From owner-freebsd-ppc@FreeBSD.ORG  Tue Dec 19 01:48:45 2006
Return-Path: <owner-freebsd-ppc@FreeBSD.ORG>
X-Original-To: ppc@FreeBSD.org
Delivered-To: freebsd-ppc@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id D9AFF16A40F
	for <ppc@FreeBSD.org>; Tue, 19 Dec 2006 01:48:45 +0000 (UTC)
	(envelope-from grehan@freebsd.org)
Received: from dommail.onthenet.com.au (dommail.OntheNet.com.au [203.13.70.57])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 78E5A43CA2
	for <ppc@FreeBSD.org>; Tue, 19 Dec 2006 01:48:43 +0000 (GMT)
	(envelope-from grehan@freebsd.org)
Received: from [10.33.24.110] (nat-198-95-226-228.netapp.com [198.95.226.228])
	by dommail.onthenet.com.au (MOS 3.5.7-GR)
	with ESMTP id CKK21395 (AUTH peterg@ptree32.com.au);
	Tue, 19 Dec 2006 11:47:36 +1000 (EST)
Message-ID: <458744D4.3060007@freebsd.org>
Date: Mon, 18 Dec 2006 17:48:04 -0800
From: Peter Grehan <grehan@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.8b) Gecko/20051014
MIME-Version: 1.0
To: Marcel Moolenaar <xcllnt@mac.com>
References: <DE8E70B1-9E3F-41E8-8502-AA374BFB150C@mac.com>	<45873A21.8020304@freebsd.org>
	<D50A4BB7-68CA-4953-8956-7CE4B30EEA83@mac.com>
In-Reply-To: <D50A4BB7-68CA-4953-8956-7CE4B30EEA83@mac.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: ppc@FreeBSD.org
Subject: Re: Adding new PowerPC platforms to the build
X-BeenThere: freebsd-ppc@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Porting FreeBSD to the PowerPC <freebsd-ppc.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ppc>,
	<mailto:freebsd-ppc-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ppc>
List-Post: <mailto:freebsd-ppc@freebsd.org>
List-Help: <mailto:freebsd-ppc-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ppc>,
	<mailto:freebsd-ppc-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 19 Dec 2006 01:48:45 -0000

> There's at least 1 gotcha: I think the ABI for embedded space is
> different from server space (Book III-E vs Book III-S). Think
> floating-point. MI code that is intended to run on a Book III-S
> ISA processor should use hardware FP. MI code that is intended
> to run on a Book III-E ISA processor cannot.

  Sure.

> For example, the following seems quite user-friendly and intuitive:
>     make release TARGET_ARCH=powerpc TARGET=server
> or
>     make release TARGET_ARCH=powerpc TARGET=embedded
> 
> and it does solve the biggest problem we're facing. Would this be
> so bad?

  Perhaps a better distinction is a default value of 'server', and an 
override of TARGET=softfp since there are a large class of embedded PPC 
cpus that can do floating point.

> Also, I don't want to assume that whatever we do should be done in
> the same way as pc98 and sun4u has been done. I think they have set
> a bad example.

  Agreed 100%.

later,

Peter.