#!/bin/busybox sh
# Aurora RAM boot USB1 — diagnostics + USB NCM gadget (static 172.16.42.1/24).
# No block devices, no firmware, no radios. Never exits (failures leave the UART shell).
/bin/busybox mkdir -p /proc /sys /dev /tmp /usr/bin /usr/sbin /sbin
/bin/busybox --install -s
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs devtmpfs /dev 2>/dev/null
mount -t configfs configfs /sys/kernel/config
log() { echo "[init] $*"; echo "[init] $*" > /dev/kmsg 2>/dev/null; }
echo
echo "=== AURORA RAM BOOT USB1 ==="
uname -a
echo "--- model";   cat /proc/device-tree/model; echo
echo "--- cmdline"; cat /proc/cmdline
echo "--- block devices (expected: none, eMMC disabled in DT)"; ls /sys/block

usb_up() {
	for i in $(seq 1 50); do
		udc=$(ls /sys/class/udc 2>/dev/null | head -1)
		[ -n "$udc" ] && break
		sleep 0.2
	done
	echo "--- /sys/class/udc:"; ls -l /sys/class/udc 2>&1
	if [ -z "$udc" ]; then log "NO UDC found - USB gadget skipped"; return 1; fi
	# DEVELOPMENT-ONLY IDs (same dev setup as JZ02: Google 18d1:d001) - not for production
	G=/sys/kernel/config/usb_gadget/aurora
	mkdir -p $G || return 1
	echo 0x18d1 > $G/idVendor
	echo 0xd001 > $G/idProduct
	mkdir -p $G/strings/0x409
	echo "Aurora" > $G/strings/0x409/manufacturer
	echo "Aurora RAM Boot" > $G/strings/0x409/product
	echo "<EMMC_SERIAL>" > $G/strings/0x409/serialnumber
	mkdir -p $G/functions/ncm.usb0 || { log "ncm function create FAILED"; return 1; }
	mkdir -p $G/configs/c.1/strings/0x409
	echo "NCM" > $G/configs/c.1/strings/0x409/configuration
	ln -s $G/functions/ncm.usb0 $G/configs/c.1/
	echo "$udc" > $G/UDC || { log "bind to UDC '$udc' FAILED"; return 1; }
	log "usb gadget bound to UDC '$udc'"
	ifc=$(cat $G/functions/ncm.usb0/ifname 2>/dev/null)
	log "ncm ifname='$ifc' dev_addr=$(cat $G/functions/ncm.usb0/dev_addr) host_addr=$(cat $G/functions/ncm.usb0/host_addr)"
	[ -n "$ifc" ] || return 1
	ip link set lo up
	ip addr add 172.16.42.1/24 dev "$ifc"
	ip link set "$ifc" up
	ip addr show "$ifc"
	log "network: $ifc 172.16.42.1/24 up (static, no DHCP)"
}
usb_up || log "USB/NCM setup incomplete - staying on UART shell"
echo "=== entering shell (exit restarts it) ==="
while true; do
	setsid cttyhack sh
	echo "shell exited, restarting"; sleep 1
done