pb-555 initialization issue

Hi,
   I programmed a start code(shown below) and compiled it using GNU
crosschain from "Macraigor".
/******************************************************************/
    .text
    .globl __start
    . = 0x100
__start:
    li    r0, 0x3002
    mtmsr     r0
    mtspr 27     r0

    lis    r0,0xfff08000@ha
    ori    r0, r0, 0xfff08000@l
    mtspr    638, r0

    li      r0, 0x0
    mtspr  560, r0

    /* ComCon0 = 65 */
    li    r9, 65
    lis  r10, 0x00305008@ha
    stw r9, 0x00305008@l(r10)

    /* ComCon1 = 0x000c
    li    r9, 0x000c
    lis  r10, 0x0030500a@ha
    stw r9, 0x0030500a@l(r10)

    /* Then output a character
     * ComData = 0x50
     */
    li    r3, 0x50
    lis  r10, 0x0030500e@ha
    stw r3, 0x0030500e@l(r10)
/************************************************************************/

    Then I burn it into internal flash of MPC555, re-plug the power,
there is no character output, and I'm sure I configure the jumper
properly.
    So, can anyone help me?

environment:
axiom pb-555
CW8.1 for mpc5xx
P&E BDM cable

Best regards,
vai


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