Lpc2000

I seem to be having problems trying to program my Phycore LPC2994
module when I use the GNU toolset.  I have tried using both JTAG and
the Philips utility, and neither of them will successfully program the
chip.  It will instead have the the previous program.  If I used the
Keil toolset I do not have this problem.  Does anyone have any
suggestions?  I am using uVision 3.

Thanks,
Peter