From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: "Pali Rohár" <pali.rohar@gmail.com>
Cc: "Nicolas Pitre" <nicolas.pitre@linaro.org>,
"Tony Lindgren" <tony@atomide.com>,
"Arnd Bergmann" <arnd@arndb.de>,
linux-arm-kernel@lists.infradead.org,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>,
"Laura Abbott" <lauraa@codeaurora.org>,
"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: Tue, 15 Dec 2015 12:20:38 +0000 [thread overview]
Message-ID: <20151215122038.GI30871@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20151215093325.GK13531@pali>
On Tue, Dec 15, 2015 at 10:33:25AM +0100, Pali Rohár wrote:
> So am I understand correctly that solution would be to hack
> arch/arm/mm/mmu.c to not overwrite page at PHYS_OFFSET?
That's completely unnecessary: there are enough platform hooks to cope
with whatever the platform requires.
If you want to reserve the memory, then you have the ->reserve callback,
where you can call:
memblock_reserve(PHYS_OFFSET, PAGE_SIZE);
if you wish to prevent the first page being overwritten. You're then
responsible for freeing this page later in the boot sequence, or you
could just keep it around and refer to the atags in that page directly.
You could also just save_atags() in there, with a comment saying that
this is a work-around for N900 which needs the ATAGs saved, and this
is allowed in ->reserve as a special exception.
--
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Tue, 15 Dec 2015 12:20:38 +0000 [thread overview]
Message-ID: <20151215122038.GI30871@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20151215093325.GK13531@pali>
On Tue, Dec 15, 2015 at 10:33:25AM +0100, Pali Roh?r wrote:
> So am I understand correctly that solution would be to hack
> arch/arm/mm/mmu.c to not overwrite page at PHYS_OFFSET?
That's completely unnecessary: there are enough platform hooks to cope
with whatever the platform requires.
If you want to reserve the memory, then you have the ->reserve callback,
where you can call:
memblock_reserve(PHYS_OFFSET, PAGE_SIZE);
if you wish to prevent the first page being overwritten. You're then
responsible for freeing this page later in the boot sequence, or you
could just keep it around and refer to the atags in that page directly.
You could also just save_atags() in there, with a comment saying that
this is a work-around for N900 which needs the ATAGs saved, and this
is allowed in ->reserve as a special exception.
--
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-12-15 12:21 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 ` [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 ` Russell King - ARM Linux [this message]
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 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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