main.c

AT91RM9200的一级boot

#include <at91rm9200.h>

extern void AT91F_DBGU_Printk(char *);
extern char _stext,_etext,_sdata,_edata;

#define SRC 0x10020000   // U-BOOT 在FLASH中的起始地址
#define DST 0x21f00000   // U-BOOT 载入SDRAM地址
#define LEN 0x20000

#define LED1	AT91C_PIO_PB8
#define LED2	AT91C_PIO_PB15
#define LED3	AT91C_PIO_PB16
#define LED4	AT91C_PIO_PB17


void decompress_image_led_on(AT91PS_PIO pPio,unsigned int flag)
{
	pPio->PIO_CODR = flag;
}

void decompress_image_led_off(AT91PS_PIO pPio,unsigned int flag)
{
	pPio->PIO_SODR = flag;
}

void AT91F_PIO_CfgOutput(AT91PS_PIO pPio,unsigned int pioEnable)
{
	pPio->PIO_PER = pioEnable;
	pPio->PIO_OER = pioEnable;
	pPio->PIO_SODR = pioEnable;

}
void boot() {
  int i;
  char* ptr=(char*)DST;
  
  AT91F_PIO_CfgOutput(AT91C_BASE_PIOB,LED1|LED2|LED3|LED4);	//配置GPIO为输出
  
  for(i=0;i<LEN;i++) ptr[i]=0;
  AT91F_DBGU_Printk("\n\r");
  AT91F_DBGU_Printk("*********************************\n\r");
  AT91F_DBGU_Printk("** Welcome to ATMEL AT91RM9200 **\n\r");
  AT91F_DBGU_Printk("*********************************\n\r");
  
  decompress_image_led_on(AT91C_BASE_PIOB,LED1);
  
  decompress_image(SRC,DST,LEN);// 解压u-boot.bin.gz
  
  decompress_image_led_off(AT91C_BASE_PIOB,LED1);
  
  asm("mov pc,%0" : : "r" (DST));
};
void recover(char* s) {
  for(;;);
};