rtel wrote on Thursday, July 14, 2011:
Well there could be one of twenty different things. From a three line description of what you have done I can only speculate on the most likely - and that would be that you have not populated the interrupt vector table correctly. Look at the other Cortex-M3 GCC demos - you need to populate the PendSV, SysTick and SVC interrupts with xPortPendSVHandler, vPortSysTickHandler and vPortSVCHandler respectively.
If your project is using CMSIS, then you can map these to the CMSIS names by adding the following lines to FreeRTOSConfig.h, then including FreeRTOSConfig.h in the file that defines the vector table.
#define vPortSVCHandler SVC_Handler
#define xPortPendSVHandler PendSV_Handler
#define xPortSysTickHandler SysTick_Handler