[ts-7000] bad eraseblocks

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Hi

 

I have a TS7250 and want to ask advice on bad eraseblocks. I have 128MB NAND flash on my TS7250 (which runs 24/7) and did not have any bad eraseblocks. Suddenly a few days ago the board seemed to have crashed. Upon further investigation I discovered that it report approx. 2300 bad eraseblocks (approx. 32MB) when I reboot it. All of these bad eraseblocks (except 1) is between 0x04000000 and 0x07d00000, which is the last approx. 61MB of the Linux MTD partition (/dev/mtd1). I would like to know the following:

1.   Can the YAFFS file system have anything to do with these bad eraseblocks?

2.   Can the Bad Block Table (BBT) of the flash become corrupted, or is it re-generated every time the device is booted?

3.    Is there a utility to check/erase the entire /dev/mtdblock1 in an attempt to recover these bad eraseblocks?

 

Any suggestions will be appreciated.

 

Regards

Wouter  

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