u-boot nand flash read/write cmd

  支援的命令函數說明

1. nand info/nand device

功能：顯示當前nand flash晶片資訊。

函數調用關係如下(按先後順序)：

static void nand_print(struct nand_chip *nand) ;

2. nand erase

功能：擦除指定塊上的數據。

函數調用關係如下(按先後順序)：

int nand_erase(struct nand_chip* nand, size_t ofs, size_t len, int clean);

3. nand bad

功能：顯示壞塊。

函數調用關係如下(按先後順序)：

static void nand_print_bad(struct nand_chip* nand);

int check_block (struct nand_chip *nand, unsigned long pos);

4. nand read

功能：讀取nand flash資訊到SDRAM。

函數調用關係如下(按先後順序)：

int nand_rw (struct nand_chip* nand, int cmd,size_t start, size_t len, size_t * retlen, u_char * buf);

static int nand_read_ecc(struct nand_chip *nand, size_t start, size_t len,

size_t * retlen, u_char *buf, u_char *ecc_code);

static void NanD_ReadBuf (struct nand_chip *nand, u_char * data_buf, int cntr);

READ_NAND(adr);

5. nand write

功能：從SDRAM寫數據到nand flash中。

函數調用關係如下(按先後順序)：

int nand_rw (struct nand_chip* nand, int cmd,size_t start, size_t len, size_t * retlen, u_char * buf);

static int nand_write_ecc (struct nand_chip* nand, size_t to, size_t len,

size_t * retlen, const u_char * buf, u_char * ecc_code);

static int nand_write_page (struct nand_chip *nand, int page, int col, int last, u_char * ecc_code);

WRITE_NAND(d , adr);

4.2.32 nand info

列印nand flash資訊

CRANE2410 # nand info

Device 0: Samsung K9F1208U0B at 0x4e000000 (64 MB, 16 kB sector)

4.2.33 nand device <n>

顯示某個nand設備

CRANE2410 # nand device 0

Device 0: Samsung K9F1208U0B at 0x4e000000 (64 MB, 16 kB sector)

... is now current device

4.2.34 nand bad

CRANE2410 # nand bad

Device 0 bad blocks:

4.2.35 nand read

nand read InAddr FlAddr size

InAddr: 從nand flash中讀到記憶體的起始位址。

FlAddr: nand flash 的起始位址。

size: 從nand flash中讀取的數據的大小。

CRANE2410 # nand read 0x30008000 0 0x100000

NAND read: device 0 offset 0, size 1048576 ...

1048576 bytes read: OK

4.2.36 nand erease

nand erase FlAddr size

FlAddr: nand flash 的起始位址

size: 從nand flash中擦除資料塊的大小

CRANE2410 # nand erase 0x100000 0x20000

NAND erase: device 0 offset 1048576, size 131072 ... OK

4.2.37 nand write

nand write InAddr FlAddr size

InAddr: 寫到Nand Flash中的資料在記憶體的起始位址

FlAddr: Nand Flash的起始位址

size: 數據的大小

CRANE2410 # nand write 0x30f00000 0x100000 0x20000

NAND write: device 0 offset 1048576, size 131072 ...

131072 bytes written: OK

4.2.37 nboot

u-boot-1.1.4代碼對於nboot命令的幫助不正確，修改如下:

正確的順序為：

nboot InAddr dev FlAddr

InAddr: 需要裝載到的記憶體的位址。

FlAddr: 在nand flash上uImage存放的位址

dev: 設備號

需要提前設置環境變數，否則nboot不會調用bootm

CRANE2410 #setenv autostart yes

CRANE2410 # nboot 30008000 0 100000

Loading from device 0: <NULL> at 0x4e000000 (offset 0x100000)

Image Name: Linux-2.6.14.3

Created: 2006-07-06 7:31:52 UTC

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 897428 Bytes = 876.4 kB

Load Address: 30008000

Entry Point: 30008040

Automatic boot of image at addr 0x30008000 ...

## Booting image at 30008000 ...

Starting kernel ...

4.3 命令簡寫說明

是以命令都可以簡寫，隻要命令前面的一部分不會跟其他命令相同,就可以不用寫全整個命令.

save命令

CRANE2410 # sa

Saving Environment to Flash...

Un-Protected 1 sectors

Erasing Flash...Erasing sector 10 ... Erased 1 sectors

4.4 把檔案寫入NandFlash

如果把一個傳到記憶體中的檔寫入到Nand Flash中, 如：新的uboot.bin, zImage(內核),

rootfs等, 如果做呢？我們可以用Nand Flash命令來完成. 但是Nand Flash寫時,必須先要把Nand

Flash的寫入區全部擦除後,才能寫. 下面以把記憶體0x30008000起長度為0x20000的內容寫到Nand

Flash中的0x100000為例.

CRANE2410 # nand erase 0x100000 0x20000

NAND erase: device 0 offset 1048576, size 131072 ... OK

CRANE2410 # nand write 0x30008000 0x100000 0x20000

NAND write: device 0 offset 1048576, size 131072 ...

131072 bytes written: OK

  我的nand flash 32M，kernel 2.6.18, rootfs emb linux, cramfs.

nand flash分區如下：

static struct mtd_partition nand_partitions[] = {

  {

  .name = "bootloader",

  .offset = 0,

  .size = 32 * NAND_BLOCK_SIZE, //32x16 = 512k

  .mask_flags = MTD_WRITEABLE,

  },

  {

  .name = "params",

  .offset = MTDPART_OFS_APPEND,

  .size = 96 * NAND_BLOCK_SIZE, //96x16 = 1536k = 1.5M

  .mask_flags = MTD_WRITEABLE,

  },

  {

  .name = "kernel",

  .offset = MTDPART_OFS_APPEND,

  .size = SZ_2M, //2M

  .mask_flags = 0

  },

  {

  .name = "filesystem1",

  .offset = MTDPART_OFS_APPEND,

  .size = SZ_16M + SZ_8M, //24M

  .mask_flags = 0

  },

  {

  .name = "filesystem2",

  .offset = MTDPART_OFS_APPEND,

  .size = MTDPART_SIZ_FULL, //4M, /mnt/nand, save log,sysenv,

  .mask_flags = 0

  }

};

//系統啟動後

# cat /proc/partitions  

major minor #blocks name  

  31 0 512 mtdblock0  

  31 1 1536 mtdblock1  

  31 2 2048 mtdblock2  

  31 3 24576 mtdblock3  

  31 4 4096 mtdblock4  

254 0 512 sbulla  

#

# cat /proc/mtd  

dev: size erasesize name  

mtd0: 00080000 00004000 "bootloader"  

mtd1: 00180000 00004000 "params"  

mtd2: 00200000 00004000 "kernel"  

mtd3: 01800000 00004000 "filesystem1"  

mtd4: 00400000 00004000 "filesystem2"  

#

我的問題是, 以下指令是廠家提供的，是可以執行成功的指令，我不了解其中到某些指令：

在U-boot燒寫時，用以下指令：

tftpboot 0x80700000 uImage_ipnc_dm365 //可以了解

tftpboot 0x82000000 cramfsImage_ipnc_dm365.v1.2.4-debug-param //可以了解

nand erase 0x200000 0xDF0000 //不了解，本句的意思是把kernel分區和rootfs分區擦除，0xDF0000 = 13.9375M, 而核心和檔案系統共2M+24M=26M，為什麼不是#nand erase 0x200000 0x1A00000 (26M).

nand write 0x80700000 0x200000 0x200000 //可以了解，寫核心到NAND FLASH, 從記憶體位址 0x80700000 讀取大小為 0x200000(2M)的資料，寫入nand flash，寫入的起始位址為0x200000。

nand write 0x82000000 0x400000 0xBF0000 //不了解，寫檔案系統到NAND FLASH, 意思是從記憶體位址 0x82000000 讀取大小為 0xBF0000(11.9375M)的資料，寫入nand flash，寫入的起始位址為0x400000。為什麼隻寫0xBF0000(11.9375M)的資料，我的檔案系統分區24M啊，實際的檔案系統也 22M左右，why？

請各路高手看看。

，比如我在U-boot燒寫檔案系統時，我隻想對檔案系統filesystem1分區擦除然後更新檔案系統，不擦核心和最後的分區（filesystem2），該怎麼用nand erase指令，偏移多少，大小多少。如何精确的調整,我覺得這個值必須很精确，不然會影響到前一個分區和最後的分區的資料。

 啟動NFS

/usr/sbin/exportfs -a

/sbin/service nfs restart

開啟tftp服務

/sbin/chkconfig tftp on

啟動NFS服務

/etc/init.d/portmap start

/etc/init.d/nfs start

停止NFS服務

/etc/init.d/nfs stop

/etc/init.d/portmap stop

重新啟動NFS服務

/etc/init.d/nn/se

--------------------------------------------------------------------------------------

/etc/init.d/ssh restart

mount -t vfat /dev/sda1 /mnt

fdisk －l

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DVS6446環境變量設定

NFS booot

setenv bootargs mem=60M console=ttyS0,115200n8 root=/dev/nfs noinitrd rw ip=192.168.253.130:255.255.255.0:192.168.253.1 nfsroot=192.168.253.229:/opt/nfs video=dm64xxfb:output=pal

NAND boot

setenv bootargs mem=60M console=ttyS0,115200n8 init=/linuxrc root=/dev/mtdblock0 rw noinitrd rootfstype=yaffs ip=192.168.253.140:255.255.255.0:192.168.253.1 video=dm64xxfb:output=pal

硬碟boot

setenv bootargs mem=60M console=ttyS0,115200n8 root=/dev/hda1 noinitrd rw ip=192.168.253.183:255.255.255.0:192.168.253.1 video=dm64xxfb:output=pal

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DVS6467

setenv bootargs mem=80M console=ttyS0,115200n8 root=/dev/mtdblock3 rootfstype=jffs2 noinitrd rw ip=192.168.253.183:192.168.253.1:255.255.255.0 video=dm64xxfb:output=pal

vlc rtsp://192.168.253.130/TSStream-1 --clock-synchro=0

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IPC365闆卡網絡檔案系統；

setenv bootargs console=ttyS0,115200n8 noinitrd rw ip=192.168.253.130 root=/dev/nfs nfsroot=192.168.253.229:/opt/nfs, nolock mem=80M video=davincifb dm365_imp.oper_mode=0 davinci_capture.device_type=4

IPC365 FLASH檔案系統

setenv bootargs mem=80M console=ttyS0,115200n8 noinitrd rw ip=192.168.253.130:192.168.253.1:255.255.255.0 root=/dev/mtdblock3 rootfstype=yaffs video=davincifb:osd0=720x576x16,4050K dm365_imp.oper_mode=0 davinci_capture.device_type=4

IPC365闆卡的環境變量設定

bootdelay=4

baudrate=115200

bootargs=console=ttyS0,115200n8 noinitrd rw ip=192.168.253.130 root=/dev/nfs nfsroot=192.168.253.229:/opt/nfs, nolock mem=80M video=davincifb dm365_imp.oper_mode=0 davinci_capture.device_type=4

stdin=serial

stdout=serial

stderr=serial

ver=U-Boot 1.3.4 (Dec 7 2009 - 11:07:06)

bootfile="uImage-dm365"

bootcmd=tftp 0x80700000 uImage-dm365;bootm

serverip=192.168.253.229

ipaddr=192.168.253.120

autostart=yes

ethaddr=11:22:23:24:15:19

setenv bootcmd 'tftp 0x80700000 uImage-dm365;bootm'

setenv bootcmd 'tftp 0x80700000 uImage-dm365;bootm'

setenv ethaddr 11:22:23:24:15:19

setenv autostart

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DM365 開發闆 環境變量

bootdelay=4

baudrate=115200

bootfile="uImage"

ipadd=192.168.1.3

server=192.168.1.2

filesize=1FC08C

fileaddr=80800000

autostart=yes

bootcmd=nboot 0x80800000 0 0x200000

serverip=192.168.15.110

ethaddr=00:11:11:11:11:11

setenv bootargs mem=80M console=ttyS0,115200n8 noinitrd rw ip=192.168.253.186:255.255.255.0:192.168.253.1 root=/dev/mtdblock3 rootfstype=yaffs video=davincifb:osd0=720x576x16,4050K dm365_imp.oper_mode=0 davinci_capture.device_type=4

ipaddr=192.168.15.3

stdin=serialip

stdout=serial

stderr=serial

ver=U-Boot 1.3.4 (Dec 7 2009 - 11:07:06)

Environment size: 544/262140 bytes

setenv bootargs mem=80M console=ttyS0,115200n8 root=/dev/nfs noinitrd rw ip=192.168.253.144:255.255.255.0:192.168.253.1 nfsroot=192.168.253.229:/opt/nfs video=davincifb:osd0=720x576x16,4050K dm365_imp.oper_mode=0 davinci_capture.device_type=4

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SEED-DEC138闆卡環境變量修改：

網絡檔案系統啟動

setenv bootargs mem=128M console=tty0 root=/dev/nfs nfsroot=192.168.253.229:/opt/nfs rw ip=192.168.253.145:192.168.253.1:255.255.255.0

setenv bootcmd 'tftp 0xc80800000 uImage; bootm'

0x80700000

setenv bootcmd 'tftp 0xc0700000 uImage_dec138; bootm'

FLASH檔案系統啟動

SEED-OMAP3530

DNS設定

vi etc/resolv.conf

nameserver 202.113.196.115

nameserver 202.113.0.20