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get_magic_at() {
local file="$1"
local pos="$2"
get_image "$file" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
}
platform_check_image_sdcard() {
local file="$1"
local magic
magic=$(get_magic_at "$file" 510)
[ "$magic" != "55aa" ] && {
echo "Failed to verify MBR boot signature."
return 1
}
return 0;
}
platform_do_upgrade_sdcard() {
sync
get_image "$1" | dd of=/dev/mmcblk0 bs=2M conv=fsync
sleep 1
}
platform_copy_config_sdcard() {
mkdir -p /boot
[ -f /boot/kernel.img ] || mount -o rw,noatime /dev/mmcblk0p1 /boot
cp -af "$CONF_TAR" /boot/
sync
umount /boot
}
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