s3c2440's register: MRSR6

[niqingliang2003 at gmail.com]

Hello, I compiled barebox (based on mini2440).
and start from nand, can't start normally,
after changed MRSRB6 to 0x30, ok.

I have checked uboot, it does use 0x30 for mini2440.
but barebox use 0x20 (work on mini2440, but not work on my 2442 
board).

what does it depend on?
in other words, what does the CL value depend on?

'BOARD_SPECIFIC_MRSRB6'

Nanjing Jilong
Yi Qingliang