From owner-freebsd-arm@FreeBSD.ORG  Tue Nov 25 19:06:18 2008
Return-Path: <owner-freebsd-arm@FreeBSD.ORG>
Delivered-To: arm@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id EC0AC1065670;
	Tue, 25 Nov 2008 19:06:18 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id AE94E8FC19;
	Tue, 25 Nov 2008 19:06:18 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from localhost (localhost [127.0.0.1])
	by harmony.bsdimp.com (8.14.2/8.14.1) with ESMTP id mAPJ3r55061842;
	Tue, 25 Nov 2008 12:03:53 -0700 (MST) (envelope-from imp@bsdimp.com)
Date: Tue, 25 Nov 2008 12:05:23 -0700 (MST)
Message-Id: <20081125.120523.-201316873.imp@bsdimp.com>
To: stas@FreeBSD.org
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <20081125220040.c8996e0b.stas@FreeBSD.org>
References: <20081125212409.3dab8178.stas@FreeBSD.org>
	<20081125.113647.1346821827.imp@bsdimp.com>
	<20081125220040.c8996e0b.stas@FreeBSD.org>
X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: arm@FreeBSD.org
Subject: Re: Code review request: boards on AT91
X-BeenThere: freebsd-arm@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Porting FreeBSD to the StrongARM Processor <freebsd-arm.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
	<mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm>
List-Post: <mailto:freebsd-arm@freebsd.org>
List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
	<mailto:freebsd-arm-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Nov 2008 19:06:19 -0000

In message: <20081125220040.c8996e0b.stas@FreeBSD.org>
            Stanislav Sedov <stas@FreeBSD.org> writes:
: -----BEGIN PGP SIGNED MESSAGE-----
: Hash: SHA1
: 
: On Tue, 25 Nov 2008 11:36:47 -0700 (MST)
: "M. Warner Losh" <imp@bsdimp.com> mentioned:
: 
: > : 
: > : I think we could pass the board type via a special kenv variable
: > : for now. I think it will work fine and applicable to all supported
: > : architectures. We could probably reuse board type constants that Linux
: > : kernel uses.
: > 
: > Right now that's passed in from uboot and other loaders in I think r3,
: > but I'd have to go look at some other code to be sure.
: > 
: 
: Well, I don't think we want to follow The Linux kernel argument passing
: paradigm... But using a simple kenv variable would be just fine.
: We have a patch ready for kenv/hints support in u-boot and in
: our arm port, and our loader could be used on arm with Rafal's
: u-boot API.

You are assuming that /boot/loader is always used.  In the cases where
it isn't, we need that value from r3.  when it is, a kenv could be
used.  This switching likely also needs to be configurable more easily
than it is now.

Warner