From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out.bhp.t-online.de ([195.145.119.39]) by pentafluge.infradead.org with esmtp (Exim 4.14 #3 (Red Hat Linux)) id 19gRpm-0006YI-TO for ; Sat, 26 Jul 2003 17:23:50 +0100 Received: from ylva.bhp.t-online.de (ylva.ada.t-online.de [172.30.8.40]) 21 2002)) with SMTP id <0HIN00M4M46WQ8@smtp-out.bhp.t-online.de> for linux-mtd@lists.infradead.org; Sat, 26 Jul 2003 18:23:21 +0200 (MEST) Date: Sat, 26 Jul 2003 19:20:03 +0200 From: Thomas Gleixner In-reply-to: <1059232112.539.5.camel@lapdancer.baythorne.internal> To: David Woodhouse Message-id: <200307261920.03702.tglx@linutronix.de> MIME-version: 1.0 Content-disposition: inline References: <200307261339.13142.tglx@linutronix.de> <1059232112.539.5.camel@lapdancer.baythorne.internal> Content-type: text/plain; charset=iso-8859-15 Content-transfer-encoding: 7BIT cc: linux-mtd@lists.infradead.org cc: "J.D. Bakker" Subject: Re: Handling multiple NAND chips Reply-To: tglx@linutronix.de List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Saturday 26 July 2003 17:08, David Woodhouse wrote: > On Sat, 2003-07-26 at 07:39, Thomas Gleixner wrote: > > You can do this, but the question is, if it is really an advantage. > > Dunno. In general, interrupt-driven operation is an advantage over > polling -- it lets us get on with something else while we're waiting for > the flash, and come straight back to the flash driver when it's done. > Given the latencies involved on NAND, though, it might not really be > worth the effort -- but I'd like to investigate. For write it has really no advantage. All chips I have tested so far work near the min. timings. For erase it could be useful, as it can last a little bit longer. But I know for sure, that the current yield and some polling code has better performance than most ide drives. -- Thomas ________________________________________________________________________ linutronix - competence in embedded & realtime linux http://www.linutronix.de mail: tglx@linutronix.de