#!/bin/sh
# Flash a Mono Gateway eMMC image from recovery Linux, leaving the boot
# firmware (4 KiB-32 MiB) intact. Usage: flash-mono-gateway.sh <emmc.img.gz> [dev]
set -e
IMG="$1"; DEV="${2:-/dev/mmcblk0}"
[ -f "$IMG" ] || { echo "usage: $0 <...-emmc.img.gz> [/dev/mmcblkN]"; exit 1; }
case "$IMG" in *.gz) feed(){ gunzip -c "$IMG"; };; *) feed(){ cat "$IMG"; };; esac
echo "GPT (first 4 KiB)...";     feed | dd of="$DEV" bs=512 count=8 conv=fsync
echo "System (from 32 MiB)..."; feed | dd of="$DEV" bs=1M skip=32 seek=32 conv=fsync
sync; echo "Done - set DIP to eMMC and reboot."