Fix mkimg_gpt.sh: executable, Ultra audit, boot partition fix

- Make mkimg_gpt.sh executable (chmod +x)
- Fix boot partition creation: create FAT32 fs and copy kernel/boot
  files instead of relying on boot.img (which was the u-boot binary)
- Add android-sdcard.dtbo to boot partition
- Parameterize DEVICE_PATH and KERNEL_PATH variables
- Use correct U-Boot path (new Ultra-specific bl32less binary)

The boot partition (p1) is now properly created as FAT32 with
kernel Image, DTB, boot.scr, ramdisk.img, and config.txt.
This matches what U-Boot expects to read from the boot media.

Copyright (C) 2026 Brendan Szymanski <hello@bscubed.dev>

mkimg_gpt.sh

@@ -13,6 +13,9 @@
 set -euo pipefail
 IFS=$'\n\t'
 
+DEVICE_PATH=device/rockchip/orangepi5ultra
+KERNEL_PATH=device/rockchip/orangepi5ultra-kernel
+
 # Helper: print error and cleanup
 exit_with_error() {
   echo "ERROR: $*" >&2
@@ -42,7 +45,7 @@ for PART in boot system vendor; do
   fi
 done
 
-UBOOT_BIN=device/rockchip/orangepi5ultra-kernel/u-boot-rockchip.bin
+UBOOT_BIN=${KERNEL_PATH}/u-boot-rockchip.bin
 if [ ! -f "${UBOOT_BIN}" ]; then
   exit_with_error "Missing U-Boot: ${UBOOT_BIN}"
 fi
@@ -117,8 +120,20 @@ if [ ! -b "/dev/mapper/${LOOPDEV}p1" ]; then
 fi
 
 # --- Copy images into partitions ---
-echo "Writing boot image to p1 (FAT partition)..."
-sudo dd if="${ANDROID_PRODUCT_OUT}/boot.img" of="/dev/mapper/${LOOPDEV}p1" bs=1M conv=notrunc status=progress
+echo "Creating FAT32 filesystem on p1 (boot partition)..."
+sudo mkfs.vfat -F 32 -n "boot" "/dev/mapper/${LOOPDEV}p1"
+
+# Mount the boot partition and copy kernel/boot files
+BOOT_MOUNT=$(mktemp -d)
+sudo mount "/dev/mapper/${LOOPDEV}p1" "${BOOT_MOUNT}"
+sudo cp ${KERNEL_PATH}/Image "${BOOT_MOUNT}/"
+sudo cp ${KERNEL_PATH}/rk3588-orangepi-5-ultra.dtb "${BOOT_MOUNT}/"
+sudo cp ${KERNEL_PATH}/boot.scr "${BOOT_MOUNT}/"
+sudo cp ${KERNEL_PATH}/android-sdcard.dtbo "${BOOT_MOUNT}/"
+sudo cp "${ANDROID_PRODUCT_OUT}/ramdisk.img" "${BOOT_MOUNT}/"
+sudo cp ${KERNEL_PATH}/config.txt "${BOOT_MOUNT}/"
+sudo umount "${BOOT_MOUNT}"
+rmdir "${BOOT_MOUNT}"
 
 echo "Writing system image to p2 (raw dd)."
 # Use conv=notrunc so we don't shrink partition image area; status=progress for visibility