play: WIP bootloading

boards/beagleplay/demos-and-tutorials/boot/install-emmc.sh

+#!/bin/bash
+
+if ! id | grep -q root; then
+	echo "must be run as root"
+	exit
+fi
+
+wdir="/opt/u-boot/bb-u-boot-beagleplay"
+
+if [ -b /dev/mmcblk0 ] ; then
+	#mmc extcsd read /dev/mmcblk0
+	mmc bootpart enable 1 2 /dev/mmcblk0
+	mmc bootbus set single_backward x1 x8 /dev/mmcblk0
+	mmc hwreset enable /dev/mmcblk0
+
+	echo "Clearing eMMC boot0"
+
+	echo '0' >> /sys/class/block/mmcblk0boot0/force_ro
+
+	echo "dd if=/dev/zero of=/dev/mmcblk0boot0 count=32 bs=128k"
+	dd if=/dev/zero of=/dev/mmcblk0boot0 count=32 bs=128k
+
+	echo "dd if=${wdir}/tiboot3.bin of=/dev/mmcblk0boot0 bs=128k"
+	dd if=${wdir}/tiboot3.bin of=/dev/mmcblk0boot0 bs=128k
+fi