Hello,
> I have encountered this problem too. Eddie, could you post or send me
> your solution?
You can download a modified eraseall utility, and modified kernel
source code that will allow you to erase blocks marked as bad
here ftp://oz.embeddedarm.com/tmp/erase_BB/. I haven't tested the
modified kernel source code, let me know if you see any problems.
//Eddie
> --- In "Eddie Dawydiuk" <> wrote:
>>
>> Hi Phil,
>>
>>> Now I am just interested in the amount of "bad blocks" that I have.
>>> There are 223 bad blocks which equates to ~3.5MB unusable. Is this
>>> an expected number given that my board is 9 months old, and I
>>> wouldn't have thought my usage of the onboard flash was particularly
>>> severe. My application basically writes data to the flash, and then
>>> periodically when the flash is near filling up, I transfer it out
>>> and delete the data. I have probably gone through no more the 3
>>> cycles of filling it up with data, transferring the data, deleting
>>> the data.
>>>
>>> Also, is it correct that any "bad blocks" are flagged when erasing
>>> the flash and throw error messages like ...
>>>
>>> "eraseall: /dev/mtd/1: MTD Erase failure: Input/output error"
>>>
>>> or is this indicating a different problem. (I get 223 of the above
>>> messages, one for each bad block). Is it possible that these blocks
>>> have just been incorrectly flagged as bad, when I had the problem
>>> that I originally posted about?
>>
>> I believe they may have been incorrectly marked bad, this is what
>> I was refering to in the last email. That is I have seen when a
>> large number of files(tens of thousands of files) are created on
>> Yaffs1, when you try to recursively delete the files some of the
>> files will not delete reporting the directory is not empty. Yaffs
>> will try several times to delete the file and end up marking the
>> block as bad. This is the problem I have mentioned to Charles
>> Manning about Yaffs1. The more information you could provide him
>> the better...
>>
>> Typically 1-2% of bad blocks marked bad is normal. You have
>> 223 / 8000 => 2.78 % this is somewhat high.
>>
>>> And if so would the programs you mentioned in your reply help here?
>>> If so, where would I be able to obtain these programs?
>>
>> The eraseall utility as well as the mtd device drivers will refuse
>> to delete any blocks marked bad. I have hacked the mtd drivers as
>> well as the mtd device driver so you can delete blocks marked bad.
>> I'll email the kernel and eraseall utility if you'd like...
>>
>> //Eddie
>>
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