check_boot_files.sh

#!/bin/bash
# compare the boot files on the RPi's SSD with the files on the SD card

sudo mount -r /dev/mmcblk0p1 /mnt/sdboot 2>/dev/null

# SSD BOOT FILES
FILE1="/boot/bcm2710-rpi-3-b.dtb"

# SD CARD BOOT FILES
FILE2="/mnt/sdboot/bcm2710-rpi-3-b.dtb"
FILE2BAD="/mnt/sdboot/bcm2710-rpi-3-b-plus.dtb"

# cmp --silent $FILE1 $FILE2    || echo "Files differ - update boot!"
# cmp --silent $FILE1 $FILE2BAD || echo "(test) Files differ - update boot!"

if cmp --silent $FILE1 $FILE2 ; then
  echo "Boot file test OK"
else
  echo "***** Boot files differ!"
fi

sudo umount /mnt/sdboot