From: "Pali Rohár" <pali.rohar@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Tony Lindgren" <tony@atomide.com>, "Pavel Machek" <pavel@ucw.cz>,
"Frank Rowand" <frowand.list@gmail.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"Russell King - ARM Linux" <linux@arm.linux.org.uk>,
"Laura Abbott" <lauraa@codeaurora.org>,
"Grant Likely" <grant.likely@linaro.org>,
"Rob Herring" <robherring2@gmail.com>,
"Will Deacon" <will.deacon@arm.com>,
"Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>,
"Sebastian Reichel" <sre@debian.org>,
"Andreas Färber" <afaerber@suse.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Wed, 25 Nov 2015 22:44:28 +0100 [thread overview]
Message-ID: <201511252244.28797@pali> (raw)
In-Reply-To: <3245119.krc4KB3uae@wuerfel>
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On Wednesday 25 November 2015 22:29:53 Arnd Bergmann wrote:
> On Wednesday 25 November 2015 13:03:10 Tony Lindgren wrote:
> > * Arnd Bergmann <arnd@arndb.de> [151125 11:50]:
> > > On Wednesday 25 November 2015 10:16:44 Tony Lindgren wrote:
> > > > At least I don't have better solutions in mind.
> > >
> > > I would be happier if we could restrict this as much as possible
> > > to the boards that need it, as an opt-in. That way it doesn't
> > > become an ABI for people that don't already rely in this
> > > information. How about adding a check the code adds the
> > > linux,atags property to do it only for a whitelist of board
> > > numbers?
> >
> > Or populate /proc/atags only for the ones that need it from machine
> > specific init_early?
>
> That would also address my main concern about /proc/atags, but still
> leave the atags in /proc/device-tree/chosen/linux,atags, and it would
> be bad if someone who currently uses /proc/atags changes their code
> to use the other file instead of finding a proper solution.
>
> Arnd
Arnd, my question about proper solution reminds... Proprietary
bootloader which cannot be replaced (e.g. it is signed or do unknown
magic) provides information to booted kernel via custom specific ATAGs
fields. How userspace could properly read those custom information from
bootloader?
--
Pali Rohár
pali.rohar@gmail.com
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WARNING: multiple messages have this Message-ID (diff)
From: "Pali Rohár" <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: "Tony Lindgren" <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
"Pavel Machek" <pavel-+ZI9xUNit7I@public.gmane.org>,
"Frank Rowand"
<frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Russell King - ARM Linux"
<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
"Laura Abbott" <lauraa-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
"Grant Likely"
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"Rob Herring"
<robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Will Deacon" <will.deacon-5wv7dgnIgG8@public.gmane.org>,
"Ivaylo Dimitrov"
<ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Sebastian Reichel" <sre-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>,
"Andreas Färber" <afaerber-l3A5Bk7waGM@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Wed, 25 Nov 2015 22:44:28 +0100 [thread overview]
Message-ID: <201511252244.28797@pali> (raw)
In-Reply-To: <3245119.krc4KB3uae@wuerfel>
[-- Attachment #1: Type: Text/Plain, Size: 1451 bytes --]
On Wednesday 25 November 2015 22:29:53 Arnd Bergmann wrote:
> On Wednesday 25 November 2015 13:03:10 Tony Lindgren wrote:
> > * Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> [151125 11:50]:
> > > On Wednesday 25 November 2015 10:16:44 Tony Lindgren wrote:
> > > > At least I don't have better solutions in mind.
> > >
> > > I would be happier if we could restrict this as much as possible
> > > to the boards that need it, as an opt-in. That way it doesn't
> > > become an ABI for people that don't already rely in this
> > > information. How about adding a check the code adds the
> > > linux,atags property to do it only for a whitelist of board
> > > numbers?
> >
> > Or populate /proc/atags only for the ones that need it from machine
> > specific init_early?
>
> That would also address my main concern about /proc/atags, but still
> leave the atags in /proc/device-tree/chosen/linux,atags, and it would
> be bad if someone who currently uses /proc/atags changes their code
> to use the other file instead of finding a proper solution.
>
> Arnd
Arnd, my question about proper solution reminds... Proprietary
bootloader which cannot be replaced (e.g. it is signed or do unknown
magic) provides information to booted kernel via custom specific ATAGs
fields. How userspace could properly read those custom information from
bootloader?
--
Pali Rohár
pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: pali.rohar@gmail.com (Pali Rohár)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux, atags" entry
Date: Wed, 25 Nov 2015 22:44:28 +0100 [thread overview]
Message-ID: <201511252244.28797@pali> (raw)
In-Reply-To: <3245119.krc4KB3uae@wuerfel>
On Wednesday 25 November 2015 22:29:53 Arnd Bergmann wrote:
> On Wednesday 25 November 2015 13:03:10 Tony Lindgren wrote:
> > * Arnd Bergmann <arnd@arndb.de> [151125 11:50]:
> > > On Wednesday 25 November 2015 10:16:44 Tony Lindgren wrote:
> > > > At least I don't have better solutions in mind.
> > >
> > > I would be happier if we could restrict this as much as possible
> > > to the boards that need it, as an opt-in. That way it doesn't
> > > become an ABI for people that don't already rely in this
> > > information. How about adding a check the code adds the
> > > linux,atags property to do it only for a whitelist of board
> > > numbers?
> >
> > Or populate /proc/atags only for the ones that need it from machine
> > specific init_early?
>
> That would also address my main concern about /proc/atags, but still
> leave the atags in /proc/device-tree/chosen/linux,atags, and it would
> be bad if someone who currently uses /proc/atags changes their code
> to use the other file instead of finding a proper solution.
>
> Arnd
Arnd, my question about proper solution reminds... Proprietary
bootloader which cannot be replaced (e.g. it is signed or do unknown
magic) provides information to booted kernel via custom specific ATAGs
fields. How userspace could properly read those custom information from
bootloader?
--
Pali Roh?r
pali.rohar at gmail.com
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next prev parent reply other threads:[~2015-11-25 21:44 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 ` Pali Rohár [this message]
2015-11-25 21:44 ` 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 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Nicolas Pitre
2015-11-27 23:28 ` Nicolas Pitre
2015-11-27 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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