ARM-RTX on LPC2888

Hi all,
I tried to port one of RTX demos which is based on MCB2300 to my LPC2888 board my modifying the RTX_Config.c
And I used my old startup.s (with modification of importing SWI_Handler).

But as soon as I called the os_sys_init() function, the ARM7 core hangs on this line of startup.s
PAbt_Handler B PAbt_Handler

From my googling, I found out that Prefetch Abort exception occurs when the processor tried to read an instruction in a non existing memory address,
What did I do wrong?

Thanks

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