From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sascha Hauer Subject: Re: [PATCHv2 1/1] mtd: gpmi: make blockmark swapping optional Date: Fri, 28 Mar 2014 10:00:23 +0100 Message-ID: <20140328090023.GB17250@pengutronix.de> References: <1395399017-19005-1-git-send-email-LW@KARO-electronics.de> <20140324095902.GB11377@localhost> <20140326095156.3e5585b8@ipc1.ka-ro> <5332AEE7.2040402@freescale.com> <20140326125502.0e8d0657@ipc1.ka-ro> <20140327095956.GA29623@localhost> <20140327132109.06258526@ipc1.ka-ro> <5334D9F7.2030001@freescale.com> <20140328091646.1ce03f90@ipc1.ka-ro> <53353524.9020605@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <53353524.9020605@freescale.com> Sender: linux-doc-owner@vger.kernel.org To: Huang Shijie Cc: Lothar =?iso-8859-15?Q?Wa=DFmann?= , Fabio Estevam , Mark Rutland , Brian Norris , Russell King , Pawel Moll , Arnd Bergmann , Ian Campbell , Artem Bityutskiy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Rob Herring , linux-mtd@lists.infradead.org, Shawn Guo , Rob Landley , Kumar Gala , Shawn Guo , David Woodhouse , Sascha Hauer , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org On Fri, Mar 28, 2014 at 04:39:00PM +0800, Huang Shijie wrote: > =E4=BA=8E 2014=E5=B9=B403=E6=9C=8828=E6=97=A5 16:16, Lothar Wa=C3=9Fm= ann =E5=86=99=E9=81=93: > >Still there is no need for the Linux NAND driver to be able to read = or > >write partitions in a format that the Boot ROM can understand. Thus = it > If you do not use the NAND boot, there really no need to do so. >=20 > Since you need the NAND boot, we should enable the swapping for imx28= =2E > >is perfectly legal to allow disregarding the BB marks and solely rel= y on > >a flash based BBT. > > > The BB mark is in the page 0 of a NAND block. But the swapping can > occur in _each_ page of > a NAND block, _NOT_ only the page 0. >=20 > I think you are confusing at these two things. I think you are confusing two things. If Lothar: - disables swapping of BB marks in the FCB the ROM won't swap bytes. - writes data without swapping - Uses a DBBT for telling the ROM code where bad blocks are - uses a Flash BBT for mtd Then everything should work just fine. Sascha --=20 Pengutronix e.K. | = | Industrial Linux Solutions | http://www.pengutronix.de/= | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 = | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-555= 5 |