Gnuarm to Codesourcery toolchain help

I tried to port some code from the gnuarm.com toolchain to the
codesourcery one.  The code compiles ok, and I can program my LPC2148
chip, but the timer/interrupt code doesn't seem to be working.

I have a LPC2148 Olimex development board I have been trying to learn
how to program using linux/openocd.  I got the timer demo from
"Accessing ARM-Controllers with OpenOCD"
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/openocd_intro/index.html
working with gnuarm (from gnuarm.com gcc v3.4.3 binary).  I changed the
programs in the makefile from arm-elf-* to arm-none-linux-gnueabi-* to
use the codesourcery toolchain.  It compiles ok and I can program the
chip, but the pins don't change value.  (I have LEDs hooked up to a
couple of the output pins).

If I don't use the timer, and just use a counter, the code works ok. ie:
int main (void)
{
  int flip;
  DWORD lasttime, now;
  int counter;

  /************ The main Function is an endless loop ************/
  /* The timer routine is tested on the Keil MCB214x board */

  // ...and on an Keil MCB2130 by Martin Thomas

  IODIR1 = 0x00FF0000;    /* P1.16..23 defined as Outputs */
  IOCLR1 = 0x00FF0000;    /* turn off all the LEDs */
  IOSET1 = 0x00AA0000;        /* turn on some LEDs to indicate start */

  //init_VIC();
  //init_timer();

  //enable_timer( 0 );

  flip = 0;
  lasttime = timer_counter;
  counter = 0;
  while (1) {  /* Loop forever */
    //now = timer_counter;
    //if ( (DWORD)(now-lasttime) > 0x100 ) {
    //  lasttime = now;
    if( ++counter > 10000000 ) {
      counter = 0;

      if (flip == 0) {
        IOSET1 = 0x000F0000;  /* turn off P1.20~23 */
        IOCLR1 = 0x00F00000;  /* turn on P1.16~19 */
        flip = 1;
      }
      else {
        IOSET1 = 0x00F00000;  /* turn on P1.20~23 */
        IOCLR1 = 0x000F0000;  /* turn off P1.16~19 */
        flip = 0;
      }
    }
  }
  return 0;
}

So is there something with interrupts or the timer which is different in
gnuarm vs codesourcery?  Or am I missing something else?


Side note: in the latest svn version of openOCD, the flash erase_sector
and write_bank commands worked for me.  Thanks Martin! =)