You need the USB-UART and serial terminal program like a Putty.
1. Boot the board with a Ubuntu SD Card without eMMC.
2. Enter into the u-boot prompt by Enter key or Space key in 3 seconds.
3. Install the eMMC module on the board.
4. Issue a command to connect the eMMC.
Exynos4412 # movi init 1
5. Copy the boot code from SD to eMMC.
Exynos4412 # run copy_uboot_sd2emmc
6. Remove the SD card and power on with the eMMC. The Blue LED should be on by eMMC boot loader.