[U-Boot-Users] How to add Timer Interrupt to u-boot?

Hello all:

Everybody knows how to add Timer Interrupt to the u-boot? I wrote a fuction called timer0_isr(), and wanted to add it to Uboot, but I didn't know what to do, Does the uboot has a funciton like function request_irq() in linux kernel? Thanks in advance!

With kind regards,

Robert Xia