flash.c

可以在三星的ARM处理器s3c44b0上移植的bootLoader源代码

/****************************************************************************/
//
// FLASH burnning functions used in burn.c
// Created by Strong Embeded Studio
//         www.8800.org
// If there are any concerns on the code
// go to www.8800.org for discussion
//
/****************************************************************************/

typedef int  uint; 

//
// Change the type here
//
//#define type       F39SST160
#define   type       F29LV160T

#define F39SST160   100
#define F29LV160T   101

// 
// Define the FLASH sector structure
//
static uint SecData[] = {
//
// 29LV160T
//
  F29LV160T, 0x000,
  0x004000, 0x001,
  0x002000, 0x002,
  0x008000, 0x001,
  0x010000, 0x01F,
//
// 39SST160
//
  F39SST160, 0x000,
  0x001000, 0x200,
//
// End
//
  0x000000, 0x000
};

//
// Get the sector index from the offset
//
uint GetIndex(uint offset)
{
  if (type == F39SST160) {
    return ((offset)/(0x1000));
  } else {
    if (offset < 0x4000)
      return 0;
    else if (offset < 0x6000)
      return 1;
    else if (offset < 0x8000)
      return 2;
    else if (offset < 0x10000) 
      return 3;  
    else {
      return ((offset - 0x10000)/0x10000) + 4;
    }
  }
  return 0;
}

//
//
//
uint  GetSecAddr(uint index)
{
  uint i;
  uint sec;
  uint addr;
  
  addr = 0;
  i    = 0;
  sec  = 0;
  while (SecData[i]) {
    if (SecData[i]==type && SecData[i+1]==0) {
      i += 2;
	    while (SecData[i+1]) {
		    sec += SecData[i+1];
		    addr+= (SecData[i] * SecData[i+1]);
		    if (sec > index) {
			    addr -= (SecData[i] * (sec - index));
			    return addr;
		    }
		    i += 2;
	    }
	    return 0;
	  } else {
	    i += 2;
	    continue;
  	}
  }
  return 0;
}

#define FLASHBASEADDR 0
uint WriteSector(int index,char *data_buffer)
{
	volatile unsigned short *Dest;
	volatile unsigned short *Org;
	uint     len=0,i;
		
	len       = GetSecAddr(index+1)-GetSecAddr(index);
	Org       = (volatile unsigned short *)data_buffer;
	Dest      = (volatile unsigned short *)(FLASHBASEADDR+GetSecAddr(index));

	*(volatile unsigned short *)(0x0000AAAA)=0xAAAA;
	*(volatile unsigned short *)(0x00005554)=0x5555;
	*(volatile unsigned short *)(0x0000AAAA)=0x8080;
	*(volatile unsigned short *)(0x0000AAAA)=0xAAAA;
	*(volatile unsigned short *)(0x00005554)=0x5555;
	*Dest                 =0x3030;
	while ((*Dest)!=0xFFFF);
	
	if (!data_buffer) return 0;
	
	for (i=0;i<len/2;i++)
	{
	  *(volatile unsigned  short *)(0x0000AAAA)=0xAAAA;
	  *(volatile unsigned  short *)(0x00005554)=0x5555;
	  *(volatile unsigned  short *)(0x0000AAAA)=0xA0A0;
		*(Dest+i)=*(Org+i);
		while ((*(Dest+i))!=(*(Org+i)));
	}
	
  for (i=0;i<len/2;i++)
  {
   	if ((*(Dest+i))!=(*(Org+i))) 
   	{
   		return 0;
   	}
  }
	
	return len;
}