From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
"Russell King - ARM Linux" <linux@arm.linux.org.uk>,
"Pali Rohár" <pali.rohar@gmail.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>,
"Laura Abbott" <lauraa@codeaurora.org>,
"Tony Lindgren" <tony@atomide.com>,
"Sebastian Reichel" <sre@debian.org>,
"Will Deacon" <will.deacon@arm.com>,
linux-kernel@vger.kernel.org,
"Rob Herring" <robherring2@gmail.com>,
"Pavel Machek" <pavel@ucw.cz>,
"Grant Likely" <grant.likely@linaro.org>,
linux-omap@vger.kernel.org,
"Frank Rowand" <frowand.list@gmail.com>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Fri, 27 Nov 2015 18:28:50 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.20.1511271817230.22569@knanqh.ubzr> (raw)
In-Reply-To: <11537945.4HX4Y84tjV@wuerfel>
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.
Nicolas
WARNING: multiple messages have this Message-ID (diff)
From: Nicolas Pitre <nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
"Russell King - ARM Linux"
<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
"Pali Rohár" <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Ivaylo Dimitrov"
<ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Laura Abbott" <lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
"Tony Lindgren" <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
"Sebastian Reichel" <sre-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>,
"Will Deacon" <will.deacon-5wv7dgnIgG8@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Rob Herring"
<robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Pavel Machek" <pavel-+ZI9xUNit7I@public.gmane.org>,
"Grant Likely"
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Frank Rowand"
<frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Andreas Färber" <afaerber-l3A5Bk7waGM@public.gmane.org>
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Fri, 27 Nov 2015 18:28:50 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.20.1511271817230.22569@knanqh.ubzr> (raw)
In-Reply-To: <11537945.4HX4Y84tjV@wuerfel>
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.
Nicolas
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WARNING: multiple messages have this Message-ID (diff)
From: nicolas.pitre@linaro.org (Nicolas Pitre)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Fri, 27 Nov 2015 18:28:50 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.20.1511271817230.22569@knanqh.ubzr> (raw)
In-Reply-To: <11537945.4HX4Y84tjV@wuerfel>
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.
Nicolas
next prev parent reply other threads:[~2015-11-27 23:28 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-06 20:26 [PATCH 0/5] ATAGs to DT patches Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-07-06 20:26 ` [PATCH 1/5] arm: devtree: Set system_rev from DT "/revision" Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-12-24 19:02 ` Pali Rohár
2015-12-24 19:02 ` Pali Rohár
2015-12-24 19:02 ` Pali Rohár
2015-12-28 21:01 ` Frank Rowand
2015-12-28 21:01 ` Frank Rowand
2015-12-28 21:01 ` Frank Rowand
2015-12-28 22:27 ` Arnd Bergmann
2015-12-28 22:27 ` Arnd Bergmann
2015-12-28 22:27 ` Arnd Bergmann
2016-01-05 11:37 ` Pali Rohár
2016-01-05 11:37 ` Pali Rohár
2016-01-05 11:37 ` Pali Rohár
2016-01-05 11:37 ` Pali Rohár
2016-01-05 11:45 ` Arnd Bergmann
2016-01-05 11:45 ` Arnd Bergmann
2016-01-05 11:45 ` Arnd Bergmann
2016-02-05 18:15 ` [PATCH] ARM: RX51: Set system_rev from ATAGS Ivaylo Dimitrov
2016-02-05 18:15 ` Ivaylo Dimitrov
2016-02-08 20:48 ` Tony Lindgren
2016-02-08 20:48 ` Tony Lindgren
2016-02-08 21:10 ` Pali Rohár
2016-02-08 21:10 ` Pali Rohár
2016-02-09 16:17 ` Tony Lindgren
2016-02-09 16:17 ` Tony Lindgren
2016-02-10 18:23 ` [PATCH v1] " Ivaylo Dimitrov
2016-02-10 18:23 ` Ivaylo Dimitrov
2016-02-11 0:19 ` Tony Lindgren
2016-02-11 0:19 ` Tony Lindgren
2015-07-06 20:26 ` [PATCH 2/5] arm: boot: convert ATAG_REVISION to DT "/revision" entry Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-07-06 20:26 ` [PATCH 3/5] arm: atags: Fix declaration of function save_atags Pali Rohár
2015-07-06 20:26 ` Pali Rohár
2015-07-06 20:26 ` [PATCH 4/5] arm: devtree: Read ATAGs structure from DT "/chosen/linux,atags" entry Pali Rohár
2015-07-06 20:26 ` [PATCH 4/5] arm: devtree: Read ATAGs structure from DT "/chosen/linux, atags" entry Pali Rohár
2015-07-06 20:26 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-07-06 20:26 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-07-07 11:32 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux
2015-07-07 11:32 ` Russell King - ARM Linux
2015-07-07 11:58 ` Pali Rohár
2015-07-07 11:58 ` Pali Rohár
2015-07-13 13:19 ` Tony Lindgren
2015-07-13 13:19 ` Tony Lindgren
2015-10-12 20:16 ` Tony Lindgren
2015-10-12 20:16 ` Tony Lindgren
2015-10-12 20:25 ` Pali Rohár
2015-10-12 20:25 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-10-12 20:45 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Tony Lindgren
2015-10-12 20:45 ` Tony Lindgren
2015-10-13 14:37 ` Pali Rohár
2015-10-13 14:37 ` Pali Rohár
2015-11-05 11:40 ` Pali Rohár
2015-11-05 11:40 ` Pali Rohár
2015-11-05 16:17 ` Tony Lindgren
2015-11-05 16:17 ` Tony Lindgren
2015-11-12 1:10 ` Frank Rowand
2015-11-12 1:10 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand
2015-11-22 6:51 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pavel Machek
2015-11-22 6:51 ` Pavel Machek
2015-11-23 14:45 ` Pali Rohár
2015-11-23 14:45 ` Pali Rohár
2015-11-23 14:45 ` Pali Rohár
2015-11-25 18:16 ` Tony Lindgren
2015-11-25 18:16 ` Tony Lindgren
2015-11-25 18:16 ` Tony Lindgren
2015-11-25 19:48 ` Arnd Bergmann
2015-11-25 19:48 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-11-25 21:03 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Tony Lindgren
2015-11-25 21:03 ` Tony Lindgren
2015-11-25 21:03 ` Tony Lindgren
2015-11-25 21:29 ` Arnd Bergmann
2015-11-25 21:29 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-11-25 21:44 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-11-25 21:51 ` Arnd Bergmann
2015-11-25 21:51 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-11-25 22:00 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-11-25 22:00 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-11-26 4:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Frank Rowand
2015-11-26 4:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand
2015-11-26 9:07 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-11-26 9:07 ` Pali Rohár
2015-11-26 20:39 ` Tony Lindgren
2015-11-26 20:39 ` Tony Lindgren
2015-11-26 20:39 ` Tony Lindgren
2015-11-26 21:12 ` Ivaylo Dimitrov
2015-11-26 21:12 ` Ivaylo Dimitrov
2015-11-27 8:38 ` Pali Rohár
2015-11-27 8:38 ` Pali Rohár
2015-11-27 8:44 ` Michael Trimarchi
2015-11-27 8:44 ` Michael Trimarchi
2015-11-27 8:44 ` Michael Trimarchi
2015-11-27 8:52 ` Michael Trimarchi
2015-11-27 8:52 ` Michael Trimarchi
2015-11-27 14:51 ` Tony Lindgren
2015-11-27 14:51 ` Tony Lindgren
2015-11-27 13:27 ` Russell King - ARM Linux
2015-11-27 13:27 ` Russell King - ARM Linux
2015-11-27 19:51 ` Russell King - ARM Linux
2015-11-27 19:51 ` Russell King - ARM Linux
2015-11-27 19:51 ` Russell King - ARM Linux
2015-11-27 21:06 ` Arnd Bergmann
2015-11-27 21:06 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-11-27 23:28 ` Nicolas Pitre [this message]
2015-11-27 23:28 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Nicolas Pitre
2015-11-27 23:28 ` Nicolas Pitre
2015-11-28 12:27 ` Arnd Bergmann
2015-11-28 12:27 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-11-28 12:27 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Arnd Bergmann
2015-11-28 12:54 ` Russell King - ARM Linux
2015-11-28 12:54 ` Russell King - ARM Linux
2015-11-28 12:54 ` Russell King - ARM Linux
2015-11-28 12:33 ` Russell King - ARM Linux
2015-11-28 12:33 ` Russell King - ARM Linux
2015-11-28 17:34 ` Nicolas Pitre
2015-11-28 17:34 ` Nicolas Pitre
2015-11-28 21:02 ` Frank Rowand
2015-11-28 21:02 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Frank Rowand
2015-11-28 21:02 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Frank Rowand
2015-11-29 18:09 ` Russell King - ARM Linux
2015-11-29 18:09 ` Russell King - ARM Linux
2015-11-29 18:09 ` Russell King - ARM Linux
2015-11-29 18:19 ` Pali Rohár
2015-11-29 18:19 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-11-29 23:13 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux
2015-11-29 23:13 ` Russell King - ARM Linux
2015-11-30 0:09 ` Nicolas Pitre
2015-11-30 0:09 ` Nicolas Pitre
2015-11-30 0:15 ` Pali Rohár
2015-11-30 0:15 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Pali Rohár
2015-11-30 0:15 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Pali Rohár
2015-11-30 15:23 ` Tony Lindgren
2015-11-30 15:23 ` Tony Lindgren
2015-11-30 15:23 ` Tony Lindgren
2015-11-30 15:39 ` Pali Rohár
2015-11-30 15:39 ` Pali Rohár
2015-11-30 15:39 ` Pali Rohár
2015-11-30 16:09 ` Nicolas Pitre
2015-11-30 16:09 ` Nicolas Pitre
2015-12-15 9:33 ` Pali Rohár
2015-12-15 9:33 ` Pali Rohár
2015-12-15 11:04 ` Arnd Bergmann
2015-12-15 11:04 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry Arnd Bergmann
2015-12-15 12:20 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Russell King - ARM Linux
2015-12-15 12:20 ` Russell King - ARM Linux
2015-12-15 17:24 ` Nicolas Pitre
2015-12-15 17:24 ` Nicolas Pitre
2015-12-15 17:24 ` Nicolas Pitre
2015-12-23 14:54 ` Ivaylo Dimitrov
2015-12-23 14:54 ` Ivaylo Dimitrov
2015-11-28 4:06 ` [PATCH 0/5] ATAGs to DT patches Frank Rowand
2015-11-28 4:06 ` Frank Rowand
2015-11-28 5:55 ` Frank Rowand
2015-11-28 5:55 ` Frank Rowand
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