AM3352 nand flash 可以检测到可以擦除，但是读写有问题

nand读部分块的时候可以成功，但是写一直出现问题。在写错误之后再读也会报错。nand硬件没有写保护。

NAND read: device 0 offset 0x6c0000, size 0x10000
 65536 bytes read: OK
MYIR># nand read 82000000 6c0000 10000

NAND read: device 0 offset 0x6c0000, size 0x10000
 65536 bytes read: OK
MYIR># nand write 82000000 6c0000 10000

NAND write: device 0 offset 0x6c0000, size 0x10000
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
NAND write to offset 6c0000 failed -5
 0 bytes written: ERROR
MYIR># nand read 82000000 6c0000 10000

NAND read: device 0 offset 0x6c0000, size 0x10000
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
NAND read from offset 6c0000 failed -74
 0 bytes read: ERROR
MYIR># nand erase.chip

NAND erase.chip: device 0 whole chip
Erasing at 0x3ff80000 — 100% complete.
OK
MYIR># nand read 82000000 6c0000 10000

NAND read: device 0 offset 0x6c0000, size 0x10000
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
omap-elm: uncorrectable ECC errors
NAND read from offset 6c0000 failed -74
 0 bytes read: ERROR

Nancy Wang：

参考这个帖子看一下。
e2e.ti.com/…/543748

user6102948：

回复 Nancy Wang:

我们之前用的就是BCH8,不行,后来我看flash是4096的，我换了BCH16还是不行