From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e32.co.us.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 6F564DE0B8 for ; Thu, 27 Mar 2008 12:11:43 +1100 (EST) Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e32.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id m2R1A5TD003559 for ; Wed, 26 Mar 2008 21:10:05 -0400 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v8.7) with ESMTP id m2R1BaQF127794 for ; Wed, 26 Mar 2008 19:11:36 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m2R1BZkt023221 for ; Wed, 26 Mar 2008 19:11:36 -0600 Date: Wed, 26 Mar 2008 20:08:57 -0500 From: Josh Boyer To: Steve Heflin Subject: Re: ppc platform for AMCC-440EPx - ELDK to the rescue Message-ID: <20080326200857.054078f5@zod.rchland.ibm.com> In-Reply-To: <20080326130837.762DBDE2FB@ozlabs.org> References: <20080326130837.762DBDE2FB@ozlabs.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, 26 Mar 2008 09:08:03 -0400 Steve Heflin wrote: > FINALLY the > early debugging console output worked, which doesn't work at all > using the powerpc platform (and yes, I had the correct port address > configured). It should work. It did when the board support was first brought in to arch/powerpc. If it doesn't now, I consider that a regression that needs fixing, at least for Sequoia itself. > Looking back at the powerpc platform, I don't see how to disable the > Host Bridge initialization without disabling the entire PCI > bus. This board does have 2 devices hooked on the PCI bus, just no > need for a Host Bridge. As Scott said, how would you talk to any PCI device without the host bridge being configured and enabled? > Also, I fail to see what the DTS virtualization layer of the hardware > buys us. When debugging, it's so much harder to use than the ppc > platform's straight forward and standard methodologies. I can't There are tradeoffs, yes. > understand to goal to eliminate the ppc platform, especially given > the fact that DENX's ELDK is still using it with Linux 2.6.24.2 !! The ELDK uses both arch/ppc and arch/powerpc. I consider them quite reasonable people, and foresee them eventually switching to arch/powerpc over time. In fact, their efforts are a large part of the continued progress of 4xx on arch/powerpc. josh