meta-rpi/tools/scripts/flash_bbb.sh

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#!/bin/sh
# Remove old partitions on emmc.
dd if=/dev/zero of=/dev/mmcblk1 bs=512 count=1
# Create new partition table.
echo "n
p
1
+70M
a
t
c
n
p
w" | fdisk /dev/mmcblk1
# Create file systems.
mkfs.vfat -F 32 -n "boot" /dev/mmcblk1p1
yes | mkfs.ext4 -L "rootfs" /dev/mmcblk1p2
# Flash boot partition.
mount /dev/mmcblk1p1 /media
cp MLO /media
cp u-boot.img /media
cp uExt.txt /media
sync
umount /dev/mmcblk1p1
# Flash rootfs partition
mount /dev/mmcblk1p2 /media
tar -C /media -xf rootfs.tar.bz2
sync
umount /dev/mmcblk1p2