From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from blood.actrix.co.nz ([203.96.16.160]) by pentafluge.infradead.org with esmtp (Exim 4.22 #5 (Red Hat Linux)) id 1A9WoC-00007r-Ek for ; Tue, 14 Oct 2003 22:34:24 +0100 From: Charles Manning To: tharbaugh@lnxi.com, Magnus =?iso-8859-1?q?M=E5rtensson?= Date: Wed, 15 Oct 2003 10:39:03 +1300 References: <3C6BEE8B5E1BAC42905A93F13004E8AB03202232@mailse01.axis.se> <1066152707.10573.20.camel@tubarao> In-Reply-To: <1066152707.10573.20.camel@tubarao> MIME-Version: 1.0 Message-Id: <20031014213315.CA9124D6D@blood.actrix.co.nz> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit cc: linux-mtd@lists.infradead.org Subject: Re: word line disturbance Reply-To: manningc2@actrix.gen.nz List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I'm using the flash embedded in a AT91FR4042 (single chip ARM7-based micro + 512kB flash + 256kB RAM). The flash is essentially an AT49xV4096A. This device has 4 sectors: 1x16kB "boot", 2x8kB "parameter" and 1x480kB "application". The datasheet/appnote warns that reprogramming the boot can impact other sectors. Also, reprogramming the application area can disturb the parameter areas. At first I just blew this off as just a theoretical possibility, but found that these disturbances do occur on a regular basis (seen on 5 out of 5 proto devices) - particularly upgrading the application area corrupting the parameter areas. -- Charles