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, busw, &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 = %d\n",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, 256, 2, 0x1000, 0},
 {"NAND 4MiB 5V 8-bit",  0x6b, 512, 4, 0x2000, 0},
 {"NAND 1MiB 3,3V 8-bit", 0xe8, 256, 1, 0x1000, 0},
 {"NAND 1MiB 3,3V 8-bit", 0xec, 256, 1, 0x1000, 0},
 {"NAND 2MiB 3,3V 8-bit", 0xea, 256, 2, 0x1000, 0},
 {"NAND 4MiB 3,3V 8-bit",  0xd5, 512, 4, 0x2000, 0},
 {"NAND 4MiB 3,3V 8-bit", 0xe3, 512, 4, 0x2000, 0},
 {"NAND 4MiB 3,3V 8-bit", 0xe5, 512, 4, 0x2000, 0},
 {"NAND 8MiB 3,3V 8-bit", 0xd6, 512, 8, 0x2000, 0},

 {"NAND 8MiB 1,8V 8-bit", 0x39, 512, 8, 0x2000, 0},
 {"NAND 8MiB 3,3V 8-bit", 0xe6, 512, 8, 0x2000, 0},
 {"NAND 8MiB 1,8V 16-bit", 0x49, 512, 8, 0x2000, NAND_BUSWIDTH_16},
 {"NAND 8MiB 3,3V 16-bit", 0x59, 512, 8, 0x2000, NAND_BUSWIDTH_16},
#endif

 {"NAND 16MiB 1,8V 8-bit", 0x33, 512, 16, 0x4000, 0},
 {"NAND 16MiB 3,3V 8-bit", 0x73, 512, 16, 0x4000, 0},
 {"NAND 16MiB 1,8V 16-bit", 0x43, 512, 16, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 16MiB 3,3V 16-bit", 0x53, 512, 16, 0x4000, NAND_BUSWIDTH_16},

 {"NAND 32MiB 1,8V 8-bit", 0x35, 512, 32, 0x4000, 0},
 {"NAND 32MiB 3,3V 8-bit", 0x75, 512, 32, 0x4000, 0},
 {"NAND 32MiB 1,8V 16-bit", 0x45, 512, 32, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 32MiB 3,3V 16-bit", 0x55, 512, 32, 0x4000, NAND_BUSWIDTH_16},

 {"NAND 64MiB 1,8V 8-bit", 0x36, 512, 64, 0x4000, 0},
 {"NAND 64MiB 3,3V 8-bit", 0x76, 512, 64, 0x4000, 0},
 {"NAND 64MiB 1,8V 16-bit", 0x46, 512, 64, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 64MiB 3,3V 16-bit", 0x56, 512, 64, 0x4000, NAND_BUSWIDTH_16},

 {"NAND 128MiB 1,8V 8-bit", 0x78, 512, 128, 0x4000, 0},
 {"NAND 128MiB 1,8V 8-bit", 0x39, 512, 128, 0x4000, 0},
 {"NAND 128MiB 3,3V 8-bit", 0x79, 512, 128, 0x4000, 0},
 {"NAND 128MiB 1,8V 16-bit", 0x72, 512, 128, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 128MiB 1,8V 16-bit", 0x49, 512, 128, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 128MiB 3,3V 16-bit", 0x74, 512, 128, 0x4000, NAND_BUSWIDTH_16},
 {"NAND 128MiB 3,3V 16-bit", 0x59, 512, 128, 0x4000, NAND_BUSWIDTH_16},

 {"NAND 256MiB 3,3V 8-bit", 0x71, 512, 256, 0x4000, 0},

 /*
  * 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 1,8V 8-bit", 0xA2, 0,  64, 0, LP_OPTIONS},
 {"NAND 64MiB 3,3V 8-bit", 0xF2, 0,  64, 0, LP_OPTIONS},
 {"NAND 64MiB 1,8V 16-bit", 0xB2, 0,  64, 0, LP_OPTIONS16},
 {"NAND 64MiB 3,3V 16-bit", 0xC2, 0,  64, 0, LP_OPTIONS16},

 /* 1 Gigabit */
 {"NAND 128MiB 1,8V 8-bit", 0xA1, 0, 128, 0, LP_OPTIONS},
 {"NAND 128MiB 3,3V 8-bit", 0xF1, 0, 128, 0, LP_OPTIONS},
 {"NAND 128MiB 1,8V 16-bit", 0xB1, 0, 128, 0, LP_OPTIONS16},
 {"NAND 128MiB 3,3V 16-bit", 0xC1, 0, 128, 0, LP_OPTIONS16},

 /* 2 Gigabit */
 {"NAND 256MiB 1,8V 8-bit", 0xAA, 0, 256, 0, LP_OPTIONS},
 {"NAND 256MiB 3,3V 8-bit", 0xDA, 0, 256, 0, LP_OPTIONS},
 {"NAND 256MiB 1,8V 16-bit", 0xBA, 0, 256, 0, LP_OPTIONS16},
 {"NAND 256MiB 3,3V 16-bit", 0xCA, 0, 256, 0, LP_OPTIONS16},

 /* 4 Gigabit */
 {"NAND 512MiB 1,8V 8-bit", 0xAC, 0, 512, 0, LP_OPTIONS},
 {"NAND 512MiB 3,3V 8-bit", 0xDC, 0, 512, 0, LP_OPTIONS},
 {"NAND 512MiB 1,8V 16-bit", 0xBC, 0, 512, 0, LP_OPTIONS16},
 {"NAND 512MiB 3,3V 16-bit", 0xCC, 0, 512, 0, LP_OPTIONS16},

 /* 8 Gigabit */
 {"NAND 1GiB 1,8V 8-bit", 0xA3, 0, 1024, 0, LP_OPTIONS},
 {"NAND 1GiB 3,3V 8-bit", 0xD3, 0, 1024, 0, LP_OPTIONS},
 {"NAND 1GiB 1,8V 16-bit", 0xB3, 0, 1024, 0, LP_OPTIONS16},
 {"NAND 1GiB 3,3V 16-bit", 0xC3, 0, 1024, 0, LP_OPTIONS16},

 /* 16 Gigabit */
 {"NAND 2GiB 1,8V 8-bit", 0xA5, 0, 2048, 0, LP_OPTIONS},
 {"NAND 2GiB 3,3V 8-bit", 0xD5, 0, 2048, 0, LP_OPTIONS},
 {"NAND 2GiB 1,8V 16-bit", 0xB5, 0, 2048, 0, LP_OPTIONS16},
 {"NAND 2GiB 3,3V 16-bit", 0xC5, 0, 2048, 0, LP_OPTIONS16},

 /*
  * 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 3,3V 8-bit", 0x01, 2048, 128, 0x4000,
  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, 1, 2, 0x1000, 0},
 {"Toshiba TC5832DC",      NAND_MFR_TOSHIBA, 0x6b, 22, 0, 2, 0x2000, 0},
 {"Toshiba TH58V128DC",    NAND_MFR_TOSHIBA, 0x73, 24, 0, 2, 0x4000, 0},
 {"Toshiba TC58256FT/DC",  NAND_MFR_TOSHIBA, 0x75, 25, 0, 2, 0x4000, 0},
 {"Toshiba TH58512FT",     NAND_MFR_TOSHIBA, 0x76, 26, 0, 3, 0x4000, 0},
 {"Toshiba TC58V32DC",     NAND_MFR_TOSHIBA, 0xe5, 22, 0, 2, 0x2000, 0},
 {"Toshiba TC58V64AFT/DC", NAND_MFR_TOSHIBA, 0xe6, 23, 0, 2, 0x2000, 0},
 {"Toshiba TC58V16BDC",    NAND_MFR_TOSHIBA, 0xea, 21, 1, 2, 0x1000, 0},
 {"Toshiba TH58100FT",     NAND_MFR_TOSHIBA, 0x79, 27, 0, 3, 0x4000, 0},
 {"Samsung KM29N16000",    NAND_MFR_SAMSUNG, 0x64, 21, 1, 2, 0x1000, 0},
 {"Samsung unknown 4Mb",   NAND_MFR_SAMSUNG, 0x6b, 22, 0, 2, 0x2000, 0},
 {"Samsung KM29U128T",     NAND_MFR_SAMSUNG, 0x73, 24, 0, 2, 0x4000, 0},
 {"Samsung KM29U256T",     NAND_MFR_SAMSUNG, 0x75, 25, 0, 2, 0x4000, 0},
 {"Samsung unknown 64Mb",  NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
 {"Samsung KM29W32000",    NAND_MFR_SAMSUNG, 0xe3, 22, 0, 2, 0x2000, 0},
 {"Samsung unknown 4Mb",   NAND_MFR_SAMSUNG, 0xe5, 22, 0, 2, 0x2000, 0},
 {"Samsung KM29U64000",    NAND_MFR_SAMSUNG, 0xe6, 23, 0, 2, 0x2000, 0},
 {"Samsung KM29W16000",    NAND_MFR_SAMSUNG, 0xea, 21, 1, 2, 0x1000, 0},
 {"Samsung K9F5616Q0C",    NAND_MFR_SAMSUNG, 0x45, 25, 0, 2, 0x4000, 1},
 {"Samsung K9K1216Q0C",    NAND_MFR_SAMSUNG, 0x46, 26, 0, 3, 0x4000, 1},
 {"Samsung K9F1G08U0M",    NAND_MFR_SAMSUNG, 0xf1, 27, 0, 2, 0, 0},
 {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 8-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 3,3V 8-bit
NAND 128MiB 1,8V 16-bit
NAND 128MiB 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。。。