> >>I did a "eraseall" of the device, but the moment I try to write, it's 
> >>all marked bad...
> >>Any new hints?
> > Make sure that bad block checking in the MTD layer is commented 
> out (it does wipe all the factory marked bad blocks but in my 
> experience this is not a crisis for development work) or the 
> blocks are not erased at all and remain "bad".
> 
> Well, the device does report 99% free according to "df" after eraseall.
> Further, a "mkyaffs" on the device does not state that there is 
> thousands of bad blocks - just the factory ones, so I think eraseall 
> does it correct?
> Moreover, I tried it on a new NAND device never before being used for 
> YAFFS, and the same occured (with my new kernel without YAFFS_ECC)...
> 
> You still think I should try without bad block checking?
No. It sounds like the mtd layer is content.

I am surprised that you are having this grief. You will probably need to add a liberal smattering of printks to tease ot the issue. Is it the mtd layer reporting write errors? Is it read/write oob reporting rubbish?
> 
> // Martin

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