Re: UBI: infinite error loop

[Brian Foster <brian.foster@maxim-ic.com>]

matthieu.castet@parrot.com wrote:
> Patrick a écrit :
> > When I am doing an the ubiattach -p /dev/mtd4 command
> > I have the following infinite error loop:
>[ ... ]
> Look like it doesn't handle subpage reading :
> you have ecc error when reading 512 bytes at offset 512.

 Also, keep in mind read-after-write checks don't work with subpages,
 http://www.linux-mtd.infradead.org/faq/ubi.html#L_subpage_verify_fail
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I get "ubi_io_write: error -5 while writing 512 bytes to PEB 5:512"

If you have a 2048 bytes per NAND page device, and have
CONFIG_MTD_NAND_VERIFY_WRITE enabled in your kernel,
you will need to turn it off.  The code does not currently
(as of 2.6.26) perform verification of sub-page writes
correctly.  As UBI is one of the few users of sub-page
writes, not much else seems to be affected by this bug.
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 YES, I realize that is not your error, but this was
 something that badly tripped us up until an intense
 search-engine session ....  ;-\  (I have no idea if
 this has since been fixed or not?)

cheers!
	-blf-

-- 
Brian Foster
Principal MTS, Software        |  La Ciotat, France
Maxim Integrated Products      |  Web:  http://www.maxim-ic.com/