Hi, Our ARM32 Linux embedded system consists of these: * Linux Kernel: 4.14 * Processor: Qualcomm Arm32 Cortex-A7 * Storage: NAND 512MB * Platform: Simple busybox * Filesystem: UBIFS, Squashfs * Consists of nand raw partitions, squashfs ubi volumes. My requirement: To find the checksum of a real image in runtime which is flashed in an MTD partition. Problem: Currently, to find the checksum, we are using: $ md5sum /dev/mtd14 This returns the proper checksum of the entire partition. But we wanted to find the checksum only for the actual image data which will be used by our C utility to validate the image. Here, we don't know the actual image size. We only know the "partition-size" and "erasesize". So, is there a mechanism to somehow find the image size at runtime? Regards, Pintu