* Verify-after-write on sub-pages
@ 2011-01-27 15:51 David Lambert
2011-01-29 16:16 ` Artem Bityutskiy
0 siblings, 1 reply; 2+ messages in thread
From: David Lambert @ 2011-01-27 15:51 UTC (permalink / raw)
To: linux-mtd
I am working on a project that requires high reliability of logged data
which is written to a UBI file system on NAND. I have observed one
hardware failure mode at elevated temperatures where some chips report
that a write was successful even though a subsequent read indicates that
this was not true. To mitigate this I enabled
CONFIG_MTD_NAND_VERIFY_WRITE. Unfortunately I found this does not work
on sub-pages which are used by UBI. As a workaround I have forced UBI
not to use sub-pages, but I was curious if either there were plans to
add this feature, or if anyone was working on implementing it?
Regards,
Dave.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Verify-after-write on sub-pages
2011-01-27 15:51 Verify-after-write on sub-pages David Lambert
@ 2011-01-29 16:16 ` Artem Bityutskiy
0 siblings, 0 replies; 2+ messages in thread
From: Artem Bityutskiy @ 2011-01-29 16:16 UTC (permalink / raw)
To: David Lambert; +Cc: linux-mtd
On Thu, 2011-01-27 at 09:51 -0600, David Lambert wrote:
> I am working on a project that requires high reliability of logged data
> which is written to a UBI file system on NAND. I have observed one
> hardware failure mode at elevated temperatures where some chips report
> that a write was successful even though a subsequent read indicates that
> this was not true. To mitigate this I enabled
> CONFIG_MTD_NAND_VERIFY_WRITE. Unfortunately I found this does not work
> on sub-pages which are used by UBI. As a workaround I have forced UBI
> not to use sub-pages, but I was curious if either there were plans to
> add this feature, or if anyone was working on implementing it?
Yes, CONFIG_MTD_NAND_VERIFY_WRITE is broken sub-pages for very long
time. I doubt anyone is fixing this, you have a chance to do this :-)
--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-01-27 15:51 Verify-after-write on sub-pages David Lambert
2011-01-29 16:16 ` Artem Bityutskiy
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