OK6410的2G MLC NAND问题三个解决办法

主要注意点有三个：

1.时间参数需要更改一下，可以都设置为7

/* 设置时间参数 */

#define TACLS     0

#define TWRPH0   2
#define TWRPH1   1

2.6410中，nand里面的前4页，每页只存了2k，所以读的时候需要注意

3.当然了，将程序烧入nand时也需要注意第2点了，在ok6410可以用命令nand write.uboot命令来做，这个命令会在前面4页的时候，只写入2k的数据。

附上代码，虽然代码不太严谨，但可以参考


#define MEM_SYS_CFG     (*((volatile unsigned long *)0x7E00F120))
#define NFCONF          (*((volatile unsigned long *)0x70200000))
#define NFCONT          (*((volatile unsigned long *)0x70200004))
#define NFCMMD          (*((volatile unsigned long *)0x70200008))
#define NFADDR          (*((volatile unsigned long *)0x7020000C))
#define NFDATA          (*((volatile unsigned char *)0x70200010))
#define NFSTAT          (*((volatile unsigned long *)0x70200028))


void nand_select(void)
{

NFCONT &= ~(1<<1);
}


void nand_deselect(void)
{

NFCONT |= (1<<1);
}


void nand_cmd(unsigned char cmd)
{

NFCMMD = cmd;
}


void nand_addr(unsigned char addr)
{

NFADDR = addr;
}


unsigned char nand_get_data(void)
{

return NFDATA;
}


void nand_send_data(unsigned char data)
{

NFDATA = data;
}


void wait_ready(void)
{

while ((NFSTAT & 0x1) == 0);
}


void nand_reset(void)
{

/* ???D */

nand_select();



/* ·￠3?0xff?üá? */

nand_cmd(0xff);



/* μè?y?íD÷ */

wait_ready();



/* è??????D */

nand_deselect();
}


void nand_init(void)
{

/* è?xm0csn2ó?×÷nand flash cs0 ????òy?? */

MEM_SYS_CFG &= ~(1<<1);



/* éè??ê±??2?êy */
#define TACLS     0
#define TWRPH0    2
#define TWRPH1    1

NFCONF &= ~((1<<30) | (7<<12) | (7<<8) | (7<<4));

NFCONF |= ((TACLS<<12) | (TWRPH0<<8) | (TWRPH1<<4));



/* ê1?ünand flash controller */

NFCONT |= 1;

NFCONT &= ~(1<<16); /* é-?1soft lock */

nand_reset();
}


void nand_send_addr(unsigned int addr)
{
#if 1


unsigned int page   = addr / 4096;

unsigned int colunm = addr & (4096 - 1);



/* ?aá???μ??·±íê??óò3?ú??à??aê? */

nand_addr(colunm & 0xff);

nand_addr((colunm >> 8) & 0xff);



/* ????èy??μ??·±íê???ò?ò3 */

nand_addr(page & 0xff);

nand_addr((page >> 8) & 0xff);

nand_addr((page >> 16) & 0xff);
#else

nand_addr(addr & 0xff);         /* a0~a7 */

nand_addr((addr >> 8) & 0x1f);   /* 3ìDòμ????è: a8~a12 */

nand_addr((addr >> 13) & 0xff); /* 3ìDòμ????è: a13~a20 */

nand_addr((addr >> 21) & 0xff); /* 3ìDòμ????è: a21~a28 */

nand_addr((addr >> 29) & 0x7); /* 3ìDòμ????è: a29   ~ */
#endif
}


int nand_read(unsigned int nand_start, unsigned int ddr_start, unsigned int len)
{

unsigned int addr = nand_start;

int i = nand_start % 4096;

int left = i;

int count = 0;

unsigned char *dest = (unsigned char *)ddr_start;

unsigned char data = 0;



/* ???DD??? */

nand_select();



while (count < len)

{

/* ·￠3??üá?0x00 */

nand_cmd(0x00);



/* ·￠3?μ??· */

nand_send_addr(addr);



/* ·￠3??üá?0x30 */

nand_cmd(0x30);



/* μè?y?íD÷ */

wait_ready();



/* ?áêy?Y */

for (; i < (4096-left) && count < len; i++)

{

data = nand_get_data();

if(addr<16384)

{


   if(i<(2048-left))


   {

dest[count++] = data;


   }

}

else

{


   dest[count++] = data;

}



//dest[count++] = nand_get_data();

addr++;


}

i = 0;


left = i;


}



/* è??????? */

nand_deselect();



return 0;
}


int nand_erase_block(unsigned long addr)
{

int page = addr / 4096;

nand_select();

nand_cmd(0x60);

nand_addr(page & 0xff);

nand_addr((page >> 8) & 0xff);

nand_addr((page >> 16) & 0xff);

nand_cmd(0xd0);

wait_ready();

nand_deselect();
}


int nand_write(unsigned int nand_start, unsigned char * buf, unsigned int len)
{

unsigned long count = 0;

unsigned long addr  = nand_start;

int i = nand_start % 4096;

int left = i;



nand_select();

while (count < len)

{

nand_cmd(0x80);

nand_send_addr(addr);

for (; i < (4096-left) && count < len; i++)

{

if(addr<16384)

{


   if(i<(2048-left))


   {

nand_send_data(buf[count++]);


   }

}

else

{


   nand_send_data(buf[count++]);

}

//nand_send_data(buf[count++]);

addr++;

}



nand_cmd(0x10);

wait_ready();

i = 0;

left = i;


}

nand_deselect();
}


int copy2ddr(unsigned int nand_start, unsigned int ddr_start, unsigned int len)
{

int ret;



/* 3?ê??ˉnand flash controller */

nand_init();



/* ?ánand flash */

ret = nand_read(nand_start, ddr_start, len);



return ret;
}