From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: Re: [PATCH 2/3] mtd: davinci-nand: add dts property for NAND_NO_SUBPAGE_WRITE option Date: Thu, 20 Mar 2014 14:02:39 -0400 Message-ID: <532B2D3F.6050004@ti.com> References: <1395335184-4745-1-git-send-email-ivan.khoronzhuk@ti.com> <1395335184-4745-3-git-send-email-ivan.khoronzhuk@ti.com> <532B2183.2080309@ti.com> <20140320172912.GW31517@norris-Latitude-E6410> <532B2766.6090506@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Warner Losh Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, grygorii.strashko@ti.com, Russell King - ARM Linux , pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, linux-mtd@lists.infradead.org, Murali Karicheri , rob@landley.net, galak@codeaurora.org, Ivan Khoronzhuk , Brian Norris , David Woodhouse , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org On Thursday 20 March 2014 01:44 PM, Warner Losh wrote: > > On Mar 20, 2014, at 11:37 AM, Santosh Shilimkar wrote: > >> >> >> On Thursday 20 March 2014 01:29 PM, Brian Norris wrote: >>> On Thu, Mar 20, 2014 at 01:12:35PM -0400, Santosh Shilimkar wrote: >>>> Boris, >>> >>> Who's Boris? And why should Boris be taking this patch? It's an MTD >>> patch. >>> >> I got your name completely wrong. Sorry.... >> >>>> On Thursday 20 March 2014 01:06 PM, Ivan Khoronzhuk wrote: >>>>> From: Murali Karicheri >>>>> >>>>> After testing NAND flash with ubifs for k2hk-emv board were committed >>>>> that flash doesn't support subpage writing, so we can fix it by >>>>> adding a property to disable subpage write. >>> >>> What flash? We try to autodetect NAND as much as possible. Perhaps we >>> should be adding infrastructure support instead of hacking it with a DT >>> property. >>> >> We can't auto detect it and thats why the DT approach was taken. We >> will double check that. > > I though sub page writing was one of the fields in the onfi and/or jedec(toggle) meta data structures. Have you looked there? > Am not sure if I follow you. The limitation is from the TI NAND controller(AEMIF) and not the NAND memory. regards, Santosh