[U-Boot] Need some help setting default DRAM clock to a lower value

[Ratin]

Hi I am working on a project with cubie2 boards loading linux (Patricks nand 
boot loader patch, and kernel 3.3.0+ and ubuntu linaro 13.04 distro). I have 
met with stability issues (lock-up) and as I dug deeper, a number of other 
people have also complained about lockup issue relating to high DRAM clock 
(480 Mhz), as mentioned here 

https://groups.google.com/forum/#!topic/cubieboard/9WMBFAL7JBE

and here: 

https://groups.google.com/forum/#!topic/linux-sunxi/hw0yyWFVYgM


As mentioend, a lower value of DRAM clock seems to fix the problem, however I 
am not finding a way to do this (I am booting from NAND). I have edited 
script.bin, but it does not read the changed values. I also compiled a new 
boot.axf after putting 384Mhz values in the file 
boot1/core/start/eCon2_Start.c

    default_clock = eGon2_clock_set(0, 384);
    default_clock = 384;

but to no avail as I moved the boot.axf file over, no change. I noticed 
binaries from core gets compiled into a boot1_nand.bin file, how is this used 
in the nand boot loading process? 

I am working with the lichee-a20-dev branch.

Can anybody help? Thanks