Embeded linux 之 mtd nand

应用层：(运用mtd ioctl)

0.获取mtd基本信息

struct mtd_info_user {
unsigned char type;　　//flash类型
unsigned int flags;　　  
unsigned int size; 　　  //分区巨细
unsigned int erasesize; //块巨细
unsigned int writesize;  //页数据巨细
unsigned int oobsize;    //OOB巨细
unsigned int ecctype;   //ECC类型
unsigned int eccsize;    //ECC巨细
};

fd = open(“/dev/mtd”, O_RDWR);

ioctl(fd, MEMGETINFO, &mtd_info);

1.读页数据

2.写页数据

unsigned char pagedate[2048] = {…};

write(fd, pagedate, mtd_info.writesize);

3.读OOB

struct mtd_oob_buf {
unsigned int start;
unsigned int length;
unsigned char *ptr;
};

unsigned char oobbuf2[64];

OOB_INFO.start = page_num * (2048);
OOB_INFO.ptr = oobbuf2;
ioctl(fd, MEMREADOOB, &OOB_INFO);

4.写OOB

unsigned char oobbuf[64] = {…};

OOB_INFO.start = page_num * (2048);
OOB_INFO.ptr = oobbuf;
ioctl(fd, MEMWRITEOOB, &OOB_INFO);

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