[U-Boot-Users] Debug U-Boot with BDI2000 (Dongyan Chai)

I am debugging the u-boot(1.1.1) with BDI2000.

I set only one breakpoint in ddd as: (gdb)b nand_probe then I typed: (gdb)c (gdb)n (gdb)n at this point, the gdb hung. At the bdi2000 telnet window, the follow message appeared: "# TARGET: all hardware breakpoints in use"

Why and how can I resolve this problem?

Regards, Dongyan Chai