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ARM-RTX on LPC2888

Widita Budhysutanto

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

  • 0

    Here is my disassembly tracks:
    inside os_sys_init() function call:

    0x10401B5C  E28FC001  ADD       R12,PC,#0x00000001
0x10401B60  E12FFF1C  BX        R12
                 os_sys_init_user:
0x10401B64  B570      PUSH      {R4-R6,LR}
0x10401B66  4C1E      LDR       R4,[PC,#0x0078]
0x10401B68  6060      STR       R0,[R4,#0x04]

{VALUE of R12} when executing "BX R12" is 0x10401B65


    and after executing BX R12, the processor directly goes to Prefetch Abort state,

    Is there something wrong with my stack settings? or something wrong with the ARM/Thumb interworking settings?

    Can someone please help me,
    what can I do to fix this?

    Thanks