GDB debugger

Hi there, My project is based on LPC2368 controller and iam using Keil uVision3 IDE with the GNU compiler. My code size exceeds 16kB. Hence, iam unable to use
the Keil Debugger with Ulink2 JTAG debugger.

I would like to know if it is possible to use the GDB debugger instead.
Kindly give your valuable suggestions.