Re: cat file > /dev/mtd0 works but after position 512

Indrek Kruusa
2006-06-14T10:03:03Z

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