From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YeqnJ-0006T8-JH for linux-mtd@lists.infradead.org; Sun, 05 Apr 2015 20:05:22 +0000 Date: Sun, 5 Apr 2015 22:04:59 +0200 From: Pavel Machek To: Richard Weinberger Subject: Re: [PATCH V2] UBI: power cut emulation for testing Message-ID: <20150405200459.GA1118@amd> References: <1427410790-8855-1-git-send-email-david.oberhollenzer@sigma-star.at> <20150405193146.GA12132@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Cc: "linux-mtd@lists.infradead.org" , david.oberhollenzer@sigma-star.at, LKML List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sun 2015-04-05 21:49:27, Richard Weinberger wrote: > On Sun, Apr 5, 2015 at 9:31 PM, Pavel Machek wrote: > > On Thu 2015-03-26 23:59:50, david.oberhollenzer@sigma-star.at 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 > >> --- > >> 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? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html