nm wrote:

Hi all, I'm newbie w/ jtag stuff. I'm trying to hack u-boot, but i have some problem.

It is possible to debug u-boot on AT91RM9200 w/ wiggler jtag cable ?

Think so: http://www.denx.de/wiki/view/DULG/Debugging

Also you maybe be interested at OpenOCD: http://openocd.berlios.de http://www.fh-augsburg.de/~hhoegl/proj/openocd/index.html