Rongping s5p6818 Development Board Ubuntu version in Uboot cmdline Modify location

Q: Rong Product s5p6818 Development Board, Ubuntu version, uboot kernel cmdline where to change?
ROOT=/DEV/MMCBLK0P7, I want to change into ROOT=/DEV/MMCBLK0P4.
A:kernel,
Make Arch=arm Menuconfig,
Boot options.
Q: There is no specified ROOT=/DEV/MMCBLK0P7,
Using the bootloader, if the bootloader is to pass the argument,
The Uboot env is ROOT=/DEV/MMCBLK0P1, and the cmdline in Kernel's config does not specify ROOT=/DEV/MMCBLK0P7,
and kernel in the init=/init, the actual kernel log is shown as INIT=/INITRC,
Certainly not Kernel's config in config_cmdline.

A: Don't change uboot.

Q: I am wrong, I use the IMG is you update the use of eMMC, look at the code is the previous.

Rongping s5p6818 Development Board Ubuntu version in Uboot cmdline Modify location