update uboot (locally or remotely) on a single-partition SD card with BeagleBoard image.

flash_mainline.sh

#!/bin/bash -ex
MLO=MLO
IMG=u-boot.img
if [ ! "x${SSH_DEST}" = "x" ]; then
	SSH_CMD="ssh -tt $SSH_DEST"
	scp $MLO ${SSH_DEST}:MLO
	scp $IMG ${SSH_DEST}:uboot.img
	MLO=MLO
	IMG=uboot.img
else
	SSH_CMD="bash -c"
fi
if [ ! "x${DISK}" = "x" ] ; then
	${SSH_CMD} "[ -e \"${DISK}\" ] &&\
		sudo dd if=${MLO} of=${DISK} count=2 seek=1 bs=128k &&\
		sudo dd if=${IMG} of=${DISK} count=4 seek=1 bs=384k &&\
		sync &&\
		sudo reboot ||\
		echo Error, maybe DISK=${DISK} does not exist?"
else
	echo Error, on DISK= specified
	exit 1
fi