2410loader.c

这是基于S3C2410板子的VIVI启动代码,仿照此文件夹中所含文件可以写出低于4K的的有针对性的BOOTLOADER,是严格控制启动代码大小的不二之选

/************************************************
 * NAME    : 2410loader.C			*
 * DESC    : 					*
 * History : 2002.02.25 ver 0.0			*
************************************************/

#include <stdlib.h>
#include <string.h>
#include "option.h"
#include "def.h"
#include "2410addr.h"
#include "2410slib.h"
#include "2410addr.h"
#include "k9s1208.h"
#include "mmu.h"

#define DOWNLOAD_ADDRESS _RAM_STARTADDRESS
#define LED_ON	0xa
#define LED_OFF	0x0
#define OS_IMAGE_SIZE 830

void (*run)(void)=(void (*)(void))(DOWNLOAD_ADDRESS+0x200000);
void Port_Init(void);
void Led_Display(int);
void Delay(int);

volatile unsigned char *downPt;

void T4_Start(void);
void T4_Stop(void);
char *hex2char(int val);


void Main(void)
{
    register i,j;
    
    MMU_EnableICache();
#if ADS10   
//    __rt_lib_init(); //for ADS 1.0
#endif
    
    ChangeClockDivider(1,1);	    // 1:2:4
    ChangeMPllValue(0x5c,0x4,0x0);  //Fin=12MHz FCLK=200MHz
        
    Port_Init();

    Uart_Init(PCLK, 115200);
    downPt=(unsigned char *)DOWNLOAD_ADDRESS+0x200000;

    NF_Init();

    Led_Display(LED_OFF);
    T4_Start();
       	
    j=0;
    while(j<(OS_IMAGE_SIZE))	    // Read 1~807 block(13635072B) for WinCE image
    {
	j++;
	for(i=0;i<32;i++)   // Read 32 page
	{
	    if(!NF_ReadPage(j, i, (U8 *)downPt))  //(U32 block,U32 page,U8 *buffer)
	    {
		if(i!=0)
		{
		    Led_Display(0x8);   // real ECC Error
		    while(1);
		}
		break;		    // ECC error is considered as a bad block.
	    }
  	    downPt += 512;	    // Next page
	}
    }
    Led_Display(LED_ON);
 
    T4_Stop();

    run();
}



void T4_Start(void)
{
    Uart_SendString("\n\nNAND Boot Start\n");
    
    rTCFG0=0xff00;
    rTCFG1=(0x3<<16); //T4=16/256
    rTCNTB4=0xffff;
    rTCON=(1<<22)|(1<<21);  //Manual update
    rTCON=(1<<22)|(1<<20);  //Start T4
    
    
}

void T4_Stop(void)
{
    int cnt;
    rTCON=(1<<22)|(0<<20);  //Stop T4
    cnt=0xffff-rTCNTO4;
    Uart_SendString("NAND Boot End\n");
    Uart_SendString("Boot time=nTCNT*82uS. nTCNT=0x");
    Uart_SendString(hex2char((cnt&0xf000)>>12));
    Uart_SendString(hex2char((cnt&0x0f00)>>8));
    Uart_SendString(hex2char((cnt&0x00f0)>>4));
    Uart_SendString(hex2char((cnt&0x000f)>>0));    	
    Uart_SendString("\n\n");
}


char *hex2char(int val)
{
    static char str[2];
    str[1]='\0';	
    if(val<=9)str[0]='0'+val;
    else str[0]=('a'+val-10);
    return str;
}