From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UZMgs-0006Cb-7K for barebox@lists.infradead.org; Mon, 06 May 2013 14:46:59 +0000 Date: Mon, 6 May 2013 16:46:34 +0200 From: Sascha Hauer Message-ID: <20130506144634.GH32299@pengutronix.de> References: <1367599871-28479-1-git-send-email-thomas.petazzoni@free-electrons.com> <1367599871-28479-5-git-send-email-thomas.petazzoni@free-electrons.com> <20130506160916.04c7bfdc@skate> <20130506143030.GF32299@pengutronix.de> <20130506163424.4e398333@skate> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20130506163424.4e398333@skate> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH 4/7] arm: initial support for Marvell Armada 370/XP SoCs To: Thomas Petazzoni Cc: Lior Amsalem , barebox@lists.infradead.org, Ezequiel Garcia , Willy Tarreau On Mon, May 06, 2013 at 04:34:24PM +0200, Thomas Petazzoni wrote: > Dear Sascha Hauer, > > On Mon, 6 May 2013 16:30:30 +0200, Sascha Hauer wrote: > > > > ... and here, I'm directly poking at physical addresses, but it seems > > > like Barebox can run with the MMU enabled. Should I be mapping those > > > registers before accessing them? > > > > We use the MMU, but we use a 1:1 mapping. The SDRAM is mapped cached and > > the rest is mapped uncached. This means you can simply access all > > registers without mapping them > > Ok, thanks. So you're not overly chocked by those readl() poking > directly at physical addresses, if I understand correctly. Not at all, we do this everywhere. There is a tendency to turn units into proper drivers though as drivers show up in the 'iomem' command and with drivers it's generally easier to abstract between different SoCs. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox