000000, and launches it.
For information about running FreeBSD on Banana Pi, see
https://wiki.freebsd.org/FreeBSD/arm/Allwinner
For general information about U-Boot see WWW: http://www.denx.de/wiki/U-Boot
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