From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Wed, 13 Jun 2007 16:11:52 +1000 From: David Gibson To: Segher Boessenkool Subject: Re: [PATCH] powerpc: Create "rom" (MTD) device prpmc2800 Message-ID: <20070613061152.GF16148@localhost.localdomain> References: <8ac5664208e0f59329b62ac2138bbc8c@kernel.crashing.org> <466312C2.4090200@ru.mvista.com> <548a7e11ffb577f6395b8f5a9c2fba2d@kernel.crashing.org> <466323EF.5040807@ru.mvista.com> <1181228442.2785.60.camel@pmac.infradead.org> <18fbfbaf113ab76b602d279848d9b405@kernel.crashing.org> <20070612044459.GD4198@localhost.localdomain> <9e1a55ac71a2ecf5155d2fddf547025e@kernel.crashing.org> <20070613031615.GC16148@localhost.localdomain> <96f5b23c4f53e986e8caa2156f149cd8@kernel.crashing.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <96f5b23c4f53e986e8caa2156f149cd8@kernel.crashing.org> Cc: linuxppc-dev@ozlabs.org, linux-mtd@lists.infradead.org, David Woodhouse , Milton Miller List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, Jun 13, 2007 at 07:05:31AM +0200, Segher Boessenkool wrote: > >>> Of course, Ebony has flash which is JEDEC rather than CFI probed, so > >>> I > >>> have an interest in a binding for that, too. > >> > >> For JEDEC flash, you probably want extra properties > >> for manufacturing ID and chip ID. Also, you need > >> to describe the block sizes in some way (on CFI, this > >> can be probed; on JEDEC, not). Anything else? > > > > Hrm. At the moment it appears to work without supplying this > > information for the Ebony flash... I wonder if there are defaults in > > the mtd layer or something. > > MTD does a lot of heuristic probing. It is pretty good, > but it would be nice if you could skip that and hand it > the exact values it needs. Also, this information should > be in the device tree no matter what, even if Linux > doesn't use it yet ;-) I agree. Of course, this means figuring out what the values actually are for Ebony. I presently have no idea, since the heuristic probing appears to work without problem. -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson