u-Boot setting clock speeds

I'm really clueless when it comes to setting the CPU speed properly. I managed to figure out enough to get the CPU set to 266mhz on a S3C2410 board but it appears the other speeds are not set correctly. Could anyone tell me how to get the following set? The more you can explain, the better, but I realize not everyone has the time to explain in detail.

FCLK = 266 MHz, HCLK = 133 MHz, PCLK = 66 MHz, UCLK = 48 MHz

Here's what I have in the u-Boot board config so far

#define M_MDIV 0x7d
#define M_PDIV 0x1
#define M_SDIV 0x1

#define U_M_MDIV 0x78
#define U_M_PDIV 0x2
#define U_M_SDIV 0x3

Thanks!