[U-Boot] Clock frequency on a mx31 board

[alfred steele]

Hi,

The processor clock on the board i am using is  to 532Mhz. I want to
default it to 400(399) Mhz. I tried tweaking values in
include/configs/<boardname>.h file but with little success.
How do i change the frequency to 399 through the uboot code?

Thanks,
Alfred.