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Date: Wed, 14 Jun 2006 13:02:44 +0300
From: Indrek Kruusa <indrek.kruusa@artecdesign.ee>
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Subject: Re: cat file > /dev/mtd0 works but after position 512
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Thomas Gleixner wrote:
> On Tue, 2006-06-13 at 17:02 +0300, Indrek Kruusa wrote:
>> Hi!
>>
>> I have Samsung 64 MB NAND behind cs553x flash controller - therefore 
>> cs553x_nand driver.
>> cat file > /dev/mtd0 works reportedly (with page aligned file). But 
>> after board reboots the flash is empty.
>>
>> dd ... bs=512 seek=1 of=/dev/mtd0  works and content stays in flash 
>> after reboot too (it works I mean :) )
>>
>> I am debugging my own changes in cs553x_nand driver so it is up to me of 
>> course. But can this behavior be explained in other way than nand driver 
>> bug? Broken BIOS/board?
>
> http://www.linux-mtd.infradead.org/faq/nand.html
>
> 	tglx

Thanks for the pointer - there are definitely still things I am not 
aware of. Currently it came out though that our BIOS contains support 
for NAND media with specific format. And if there isn't needed format in 
place - it creates one immediately at boot :)
Without that "feature" it seems to be OK. Annoying thing is that 
initializing says 'ECC error while reading bad block table'. I am not 
sure at moment how to handle this fact. But it is possible to 
flash_eraseall, nandwrite my_jffs2.img, mount and read it.

thanks,
Indrek