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我來貼我寫的9200的eeprom的bootload代碼
作者：masashinakayama　欄目：ARM技術(shù)
我來貼我寫的9200的EEPROM.html">EEPROM的bootload代碼
這是main.c
我寫的完整的bootload主要完成兩件事：1.配置寄存器，2.燒寫FLASH
雖然簡單了些，但是可以給大家參考一下，之前的1個匯編啟動文件和1個c初始化文件同ATMEL差不多，基本改了下SDRAM.html">SDRAM配置而已（我使用一片HY57V561620）
下面我改u-boot去嘍

#include "at91rm9200.h"
#include "lib_at91rm9200.h"

#define XMODEM_SOH    0x01
#define XMODEM_EOT    0x04
#define XMODEM_ACK    0x06
#define XMODEM_NAK    0x15
#define XMODEM_CAN    0x18
#define XMODEM_EOF    0x1A

#define AT91C_BASE_NCS0        0x10000000        //NCS0全部16位訪問
#define AT91C_BASE_SDRAM    0x20000000

extern void AT91F_DBGU_Printk(CHAR *buffer);
void DelayMS(unsigned SHORT time)            //ms等級定時,time=1..1000
{
    unsigned SHORT piv;
    piv=32768*time/1000;
    AT91C_BASE_ST->ST_PIMR=piv;
    while (!(AT91C_BASE_ST->ST_SR&AT91C_ST_PITS));
}

unsigned SHORT AT91F_CRC16(CHAR *ptr, int count)
{
    int crc = 0;
    CHAR i;
    while (--count >= 0)
    {
        crc = crc ^ (int) *ptr++ << 8;
        i = 8;
        do
        {
        if (crc & 0x8000)
            crc = crc << 1 ^ 0x1021;
        else
            crc = crc << 1;
        } while(--i);
    }
    return (crc);
}

int AT91F_Flash_ReadID()
{
    unsigned SHORT DeviceID;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0xAA;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x2AAA*2)=0x55;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0x90;
    DeviceID=*(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x1*2);
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x0000*2)=0xF0;
    return (DeviceID);
}

void AT91F_Flash_ChipErase()
{
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0xAA;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x2AAA*2)=0x55;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0x80;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0xAA;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x2AAA*2)=0x55;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0x10;
    DelayMS(100);    //wait >50 ms
}

void At91F_Flash_Write(unsigned int addr,unsigned SHORT data)
{
    volatile SHORT TEMP;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0xAA;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x2AAA*2)=0x55;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+0x5555*2)=0xA0;
    *(volatile unsigned SHORT *)(AT91C_BASE_NCS0+addr*2)=data;
    while (1)
    {
        TEMP=*(volatile unsigned SHORT *)(AT91C_BASE_NCS0+addr*2);
        TEMP^=*(volatile unsigned SHORT *)(AT91C_BASE_NCS0+addr*2);
        if (!(TEMP&0x40)) break;
    }
}

unsigned CHAR AT91F_DBGU_GetChar()                //帶阻塞
{
    while (!AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU));
    return (AT91F_US_GetChar((AT91PS_USART)AT91C_BASE_DBGU));
}

void AT91F_DBGU_PutChar(unsigned CHAR c)        //帶阻塞
{
    while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
    AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU,c);
}
volatile int a,b;
int Main(void)
{
    unsigned CHAR     bIsFlashReady=0,
                    bIsXmodemReady=0,
                    bIsFileReady=0,
                    bIsVerifyOK=1;
    volatile unsigned CHAR c;
    unsigned SHORT    crc16;
    unsigned int i,block=0;
    
    AT91F_DBGU_Printk("\n\r\n\r");
    AT91F_DBGU_Printk("******************************\n\r");
    AT91F_DBGU_Printk("*     ZT9200 EEPROM BIOS     *\n\r");
    AT91F_DBGU_Printk("*          VER 1.0           *\n\r");
    if (AT91F_Flash_ReadID()==0x234b)
    {    AT91F_DBGU_Printk("*      NCS0=SST39VF1601      *\n\r");
        AT91F_DBGU_Printk("*     Download by Xmodem     *\n\r");
        bIsFlashReady=1;
    }    
    else
    {
        AT91F_DBGU_Printk("*        NCS0=UNKNOWN        *\n\r");
        bIsFlashReady=0;
    }
    AT91F_DBGU_Printk("******************************\n\r");
    if (!bIsFlashReady) while(1);
    
    // 下面開始執(zhí)行讀文件入SDRAM,協(xié)議為Xmodem
    while (!bIsXmodemReady)
    {
        AT91F_DBGU_PutChar('C');
        AT91C_BASE_ST->ST_PIMR=0;        //等待時間為兩秒
        while (!(AT91C_BASE_ST->ST_SR&AT91C_ST_PITS))
            if (AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU))
            {
 &nb
2樓： >>參與討論
roosvelt
支持一下！
 
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leifeng
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