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 bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YID5b-0000a4-In for barebox@lists.infradead.org; Mon, 02 Feb 2015 09:14:40 +0000 Date: Mon, 2 Feb 2015 10:14:12 +0100 From: Sascha Hauer Message-ID: <20150202091412.GV12209@pengutronix.de> References: <20150129091229.GA424@gmail.com> <20150129092151.GE12209@pengutronix.de> <87k305o0cd.fsf@free.fr> <20150130074017.GP12209@pengutronix.de> <87lhkkm7a0.fsf@free.fr> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87lhkkm7a0.fsf@free.fr> 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: Access to first 0x1000 byte on imx53/imx6 To: Robert Jarzmik Cc: barebox@lists.infradead.org On Fri, Jan 30, 2015 at 07:51:19PM +0100, Robert Jarzmik wrote: > Sascha Hauer writes: > > > On Thu, Jan 29, 2015 at 08:25:54PM +0100, Robert Jarzmik wrote: > >> Sascha Hauer writes: > >> I think the solution in arch/arm/boards/mioa701/board.c (remapping the 0x0 > >> address) should work here : > >> docg3_iospace = map_io_sections(0x0, (void *)0xe0000000, 0x2000); > > > > We could create a /dev/zeropage with the code above. That would make the > > zero page generally available. I don't know if this is worth the effort > > though. > > Yeah, I don't know if it's worth it either. And how "big" should this > /dev/zeropage be (4k, 1M, ...) ? It should be one page, so 4k. But as Jan said, special casing the first page in /dev/mem sounds better. 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