68 lines
2.3 KiB
Bash
Executable File
68 lines
2.3 KiB
Bash
Executable File
#!/bin/bash
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# flash-cm4.sh - Flash CM4 eMMC while EMMC_DISABLE jumper is bridged
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# Usage: ./scripts/flash-cm4.sh [/dev/sdX]
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# If no device given, auto-detects the CM4 USB mass storage device.
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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BEACON_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
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REPO_ROOT="$(cd "$BEACON_DIR/.." && pwd)"
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USBBOOT_DIR="$REPO_ROOT/usbboot"
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IMAGE="$REPO_ROOT/output/images/sdcard.img.xz"
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# Build rpiboot from source if not already compiled
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if [ ! -x "$USBBOOT_DIR/rpiboot" ]; then
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echo "==> Building rpiboot from source..."
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make -C "$USBBOOT_DIR"
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fi
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# Step 1: Expose CM4 eMMC as USB mass storage
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echo "==> Running rpiboot to expose CM4 eMMC (EMMC_DISABLE jumper must be bridged)..."
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sudo "$USBBOOT_DIR/rpiboot" -d "$USBBOOT_DIR/mass-storage-gadget64"
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echo "==> rpiboot done, waiting for block device..."
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# Step 2: Find the device (explicit arg or auto-detect USB disk ~8 GiB)
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if [ -n "${1:-}" ]; then
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DEVICE="$1"
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echo "==> Using specified device: $DEVICE"
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else
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DEVICE=""
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for i in $(seq 1 30); do
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sleep 1
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# Detect USB block device of 7-8 GiB (CM4 eMMC)
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DEVICE=$(lsblk -dno NAME,TRAN,SIZE \
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| awk '$2=="usb" && ($3~/^7\.[0-9]+G$/ || $3~/^8\.[0-9]+G$/) {print "/dev/"$1}' \
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| head -1)
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[ -n "$DEVICE" ] && break
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printf " waiting... (%ds)\r" "$i"
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done
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if [ -z "$DEVICE" ]; then
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echo "ERROR: CM4 eMMC did not appear as a USB block device within 30s."
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echo " Run 'lsblk' manually and re-run with explicit device: $0 /dev/sdX"
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exit 1
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fi
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echo "==> Auto-detected CM4 eMMC at $DEVICE"
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fi
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# Step 3: Safety check - refuse to flash the host nvme/sata disk
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if echo "$DEVICE" | grep -qE '^/dev/(nvme|sd[a-z]{2,}|sda$)'; then
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lsblk -dno TRAN "$DEVICE" | grep -qx usb || {
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echo "ERROR: $DEVICE does not appear to be a USB device. Aborting."
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exit 1
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}
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fi
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# Step 4: Unmount any auto-mounted partitions
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echo "==> Unmounting $DEVICE partitions..."
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sudo umount "${DEVICE}"?* 2>/dev/null || true
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sudo umount "${DEVICE}"[0-9]* 2>/dev/null || true
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# Step 5: Flash via bmaptool
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echo "==> Flashing $IMAGE -> $DEVICE ..."
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sudo bmaptool copy "$IMAGE" "$DEVICE"
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sudo sync
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echo ""
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echo "==> Flash complete!"
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echo " Remove the EMMC_DISABLE jumper, then power-cycle the CM4."
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