uboot的nand flash常用命令

nand info & nand device

显示flash的信息：

DM365?:>nand info
Device 0: NAND 32MiB 3,3V 8-bit,sector size 16 KiB
DM365?:>nand device
Device 0: NAND 32MiB 3,3V 8-bit

nand read(.oob) addr off size

不管是读取data,使用nand read，还是读取oob，使用命令nand read.oob， 后面跟的地址addr，都是ram的地址， off指的是nand flash的地址， size：指要读取nand flash的数据大小， 但是如果是读取oob， size不能超过一个page的oob size， 如果page size为512个字节， oob size就是16个字节.

DM365?:>nand read 86000000 58000 100
NAND read: device 0 offset 0x58000,size 0x100
 256 bytes read: OK
DM365?:>md 86000000 40
86000000: ea000012 e59ff014 e59ff014 e59ff014    ................ 
 …………
860000f0: e1a0000d eb00022e 00000000 00000000    ................

DM365?:>nand read.oob 86000000 58000 10
NAND read: device 0 offset 0x58000,size 0x10
 16 bytes read: OK
DM365?:>md 86000000 40                 
 86000000: ffffffff 2707ffff 33e316ad 44b2e1a1    .......'...3...D

如果一次想读取完整的一个page 的值，包含oob， 使用下面将的命令， nand dump.

nand dump [addr] [size]

调用过程： nand dump addr size (common/cmd_nand.c)==> nand_dump() ==> nand_read_raw();
nand dump 不管你的size有多大，至少会dump出一个page的大小：

SMDK2440 # nand dump 0 100
Page 00000000 dump:
   12 00 00 ea 14 f0 9f e5  14 f0 9f e5 14 f0 9f e5 
   14 f0 9f e5 14 f0 9f e5  14 f0 9f e5 14 f0 9f e5
   00 02 f8 33 60 02 f8 33  c0 02 f8 33 20 03 f8 33
   80 03 f8 33 e0 03 f8 33  40 04 f8 33 ef be ad de
   00 00 f8 33 00 00 f8 33  58 19 fa 33 34 6d fa 33
   00 00 0f e1 1f 00 c0 e3  d3 00 80 e3 00 f0 29 e1
   …………
   04 30 8c e5 fc 4d 00 eb  00 01 9f e5 f0 3c 00 eb
   02 0d 00 eb 41 42 00 eb  f4 00 9f e5 00 40 98 e5
   04 02 00 eb 0d 10 a0 e1  04 00 84 e5 40 20 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
   69 a6 ab 3c 33 cf 66 5a
   a7 cf f0 33 a6 96 97 3f
   0c c3 30 30 c3 cc 33 f3

nand write - addr off size

这个命令和nand read一样， 只是方向是反的， 是把ram的值写到 nand flash中， 但是这个写只能将1改为0， 不能将0写成1. 这个command会自动skipping bad blocks。

nand erase [clean] [off size]

在擦之前会先check是不是坏块，如果是坏块，就不能做擦的动作了。

DM365?:>nand dump 1cc000 10
Page 001cc000 dump:
       68 73 71 73 12 05 00 00  87 04 08 78 19 00 40 02
       …………
       df 88 5b 80 bb 11 32 11  6e e7 77 5a 3d b9 c8 bf
OOB:
       ff ff ff ff ff ff ff 45
       ed cc 3a e0 8e 52 f9 ad

DM365?:>nand erase 1cc000 100
NAND erase: device 0 offset 0x1cc000,size 0x100
Warning: Erase size 0x00000100 smaller than one erase block 0x00004000
         Erasing 0x00004000 instead
Erasing at 0x1cc000 -- 100% complete.
OK

DM365?:>nand dump 1cc000 10  
Page 001cc000 dump:
       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
OOB:
       ff ff ff ff ff ff ff ff
       ff ff ff ff ff ff ff ff

DM365?:>mw 86000000 00000000
DM365?:>mw 86000004 00000000
DM365?:>mw 86000008 00000000
DM365?:>mw 8600000c 00000000
DM365?:>md 86000000         
 86000000: 00000000 00000000 00000000 00000000    ................

DM365?:>nand write.oob 86000000 1cc000 10
NAND write: device 0 offset 0x1cc000,size 0x10
 16 bytes written: OK

DM365?:>nand dump 1cc000 10 
Page 001cc000 dump:
       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
OOB:
       00 00 00 00 00 00 00 00
       00 00 00 00 00 00 00 00

DM365?:>nand erase 1cc000 100
NAND erase: device 0 offset 0x1cc000,size 0x100
Warning: Erase size 0x00000100 smaller than one erase block 0x00004000
         Erasing 0x00004000 instead
Skipping bad block at  0x001cc000                                            
OK

不常用的命令

这些命令都是测试时使用的，正常是不会使用到的。

 "nand scrub - really clean NAND erasing bad blocks (UNSAFE)n"
 "nand markbad off - mark bad block at offset (UNSAFE)n"
 "nand biterr off - make a bit error at offset (UNSAFE)n"
 "nand lock [tight] [status]n"
 "    bring nand to lock state or display locked pagesn"
 "nand unlock [offset] [size] - unlock sectionn");