From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frank Rowand Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Date: Sat, 28 Nov 2015 13:02:29 -0800 Message-ID: <565A1665.2060504@gmail.com> References: <20150713131902.GH26485@atomide.com> <20151127132722.GA30871@n2100.arm.linux.org.uk> <20151127195148.GB30871@n2100.arm.linux.org.uk> <11537945.4HX4Y84tjV@wuerfel> <20151128123328.GC30871@n2100.arm.linux.org.uk> Reply-To: frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Nicolas Pitre Cc: Russell King - ARM Linux , Arnd Bergmann , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, =?ISO-8859-1?Q?Pali_Roh=E1r?= , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Ivaylo Dimitrov , Laura Abbott , Tony Lindgren , Sebastian Reichel , Will Deacon , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rob Herring , Pavel Machek , Grant Likely , linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, =?ISO-8859-1?Q?Andreas_F=E4rber?= , frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org List-Id: linux-omap@vger.kernel.org On 11/28/2015 9:34 AM, Nicolas Pitre wrote: > On Sat, 28 Nov 2015, Russell King - ARM Linux wrote: > >> On Fri, Nov 27, 2015 at 06:28:50PM -0500, Nicolas Pitre wrote: >>> On Fri, 27 Nov 2015, Arnd Bergmann wrote: >>> >>>> I don't mind creating the /proc/atags compatibility hack from the kernel >>>> for a DT based N700 kernel, as long as we limit it as much as we can >>>> to the machines that need it. Leaving a board file for the N700 in place >>>> that contains the procfs code (and not much more) seems reasonable >>>> here, as we are talking about a board specific hack and the whole point >>>> appears to be running unmodified user space. >>>> >>>> Regarding how to get the data into the kernel in the first place, my >>>> preferred choice would still be to have an intermediate bootloader >>>> such as pxa-impedance-matcher, but I won't complain if others are >>>> happy enough about putting it into the ATAGS compat code we already >>>> have, as long as it's limited to the boards we know need it. >>> >>> Assuming you have a N700 board file for special procfs code, then why >>> not getting at the atags in memory where the bootloader has put them >>> directly from that same board file? This way it'll really be limited to >>> the board we know needs it and the special exception will be contained >>> to that one file. Amongst the machine specific hooks, there is one that >>> gets invoked early during boot before those atags are overwritten. >> >> I've already suggested that. > > Good. And Arnd likes the idea too. So we might be converging at last > which is a good thing. It makes me happy too. -Frank -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html