Re: [PATCH V2] UBI: power cut emulation for testing
From: Pavel Machek
Date: Sun Apr 05 2015 - 16:26:33 EST
On Sun 2015-04-05 22:09:27, Richard Weinberger wrote:
> Am 05.04.2015 um 22:04 schrieb Pavel Machek:
> > On Sun 2015-04-05 21:49:27, Richard Weinberger wrote:
> >> On Sun, Apr 5, 2015 at 9:31 PM, Pavel Machek <pavel@xxxxxx> wrote:
> >>> On Thu 2015-03-26 23:59:50, david.oberhollenzer@xxxxxxxxxxxxx wrote:
> >>>> Emulate random power cuts by switching device to ro after a number of
> >>>> writes to allow simple power cut testing with nand-sim.
> >>>> Maximum and minimum number of successful writes before power cut and
> >>>> what kind of writes (EC header, VID header or none) to interrupt
> >>>> configurable via debugfs.
> >>>> Signed-off-by: David Oberhollenzer <david.oberhollenzer@xxxxxxxxxxxxx>
> >>>> ---
> >>>> V2: Remove broken check to prevent multiple triggering
> >>> Does NAND always finish write of full block during powerfail?
> >> Not sure if I correctly understand your question.
> >> Unless you don't have special hardware a write can be interrupted and
> >> can cause problems.
> > But this only emulates fail after a full block written, no?
> Emulating all aspects of real hardware is almost impossible.
I guess so. So maybe warning in the documentation somewhere that real
hardware is nastier than designed-to-be-nasty emulation would be
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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