I would like to compile radeonfb in my kernel but with specific timings as default in order to support a 15Khz arcade monitor.

In other words I would like to do this but compiled in the kernel :

modprobe radeonfb
fbset -g 640 248 640 496 16 -t 69259 136 72 17 0 64 2

Can you help me or tell me who can help.
Many thanks in advance.