uboot 2008.10 No NAND device found!!! 0 MiB 问题的解决！

这个问题断断续续花费了几天时间才算彻底解决。用这么长时间解决这么个小问题，什么原因？分析一下，归咎与我代码阅读能力及调试能力太差。以前裁的UBOOT都是运行在nor的，而且裁了几次uboot都是照抄别人的手册，实在收获甚微。过去的惯性驱使我再次参照别人的手册修改代码，这次可没那么顺利。

在此要感谢tekkamanninja ，我是参照这个superman的手册修改的uboot 2008.10， tekkamanninja的文档没有这个版本的uboot，而uboot 2008.10版本较老，个别文件和新版uboot无法对应。抄起来还是有点难度的。

其中在tekkamanninja 文档中提到的s3c2410_nand.c文件，在uboot 2008.10版本里没有的，只好搜寻相关函数的踪迹，没s3c2410_nand.c至少也得找到到里面的函数吧，最后发现uboot 2008.10版本cpu/arm920t/s3c24X0/nand.c 文件里有相关函数的定义。。。

抄完手册，启动No NAND device found!!! 0 MiB god！失败

又重新对照手册，correct 启动仍旧打印

No NAND device found!!! 0 MiB

开始找这个问题原因很是茫然，百度，谷歌也没找到相关有效解决问题，哪里出问题了呢？最先想到的是

include/configs/micro2440.h 这个配置文件出了问题，于是仔细修改了一下，如下

#define CONFIG_CMD_NAND

#define CONFIG_ENV_IS_IN_NAND 1
//#define CONFIG_ENV_IS_IN_FLASH 1
#define CONFIG_ENV_OFFSET 0X60000
#define CONFIG_ENV_SIZE 0x20000

#if defined(CONFIG_CMD_NAND)
#define CMD_SAVEENV
#define CONFIG_NAND_S3C2410
#define CFG_NAND_BASE 0x4E000000
#define CFG_MAX_NAND_DEVICE 1 /* Max number of NAND devices */
#define SECTORSIZE 512
#define SECTORSIZE_2K 2048
#define NAND_SECTOR_SIZE SECTORSIZE
#define NAND_SECTOR_SIZE_2K SECTORSIZE_2K
#define NAND_BLOCK_MASK 511
#define NAND_BLOCK_MASK_2K 2047
#define NAND_MAX_CHIPS 1
#define CONFIG_MTD_NAND_VERIFY_WRITE
#define CONFIG_SYS_64BIT_VSPRINTF /* needed for nand_util.c */
#endif /* CONFIG_CMD_NAND */

?编译，启动

No NAND device found!!! 0 MiB

还是不行

然后在打印语句上下功夫，代码中搜No NAND device found!!!

找到了drivers/mtd/nand/nand_base.c 这个文件

int nand_scan_ident(struct mtd_info *mtd,int maxchips)
{
?int i,busw,nand_maf_id;
?struct nand_chip *chip = mtd->priv;
?struct nand_flash_dev *type;

?/* Get buswidth to select the correct functions */
?busw = chip->options & NAND_BUSWIDTH_16;
?/* Set the default functions */
?nand_set_defaults(chip,busw);

?/* Read the flash type */
?type = nand_get_flash_type(mtd,chip,&nand_maf_id);

?if (IS_ERR(type)) {
??printk(KERN_WARNING "No NAND device found!!!n");
??chip->select_chip(mtd,-1);
??return PTR_ERR(type);
?}

。。。

}

打印语句是从这里出来的，看看前后代码，nand_get_flash_type（）这个函数出了问题，在追踪这个函数

发现有这么一段

chip->select_chip(mtd,0);

?/* Send the command for reading device ID */
?chip->cmdfunc(mtd,NAND_CMD_READID,0x00,-1);

?/* Read manufacturer and device IDs */
?*maf_id = chip->read_byte(mtd);
?dev_id = chip->read_byte(mtd);
?printf("dev_id = %dn",dev_id);//这是我后来加上的，目的确认板子上读出的nandflash ID号
?/* Lookup the flash id */
?for (i = 0; nand_flash_ids[i].name != NULL; i++) {
??if (dev_id == nand_flash_ids[i].id) {
???type =? &nand_flash_ids[i];
???break;

编译打印，

No NAND device found!!!

dev_id = 16

0 MiB

16？找找定义ID为16的flash没? drivers/mtd/nand/nand_ids.c

struct nand_flash_dev nand_flash_ids[] = {

#ifdef CONFIG_MTD_NAND_MUSEUM_IDS
?{"NAND 1MiB 5V 8-bit",??0x6e,256,1,0x1000,0},
?{"NAND 2MiB 5V 8-bit",??0x64,2,
?{"NAND 4MiB 5V 8-bit",??0x6b,512,4,0x2000,
?{"NAND 1MiB 3,3V 8-bit",?0xe8,?0xec,
?{"NAND 2MiB 3,?0xea,
?{"NAND 4MiB 3,?0xd5,?0xe3,?0xe5,
?{"NAND 8MiB 3,?0xd6,8,

?{"NAND 8MiB 1,8V 8-bit",?0x39,?0xe6,
?{"NAND 8MiB 1,8V 16-bit",?0x49,NAND_BUSWIDTH_16},3V 16-bit",?0x59,
#endif

?{"NAND 16MiB 1,?0x33,16,0x4000,
?{"NAND 16MiB 3,?0x73,
?{"NAND 16MiB 1,?0x43,?0x53,

?{"NAND 32MiB 1,?0x35,32,
?{"NAND 32MiB 3,?0x75,
?{"NAND 32MiB 1,?0x45,?0x55,

?{"NAND 64MiB 1,?0x36,64,
?{"NAND 64MiB 3,?0x76,
?{"NAND 64MiB 1,?0x46,?0x56,

?{"NAND 128MiB 1,?0x78,128,
?{"NAND 128MiB 1,
?{"NAND 128MiB 3,?0x79,?0x72,?0x74,

?{"NAND 256MiB 3,?0x71,

?/*
? * These are the new chips with large page size. The pagesize and the
? * erasesize is determined from the extended id bytes
? */
#define LP_OPTIONS (NAND_SAMSUNG_LP_OPTIONS | NAND_NO_READRDY | NAND_NO_AUTOINCR)
#define LP_OPTIONS16 (LP_OPTIONS | NAND_BUSWIDTH_16)

?/*512 Megabit */
?{"NAND 64MiB 1,?0xA2,? 64,LP_OPTIONS},?0xF2,?0xB2,LP_OPTIONS16},?0xC2,

?/* 1 Gigabit */
?{"NAND 128MiB 1,?0xA1,?0xF1,?0xB1,?0xC1,

?/* 2 Gigabit */
?{"NAND 256MiB 1,?0xAA,
?{"NAND 256MiB 3,?0xDA,
?{"NAND 256MiB 1,?0xBA,?0xCA,

?/* 4 Gigabit */
?{"NAND 512MiB 1,?0xAC,
?{"NAND 512MiB 3,?0xDC,
?{"NAND 512MiB 1,?0xBC,?0xCC,

?/* 8 Gigabit */
?{"NAND 1GiB 1,?0xA3,1024,
?{"NAND 1GiB 3,?0xD3,
?{"NAND 1GiB 1,?0xB3,?0xC3,

?/* 16 Gigabit */
?{"NAND 2GiB 1,?0xA5,2048,
?{"NAND 2GiB 3,?0xD5,
?{"NAND 2GiB 1,?0xB5,?0xC5,

?/*
? * Renesas AND 1 Gigabit. Those chips do not support extended id and
? * have a strange page/block layout !? The chosen minimum erasesize is
? * 4 * 2 * 2048 = 16384 Byte,as those chips have an array of 4 page
? * planes 1 block = 2 pages,but due to plane arrangement the blocks
? * 0-3 consists of page 0 + 4,1 + 5,2 + 6,3 + 7 Anyway JFFS2 would
? * increase the eraseblock size so we chose a combined one which can be
? * erased in one go There are more speed improvements for reads and
? * writes possible,but not implemented now
? */
?{"AND 128MiB 3,?0x01,
? NAND_IS_AND | NAND_NO_AUTOINCR |NAND_NO_READRDY | NAND_4PAGE_ARRAY |
? BBT_AUTO_REFRESH
?},

?{NULL,}
};

每行的16进制数就是相应nandflash的ID号 确实没16,这里说明一下在uboot 2008.10版本有两个关于struct nand_flash_dev nand_flash_ids[] = {的定义

而如何知道?if (dev_id == nand_flash_ids[i].id)语句中的nand_flash_ids的定义就是drivers/mtd/nand/nand_ids.c文件里的呢,我们可以在

for (i = 0; nand_flash_ids[i].name != NULL; i++) {
??if (dev_id == nand_flash_ids[i].id) {

printf("%s",nand_flash_ids[i].name );//打印nand_flash_ids结构体name成员，
???type =? &nand_flash_ids[i];
???break;

另一个nand_flash_ids的定义为

?static struct nand_flash_dev nand_flash_ids[] = {
?{"Toshiba TC5816BDC",???? NAND_MFR_TOSHIBA,0x64,21,
?{"Toshiba TC5832DC",????? NAND_MFR_TOSHIBA,0x6b,22,
?{"Toshiba TH58V128DC",??? NAND_MFR_TOSHIBA,0x73,24,
?{"Toshiba TC58256FT/DC",? NAND_MFR_TOSHIBA,0x75,25,
?{"Toshiba TH58512FT",0x76,26,3,
?{"Toshiba TC58V32DC",0xe5,
?{"Toshiba TC58V64AFT/DC",NAND_MFR_TOSHIBA,0xe6,23,
?{"Toshiba TC58V16BDC",0xea,
?{"Toshiba TH58100FT",0x79,27,
?{"Samsung KM29N16000",??? NAND_MFR_SAMSUNG,
?{"Samsung unknown 4Mb",?? NAND_MFR_SAMSUNG,
?{"Samsung KM29U128T",???? NAND_MFR_SAMSUNG,
?{"Samsung KM29U256T",
?{"Samsung unknown 64Mb",? NAND_MFR_SAMSUNG,
?{"Samsung KM29W32000",0xe3,
?{"Samsung KM29U64000",
?{"Samsung KM29W16000",
?{"Samsung K9F5616Q0C",0x45,1},
?{"Samsung K9K1216Q0C",0x46,
?{"Samsung K9F1G08U0M",0xf1,
?{NULL,}
};

而打印结果为

NAND:? In drivers/mtd/nand/nand.c
dev_id = 16
NAND 16MiB 1,8V 8-bit
NAND 16MiB 3,3V 8-bit
NAND 16MiB 1,8V 16-bit
NAND 16MiB 3,3V 16-bit
NAND 32MiB 1,8V 8-bit
NAND 32MiB 3,3V 8-bit
NAND 32MiB 1,8V 16-bit
NAND 32MiB 3,3V 16-bit
NAND 64MiB 1,8V 8-bit
NAND 64MiB 3,3V 8-bit
NAND 64MiB 1,8V 16-bit
NAND 64MiB 3,3V 16-bit
NAND 128MiB 1,8V 8-bit
NAND 128MiB 1,8V 8-bit
NAND 128MiB 3,3V 8-bit
NAND 128MiB 1,8V 16-bit
NAND 128MiB 1,8V 16-bit
NAND 128MiB 3,3V 16-bit
NAND 128MiB 3,3V 16-bit
NAND 256MiB 3,3V 16-bit
NAND 256MiB 1,8V 8-bit
NAND 256MiB 3,3V 8-bit
NAND 256MiB 1,8V 16-bit
NAND 256MiB 3,3V 16-bit
NAND 512MiB 1,8V 8-bit
NAND 512MiB 3,3V 8-bit
NAND 512MiB 1,8V 16-bit
NAND 512MiB 3,3V 16-bit
NAND 1GiB 1,8V 8-bit
NAND 1GiB 3,3V 8-bit
NAND 1GiB 1,8V 16-bit
NAND 1GiB 3,3V 16-bit
NAND 2GiB 1,8V 8-bit
NAND 2GiB 3,3V 8-bit
NAND 2GiB 1,8V 16-bit
NAND 2GiB 3,3V 16-bit
AND 128MiB 3,3V 8-bit
No NAND device found!!!
0 MiB

可见nand_flash_ids的定义位置

针对16这ID号 我直接编译了tekkamanninja 的uboot 同样加上打印语句发现ID号为218，而同一块开发板ID号是不可能不通的。 可见是nandflash的初始化出问题了ID都读错了。好了找到问题出在哪就好解决了，还是那个文件开始提到的cpu/arm920t/s3c24X0/nand.c 文件，问题就出在他身上。重新修正，果然NFCONT 被我误写成了NFCONF 修改 编译

NAND: 256M

哈 成了！

现写下此文，已记录问题的解决过程。。。