sanosclib.c

三星 S3C2410 开发板 LCD测试配套程序

// file: SanOSclib.c
// by  : Sanicle
// ver : 2005.03.20
// from: http://3mn.net

#include <stdlib.h>
#include <string.h>
#include "def.h"
#include "2410lib.h"
#include "SanOSlib.h"

DWORD ReadNandOS()
{
	// This fuction load OS from NandFlash to SDRAM

	DWORD dwSector, dwLength;		// Start Sector & Length
    DWORD dwRAM;					// This value is SanOS' Base Address in SDRAM
    
    rNFCONF = 0xF830;				// Init NandFlash
    
    dwRAM=0x30000000;
    				
    dwSector=0x00000040;			
    	// if 4096 blocks, 0x40 here is block 2 (start from 0)
    	// cause 512B*0x40=0x20kB
    dwLength=0x00000100;
    	// 0x00000100 is 128k
    
	while (dwLength) 
	{
    	DWORD		i, r = 0; 			// for loop
    	BYTE		ecc0,ecc1,ecc2;		// ecc check
    	BOOL		rc = TRUE;			 
    	ECCRegVal	eccRegVal;

_again:
    	//  Initialize ECC register
    	rNFCONF |= (1<<12); 

    	//  Enable the chip
    	rNFCONF &= ~(1<<11);   
    
    	// Issue Read command
    	rNFCMD  = 0x00;

    	//  Set up address
   		rNFADDR = 0x00;
    	rNFADDR = ((dwSector) & 0xff);
    	rNFADDR = ((dwSector >> 8) & 0xff);
    	rNFADDR = ((dwSector >> 16) & 0xff);

    	for (i = 0; i < 5; i++);	// wait tWB(100ns)
    	while(!(rNFSTAT&(1<<0)));	// wait tR(max 12us)

    	// read data in nandFlash
    	__SanReadFlash512((LPBYTE)dwRAM);

		//	Read the ECC from ECC Register
		eccRegVal.dwECCVal = rNFECC;
	
		//	Skip first 8 bytes
		for(i=0; i<8; i++)
		{
			ecc0 = rNFDATA;
		}
		ecc0 = rNFDATA;
		ecc1 = rNFDATA;
		ecc2 = rNFDATA;
	
    	rNFCONF |= (1<<11);

    	if ( !rc && r++ < 10 )
    	{
        	//Uart_SendString("Read Sector: ");
        	//Uart_SendDWORD(dwSector, TRUE);
        	
        	// NandFlash Reset
    		rNFCONF &= ~(1<<11);          
    		rNFCMD  = 0xff;  
    		while(!(rNFSTAT&(1<<0)));        
    		rNFCONF |= (1<<11);
     
        	for (i = 0; i < 5; i++);	// delay
        	rc = TRUE;
        	goto _again;
    	}
    
		if(	ecc0 != eccRegVal.bECCBuf[0] ||
			ecc0 != eccRegVal.bECCBuf[0] ||
			ecc0 != eccRegVal.bECCBuf[0] )  
		{
			//Uart_SendString("ECC mismatch for Sector: ");
			//Uart_SendDWORD(dwSector, TRUE);
			rc = FALSE;
		}
		
		dwSector++;
    	dwLength--;
    	dwRAM += SECTOR_SIZE;
	}
	return 0x30000000;	// dwRAW init value, SanOS launch address
}