How do I copy the image from SD card to the emmc using linux commands?

I am trying to flash a custom image from my SD card (mmcblk0) onto the emmc (mmcblk1) of my BeagleBone. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT mmcblk0 179:0 0 14.9G 0 disk ├─mmcblk0p1 179:1 0 96M 0 part ├─mmcblk0p2 179:2 0 3.5G 0 part / └─mmcblk0p3 179:3 0 9.8M 0 part mmcblk1 179:8 0 3.6G 0 disk mmcblk1boot0 179:16 0 2M 1 disk mmcblk1boot1 179:24 0 2M 1 disk I try to run this command but it says there is no space left on my emmc - sudo dd if=/dev/mmcblk0 of=/dev/mmcblk1 bs=4M status=progress 3825205248 bytes (3.8 GB, 3.6 GiB) copied, 306 s, 12.5 MB/s dd: error writing '/dev/mmcblk1': No space left on device 913+0 records in 912+0 records out 3825205248 bytes (3.8 GB, 3.6 GiB) copied, 306.278 s, 12.5 MB/s But the image I want to copy is less than 3.6GB in total - df -h Filesystem Size Used Avail Use% Mounted on udev 10M 0 10M 0% /dev tmpfs 100M 4.2M 96M 5% /run /dev/mmcblk0p2 3.4G 2.8G 454M 87% / tmpfs 249M 0 249M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 249M 0 249M 0% /sys/fs/cgroup /dev/mmcblk0p1 96M 31M 66M 32% /boot/uboot /dev/mmcblk0p3 9.8M 18K 9.8M 1% /usb_drive My SD card size is almost 15GB and I guess that is the reason it says there is no space left on the device. It is trying to copy the whole of 15GB. I also tried to individually copy just the mmcblk0p2 to my mmcblk1, removed the SD card and tried to boot from the emmc using the command - sudo dd if=/dev/mmcblk0p2 of=/dev/mmcblk1 bs=4M status=progress But it does not work. The User LEDs do not turn on at all. How do I get the image to boot from the emmc? Thank you.