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问 这是main.c
我写的完整的 bootload主要完成两件事：1.配置寄存器，2.烧写flash
虽然简单了些，但是可以给大家参考一下，之前的1个汇编启动文件和1个c初始化文件同atmel差不多，基本改了下sdram配置而已（我使用一片hy57v561620）
下面我改u-boot去喽

#include "at91rm 9200.h"
#include "lib_at91rm 9200.h"

#define XMODEM_SOH 0x01
#define XMODEM_EOT 0x04
#define XMODEM_ACK 0x06
#define XMODEM_NAK 0x15
#define XMODEM_ CAN0x18
#define XMODEM_EOF 0x1A

#define AT91C_BASE_NCS0 0x10000000 //NCS0全部16位访问
#define AT91C_BASE_SDRAM 0x20000000

extern void AT91F_DBGU_Printk(char *buffer);
void DelayMS(unsigned short time) //ms等级定时,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() //带阻塞
{
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) //带阻塞
{
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("* ZT 9200EEPROM 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);

// 下面开始执行读文件入SDRAM,协议为Xmodem
while (!bIsXmodemReady)
{
AT91F_DBGU_PutChar('C');
AT91C_BASE_ST->ST_PIMR=0; //等待时间为两秒
while (!(AT91C_BASE_ST->ST_SR&AT91C_ST_PITS))
if (AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU))
{
bIsXmodemReady=1;
break;
}
}
while(!bIsFileReady)
{
c=AT91F_DBGU_GetChar();
if (c==XMODEM_SOH)
{
c=AT91F_DBGU_GetChar();
c=~c;
if (c!=AT91F_DBGU_GetChar()) while(1);
for (i=0;i<128;i++)
{
c=AT91F_DBGU_GetChar();
*(volatile char *)(AT91C_BASE_SDRAM+i+128*block)=c;
}
crc16=AT91F_DBGU_GetChar();
crc16=(crc16<<8)+AT91F_DBGU_GetChar();
if (crc16==AT91F_CRC16((char *)(AT91C_BASE_SDRAM+block*128),128))
{
block++;
AT91F_DBGU_PutChar(XMODEM_ACK);
}
else
{
AT91F_DBGU_PutChar(XMODEM_NAK);
}
}
else if (c==XMODEM_EOT)
{
AT91F_DBGU_PutChar(XMODEM_ACK);
bIsFileReady=1;
}
}

// 下面开始执行烧写flash
if (block>16384)
{
AT91F_DBGU_Printk("\n\rFile is too big for SST39VF1601\n\r");
while(1);
}
AT91F_DBGU_Printk("\n\rStart erasing and writing flash");
AT91F_Flash_ChipErase();
for (i=0;i{
At91F_Flash_Write(i>>1,*(volatile unsigned short *)(i+AT91C_BASE_SDRAM));
if (i%128==0) AT91F_DBGU_PutChar('.');
}
AT91F_DBGU_Printk("OK!\n\r");

// 下面开始校验数据
AT91F_DBGU_Printk("Start verifying data");
for (i=0;i{
a=*(volatile unsigned short *)(i+AT91C_BASE_SDRAM);
b=*(volatile unsigned short *)(i+AT91C_BASE_NCS0);
if (a!=b)
{
bIsVerifyOK=0;
break;
}
if (i%128==0) AT91F_DBGU_PutChar('.');
}
if (bIsVerifyOK)
AT91F_DBGU_Printk("OK!\n\r");
else
AT91F_DBGU_Printk("Failed!\n\r");

AT91C_BASE_PIOA->PIO_SODR=AT91C_PIO_PA19;
DelayMS(100);
AT91C_BASE_PIOA->PIO_CODR=AT91C_PIO_PA19;
while(1)
{
AT91C_BASE_PIOB->PIO_SODR=AT91C_PIO_PB0;
DelayMS(500);
AT91C_BASE_PIOB->PIO_CODR=AT91C_PIO_PB0;
DelayMS(500);
}
} 答 1: 支持一下！ 答 2: 厉害!