Various places in the code set "boardname" env property.  It was used
for booting from ITB images and choosing proper DTB file name.  Instead
of duplicating it, use existing U-Boot wide - "board_name".

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

This commit adjusts the autoboot.cmd file to use ${mmcbootdev} instead of
hardcoded value 0.

This is necessary to allow booting this board from the SD card.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

This fix is necessary to avoid booting the default ITB configuration.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>

This commit adds example scripts of boot.scr:
- bootzimg.cmd - check if dtb exists and boot zImage
- autoboot.cmd - check which image exists: Image.itb, zImage or uImage
                 and optionally load fdt file for u/zImage

The blank spaces are added to improve readability and can be removed
before use mkimage.

Required U-Boot environment variables: $boardname, $fdtfile, $console,
$mmcbootdev, $mmcbootpart, $mmcrootdev, $mmcrootpart, $rootfstype.

Making boot.scr from file.cmd:
 mkimage -C none -A arm -T script -d file.cmd boot.scr

The Odroid XU3 default environment is ready for those boot scripts and
the right script can be loaded by DFU.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>