From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 13 Apr 2007 21:48:18 +1000 From: David Gibson To: Arnd Bergmann Subject: Re: [PATCH 0/7] Kconfig cleanup part II Message-ID: <20070413114818.GC17568@localhost.localdomain> References: <200704131337.08029.arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <200704131337.08029.arnd@arndb.de> Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, Apr 13, 2007 at 01:37:07PM +0200, Arnd Bergmann wrote: > On Friday 13 April 2007, Kumar Gala wrote: > > Here the second part of the Kconfig cleanup to move all the > > platform/*/Kconfig to be sourced by platform/Kconfig.  Plus some other > > minor cleanups. > > Nice patches, I had thought about doing these as well after > I have cleaned up the CPU selection. > > Two questions though: > - Is there a technical reason why we want to disallow building > a kernel that contains a combination of 6xx, 83xx, 86xx and > embedded6xx platforms, or are there only bugs that make it > impossible? > > - I'm still not sure whether platform selection or cpu selection > should come first, three options I can think of are: > 1. CPU first, then platform: > you might choose to build a kernel for 970 exclusively, which > would allow you to select powermac, pseries and maple but no > other platforms. > 2. Platform first, the CPU: > You might select pseries as the only platform, and then get > presented with the choice between power3 to power6, rs64 > and 970, but not cell or pa6t. > 3. platform and CPU depend on instruction set, but not on each other, > You only choose between powerpc64, 4xx, 6xx, e200, e500 or 8xx. > This would allow nonworking setups though, like a 83xx platform > with a 601 cpu or a ps3 with power5 cpu. I would suggest CPU family first (where "family" mostly corresponds to MMU design: 4xx, 44x, classic32, ppc64 etc.). Then platforms, with any combination allowable from the selected CPU family. Specific CPU models would usually be implied by platform selection. -- 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