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五、Nand Flash操作指令
常用的Nand Flash指令如下：指令 | 功能 | | nand info | 显示可使用的Nand Flash | | nand device [dev] | 显示或设定当前使用的Nand Flash | nand read
addr off
size | Nand Flash读取命令，从Nand的 off 偏移地址处读取size 字节的数据到SDRAM的 addr地址。 | nand write
addr off
size | Nand Flash烧写命令，将SDRAM的 addr地址处的size 字节的数据烧写到Nand的 off 偏移地址。 | nand write[.yaffs[1]]
addr off size | 烧写yaffs 映像专用的命令，.yaffs1 for 512+16 NAND | | nand erase [clean] [off size] | Nand Flash檫除命令，擦除Nand Flash的 off 偏移地址处的size 字节的数据 | | nand bad | 显示Nand Flash的坏块 | | nand dump[.oob] off | 显示Nand Flash中的数据（16进制） | | nand scrub | 彻底擦除整块Nand Flash中的数据，包括OOB。可以擦除软件坏块标志。 | | nand markbad off | 标示 Nand的 off 偏移地址处的块为坏块 |
使用范例： [u-boot@MINI2440]# nand info
Device 0: NAND 128MiB 3,3V 8-bit, sector size 128 KiB
[u-boot@MINI2440]# nand device 0
Device 0: NAND 128MiB 3,3V 8-bit... is now current device
[u-boot@MINI2440]# nand read 0x30008000 0x60000 200000
NAND read: device 0 offset 0x60000, size 0x200000
2097152 bytes read: OK
[u-boot@MINI2440]# nand bad
Device 0 bad blocks:
030a0000
030c0000
030e0000
07ee0000
[u-boot@MINI2440]# nand markbad 0x500000
block 0x00500000 successfully marked as bad
[u-boot@MINI2440]# nand bad
Device 0 bad blocks:
00500000
030a0000
030c0000
030e0000
07ee0000
[u-boot@MINI2440]# nand scrub
NAND scrub: device 0 whole chip
Warning: scrub option will erase all factory set bad
There is no reliable way to recover them.
Use this command only for testing purposes if you
are sure of what you are
Really scrub this NAND flash? <y/N>
Erasing at 0x2f4000008000000 -- 0% complete.
NAND 128MiB 3,3V 8-bit: MTD Erase failure: -5
NAND 128MiB 3,3V 8-bit: MTD Erase failure: -5
NAND 128MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0x7ea000008000000 -- 0% complete.
NAND 128MiB 3,3V 8-bit: MTD Erase failure: -5
Erasing at 0x7fe000008000000 -- 0% complete.
OK
[u-boot@MINI2440]# nand bad
Device 0 bad blocks:
030a0000
030c0000
030e0000
07ee0000
[u-boot@MINI2440]# nand dump 0x8000
Page 00008000 dump:
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
(略)
OOB:
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
[u-boot@MINI2440]# tftp u-boot.bin
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:08:11:18:12:27
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.100; our IP address is 192.168.1.101
Filename 'u-boot.bin'.
Load address: 0x30008000
Loading: T ##################
done
Bytes transferred = 256220 (3e8dc hex)
[u-boot@MINI2440]# nand write 0x30008000 0 40000
NAND write: device 0 offset 0x0, size 0x40000
Writing at 0x2000000020000 -- 100% is complete. 262144 bytes written: OK
[u-boot@MINI2440]# nand dump 0x8000
Page 00008000 dump:
00 00 53 e1 01 00 00 2a 15 40 e0 e3 19 00 00 ea
(略)
60 30 97 e5 03 00 54 e1 f6 ff ff ba 00 40 a0 e3
OOB:
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
65 a9 6b f3 ff 33 fc 30
f3 33 cf 33 0f f0 ff 00
cc 0f 59 55 57 96 a5 5b
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nboot 指令也是一条Nand Flash 读取指令，它是将Nand Flash 的 offset 偏移地址的内核映像读取到SDRAM的loadAddr位置。它会自动读取到内核映像（使用mkimage处理过的）的结束，所以不用给出读取大小。格式：nboot loadAddr dev offset使用范例：[u-boot@MINI2440]# tftp 192.168.1.100:zImage.img
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:08:11:18:12:27
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.100; our IP address is 192.168.1.101
Filename 'zImage.img'.
Load address: 0x30008000
Loading: T #################################################################
#################################################################
##########################
done
Bytes transferred = 2277540 (22c0a4 hex)
[u-boot@MINI2440]# nand erase 0x100000 300000
NAND erase: device 0 offset 0x100000, size 0x300000
Erasing at 0x3e000001800000 -- 0% complete.
OK
[u-boot@MINI2440]# nand write 0x30008000 0x100000 300000
NAND write: device 0 offset 0x100000, size 0x300000
Writing at 0x3e000000020000 -- 100% is complete. 3145728 bytes written: OK
[u-boot@MINI2440]# nand device 0
Device 0: NAND 128MiB 3,3V 8-bit... is now current device
[u-boot@MINI2440]# nboot 30008000 0 0x100000
Loading from NAND 128MiB 3,3V 8-bit, offset 0x100000
Image Name: tekkaman
Created: 2010-03-29 12:59:51 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2277476 Bytes = 2.2 MB
Load Address: 30008000
Entry Point: 30008040
[u-boot@MINI2440]# bootm 30008000
## Booting kernel from Legacy Image at 30008000 ...
Image Name: tekkaman
Created: 2010-03-29 12:59:51 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2277476 Bytes = 2.2 MB
Load Address: 30008000
Entry Point: 30008040
Verifying Checksum ... OK
XIP Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.33.1 (tekkaman@MAGI-Linux) (gcc version 4.3.2(crosstool-NG-1.6.1-tekkaman) ) #5 Mon Mar 29 20:58:50 CST 2010
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: MINI2440
（略） |
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