多谢各位指点！
我的启动方式是用ADS的bootloader，没使用到eboot
我把相关代码贴出来，如果以后有人遇到这个问题也好互相借鉴
void OEMPowerOff()
{
static UINT32 saveArea[51];
S3C2440A_INTR_REG *pIntr = (S3C2440A_INTR_REG*)OALPAtoVA (S3C2440A_BASE_REG_PA_INTR, FALSE);
S3C2440A_IOPORT_REG *pIOPort = (S3C2440A_IOPORT_REG*)OALPAtoVA(S3C2440A_BASE_REG_PA_IOPORT, FALSE);
S3C2440A_LCD_REG *pLCD = (S3C2440A_LCD_REG*)OALPAtoVA(S3C2440A_BASE_REG_PA_LCD, FALSE);
RETAILMSG(1, (TEXT("+OEMPowerOff Called \r\n")));
RETAILMSG(1, (TEXT("pIntr->INTMOD = 0x%x \r\n"), pIntr->INTMOD));
RETAILMSG(1, (TEXT("pIntr->INTMSK = 0x%x \r\n"), pIntr->INTMSK));
RETAILMSG(1, (TEXT("pIntr->INTSUBMSK = 0x%x \r\n"), pIntr->INTSUBMSK));
// Then save system registers
saveArea[0] = INPORT32(&pIOPort->GPACON);
saveArea[1] = INPORT32(&pIOPort->GPADAT);
saveArea[2] = INPORT32(&pIOPort->GPBCON);
saveArea[3] = INPORT32(&pIOPort->GPBDAT);
saveArea[4] = INPORT32(&pIOPort->GPBUP);
saveArea[5] = INPORT32(&pIOPort->GPCCON);
saveArea[6] = INPORT32(&pIOPort->GPCDAT);
saveArea[7] = INPORT32(&pIOPort->GPCUP);
saveArea[8] = INPORT32(&pIOPort->GPDCON);
saveArea[9] = INPORT32(&pIOPort->GPDDAT);
saveArea[10] = INPORT32(&pIOPort->GPDUP);
saveArea[11] = INPORT32(&pIOPort->GPECON);
saveArea[12] = INPORT32(&pIOPort->GPEDAT);
saveArea[13] = INPORT32(&pIOPort->GPEUP);
saveArea[14] = INPORT32(&pIOPort->GPFCON);
saveArea[15] = INPORT32(&pIOPort->GPFDAT);
saveArea[16] = INPORT32(&pIOPort->GPFUP);
saveArea[17] = INPORT32(&pIOPort->GPGCON);
saveArea[18] = INPORT32(&pIOPort->GPGDAT);
saveArea[19] = INPORT32(&pIOPort->GPGUP);
saveArea[20] = INPORT32(&pIOPort->GPHCON);
saveArea[21] = INPORT32(&pIOPort->GPHDAT);
saveArea[22] = INPORT32(&pIOPort->GPHUP);
saveArea[23] = INPORT32(&pIOPort->MISCCR);
saveArea[24] = INPORT32(&pIOPort->DCLKCON);
saveArea[25] = INPORT32(&pIOPort->EXTINT0);
saveArea[26] = INPORT32(&pIOPort->EXTINT1);
saveArea[27] = INPORT32(&pIOPort->EXTINT2);
saveArea[28] = INPORT32(&pIOPort->EINTFLT0);
saveArea[29] = INPORT32(&pIOPort->EINTFLT1);
saveArea[30] = INPORT32(&pIOPort->EINTFLT2);
saveArea[31] = INPORT32(&pIOPort->EINTFLT3);
saveArea[32] = INPORT32(&pIOPort->EINTMASK);
saveArea[33] = INPORT32(&pIntr->INTMOD);
saveArea[34] = INPORT32(&pIntr->INTMSK);
saveArea[35] = INPORT32(&pIntr->INTSUBMSK);
saveArea[36] = INPORT32(&pLCD->TCONSEL);
saveArea[37] = INPORT32(&pLCD->LCDINTMSK);
saveArea[38] = INPORT32(&pLCD->TPAL);
saveArea[39] = INPORT32(&pLCD->DITHMODE);
saveArea[40] = INPORT32(&pLCD->BLUELUT);
saveArea[41] = INPORT32(&pLCD->GREENLUT);
saveArea[42] = INPORT32(&pLCD->REDLUT);
saveArea[43] = INPORT32(&pLCD->LCDSADDR3);
saveArea[44] = INPORT32(&pLCD->LCDSADDR2);
saveArea[45] = INPORT32(&pLCD->LCDSADDR1);
saveArea[46] = INPORT32(&pLCD->LCDCON5);
saveArea[47] = INPORT32(&pLCD->LCDCON4);
saveArea[48] = INPORT32(&pLCD->LCDCON3);
saveArea[49] = INPORT32(&pLCD->LCDCON2);
saveArea[50] = INPORT32(&pLCD->LCDCON1);
/* LCD Controller Disable */
CPULCDOff();
// Switch off power for KITL device
OALKitlPowerOff();
/* Stop all GPIO */
ConfigStopGPIO();
/* Set misc register for power off */
ConfigMiscReg();
// Go to power off mode
OALCPUPowerOff();
// Switch on power for KITL device
OALKitlPowerOn();
/* Recover Process, Load CPU Regs */
OUTPORT32(&pIOPort->GPACON, saveArea[0]);
OUTPORT32(&pIOPort->GPADAT, saveArea[1]);
OUTPORT32(&pIOPort->GPBCON, saveArea[2]);
OUTPORT32(&pIOPort->GPBDAT, saveArea[3]);
OUTPORT32(&pIOPort->GPBUP, saveArea[4]);
OUTPORT32(&pIOPort->GPCCON, saveArea[5]);
OUTPORT32(&pIOPort->GPCDAT, saveArea[6]);
OUTPORT32(&pIOPort->GPCUP, saveArea[7]);
OUTPORT32(&pIOPort->GPDCON, saveArea[8]);
OUTPORT32(&pIOPort->GPDDAT, saveArea[9]);
OUTPORT32(&pIOPort->GPDUP, saveArea[10]);
OUTPORT32(&pIOPort->GPECON, saveArea[11]);
OUTPORT32(&pIOPort->GPEDAT, saveArea[12]);
OUTPORT32(&pIOPort->GPEUP, saveArea[13]);
OUTPORT32(&pIOPort->GPFCON, saveArea[14]);
OUTPORT32(&pIOPort->GPFDAT, saveArea[15]);
OUTPORT32(&pIOPort->GPFUP, saveArea[16]);
OUTPORT32(&pIOPort->GPGCON, saveArea[17]);
OUTPORT32(&pIOPort->GPGDAT, saveArea[18]);
OUTPORT32(&pIOPort->GPGUP, saveArea[19]);
OUTPORT32(&pIOPort->GPHCON, saveArea[20]);
OUTPORT32(&pIOPort->GPHDAT, saveArea[21]);
OUTPORT32(&pIOPort->GPHUP, saveArea[22]);
OUTPORT32(&pIOPort->MISCCR, saveArea[23]);
OUTPORT32(&pIOPort->DCLKCON, saveArea[24]);
OUTPORT32(&pIOPort->EXTINT0, saveArea[25]);
OUTPORT32(&pIOPort->EXTINT1, saveArea[26]);
OUTPORT32(&pIOPort->EXTINT2, saveArea[27]);
OUTPORT32(&pIOPort->EINTFLT0, saveArea[28]);
OUTPORT32(&pIOPort->EINTFLT1, saveArea[29]);
OUTPORT32(&pIOPort->EINTFLT2, saveArea[30]);
OUTPORT32(&pIOPort->EINTFLT3, saveArea[31]);
OUTPORT32(&pIOPort->EINTMASK, saveArea[32]);
OUTPORT32(&pIntr->INTMOD, saveArea[33]);
OUTPORT32(&pIntr->INTMSK, saveArea[34]);
OUTPORT32(&pIntr->INTSUBMSK, saveArea[35]);
pLCD->TCONSEL = saveArea[36];
pLCD->LCDINTMSK = saveArea[37];
pLCD->TPAL = saveArea[38];
pLCD->DITHMODE = saveArea[39];
pLCD->BLUELUT = saveArea[40];
pLCD->GREENLUT = saveArea[41];
pLCD->REDLUT = saveArea[42];
pLCD->LCDSADDR3 = saveArea[43];
pLCD->LCDSADDR2 = saveArea[44];
pLCD->LCDSADDR1 = saveArea[45];
pLCD->LCDCON5 = saveArea[46];
pLCD->LCDCON4 = saveArea[47];
pLCD->LCDCON3 = saveArea[48];
pLCD->LCDCON2 = saveArea[49];
pLCD->LCDCON1 = saveArea[50];
/* Interrupt Clear */
OUTPORT32(&pIOPort->EINTPEND, INPORT32(&pIOPort->EINTPEND));
OUTPORT32(&pIntr->SUBSRCPND, INPORT32(&pIntr->SUBSRCPND));
OUTPORT32(&pIntr->SRCPND, INPORT32(&pIntr->SRCPND));
OUTPORT32(&pIntr->INTPND, INPORT32(&pIntr->INTPND));
pLCD->LCDSRCPND = pLCD->LCDSRCPND;
pLCD->LCDINTPND = pLCD->LCDINTPND;
NANDInit();
OEMInitDebugSerial();
RETAILMSG(1, (TEXT("\r\n\r\n")));
RETAILMSG(1, (TEXT("pIntr->INTMOD = 0x%x \r\n"), pIntr->INTMOD));
RETAILMSG(1, (TEXT("pIntr->INTMSK = 0x%x \r\n"), pIntr->INTMSK));
RETAILMSG(1, (TEXT("pIntr->INTSUBMSK = 0x%x \r\n"), pIntr->INTSUBMSK));
// Do platform dependent power on actions
BSPPowerOn();
RETAILMSG(1, (TEXT("-OEMPowerOff Called \r\n")));
}
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