uboot Nand flash 命令詳解

顯示flash的資訊：

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

不管是讀取data, 使用nand read，還是讀取oob，使用命令nand read.oob，後面跟的位址addr，都是ram的位址，off指的是nand flash的位址， size：指要讀取nand flash的資料大小，但是如果是讀取oob，size不能超過乙個page的oob size，如果page size為512個位元組， oob size就是16個位元組.

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

如果一次想讀取完整的乙個page 的值，包含oob，使用下面將的命令， nand dump.

呼叫過程：nand dump addr size (common/cmd_nand.c)==> nand_dump() ==> nand_read_raw();

nand dump 不管你的size有多大，至少會dump出乙個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

這個命令和nand read一樣，只是方向是反的，是把ram的值寫到 nand flash中，但是這個寫只能將1改為0，不能將0寫成1. 這個command會自動skipping bad blocks。

在擦之前會先check是不是壞塊，如果是壞塊，就不能做擦的動作了。

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

ok

這些命令都是測試時使用的，正常是不會使用到的。

"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 pages\n"
"nand unlock [offset] [size] - unlock section\n");

uboot中記憶體操作:

uboot Nand flash 命令詳解

U Boot NAND FLASH驅動分析

U Boot NAND FLASH驅動分析

u boot nand flash驅動架構分析一

uboot Nand flash 命令詳解

U Boot NAND FLASH驅動分析

U Boot NAND FLASH驅動分析

u boot nand flash驅動架構分析一

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