From: Nicolas Pitre <nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
To: Mitch Bradley <wmb-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
Cc: "devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org"
<devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: Where to put a large bootloader-supplied device tree on ARM ?
Date: Thu, 12 Jul 2012 14:16:01 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.02.1207121411180.14068@xanadu.home> (raw)
In-Reply-To: <4FFE743B.6080504-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
On Wed, 11 Jul 2012, Mitch Bradley wrote:
> On 7/8/2012 6:30 PM, Nicolas Pitre wrote:
> > On Fri, 6 Jul 2012, Mitch Bradley wrote:
> >
> >> For now, I'm putting the initrd at the end of memory and the dtb
> >> below that. That seems to work, but I'm unsure whether or not
> >> I'm just "getting lucky".
> >
> > That's also perfectly fine.
>
> Alas, that worked for machines with 512 MiB of main memory, but failed
> on 1 GiB machines. My guess is that, when the initrd and dtb are near
> the top of a 1 GiB memory, the virtual address gets too near the top of
> the kernel's 1 GiB of virtual space (which starts at 0xc0000000),
> perhaps colliding with the VMALLOC space.
Indeed, that won't work in that case.
> Putting them just below the 128 MiB boundary seems to work.
Or at the 128MB mark, or any location between 64MB and 512MB should be
fine in practice.
Nicolas
WARNING: multiple messages have this Message-ID (diff)
From: nico@fluxnic.net (Nicolas Pitre)
To: linux-arm-kernel@lists.infradead.org
Subject: Where to put a large bootloader-supplied device tree on ARM ?
Date: Thu, 12 Jul 2012 14:16:01 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.02.1207121411180.14068@xanadu.home> (raw)
In-Reply-To: <4FFE743B.6080504@firmworks.com>
On Wed, 11 Jul 2012, Mitch Bradley wrote:
> On 7/8/2012 6:30 PM, Nicolas Pitre wrote:
> > On Fri, 6 Jul 2012, Mitch Bradley wrote:
> >
> >> For now, I'm putting the initrd at the end of memory and the dtb
> >> below that. That seems to work, but I'm unsure whether or not
> >> I'm just "getting lucky".
> >
> > That's also perfectly fine.
>
> Alas, that worked for machines with 512 MiB of main memory, but failed
> on 1 GiB machines. My guess is that, when the initrd and dtb are near
> the top of a 1 GiB memory, the virtual address gets too near the top of
> the kernel's 1 GiB of virtual space (which starts at 0xc0000000),
> perhaps colliding with the VMALLOC space.
Indeed, that won't work in that case.
> Putting them just below the 128 MiB boundary seems to work.
Or at the 128MB mark, or any location between 64MB and 512MB should be
fine in practice.
Nicolas
next prev parent reply other threads:[~2012-07-12 18:16 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-03 14:22 [PATCH v2 00/12] IRQ, GPIO SPI, I2C, etc DTC support Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
[not found] ` <1341325365-21393-1-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-03 14:22 ` [PATCH v2 01/12] ARM: Orion: DT support for IRQ and GPIO Controllers Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-05 8:15 ` Andrew Lunn
[not found] ` <1341325365-21393-2-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 9:02 ` Thomas Petazzoni
2012-07-05 9:02 ` Thomas Petazzoni
2012-07-05 9:48 ` Andrew Lunn
2012-07-05 9:48 ` Andrew Lunn
2012-07-05 10:11 ` Arnaud Patard
2012-07-05 10:11 ` Arnaud Patard (Rtp)
[not found] ` <87sjd6ikkj.fsf-0gaJ4kiyQU6khWr4QmshqB2eb7JE58TQ@public.gmane.org>
2012-07-05 10:20 ` Thomas Petazzoni
2012-07-05 10:20 ` Thomas Petazzoni
2012-07-05 10:38 ` Arnaud Patard
2012-07-05 10:38 ` Arnaud Patard (Rtp)
[not found] ` <87liiyijb8.fsf-0gaJ4kiyQU6khWr4QmshqB2eb7JE58TQ@public.gmane.org>
2012-07-05 11:42 ` Thomas Petazzoni
2012-07-05 11:42 ` Thomas Petazzoni
2012-07-05 11:48 ` Andrew Lunn
2012-07-05 11:48 ` Andrew Lunn
[not found] ` <20120705114815.GT17534-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 12:09 ` Sebastian Hesselbarth
2012-07-05 12:09 ` Sebastian Hesselbarth
[not found] ` <20120705094824.GO17534-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 10:10 ` Thomas Petazzoni
2012-07-05 10:10 ` Thomas Petazzoni
2012-07-05 10:25 ` Andrew Lunn
2012-07-05 10:25 ` Andrew Lunn
2012-07-05 12:58 ` Thomas Petazzoni
2012-07-05 12:58 ` Thomas Petazzoni
2012-07-05 13:15 ` Andrew Lunn
2012-07-05 13:15 ` Andrew Lunn
[not found] ` <20120705131522.GW17534-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 13:28 ` Thomas Petazzoni
2012-07-05 13:28 ` Thomas Petazzoni
2012-07-05 13:33 ` Andrew Lunn
2012-07-05 13:36 ` Thomas Petazzoni
2012-07-05 12:25 ` Arnd Bergmann
2012-07-05 12:25 ` Arnd Bergmann
[not found] ` <201207051225.55390.arnd-r2nGTMty4D4@public.gmane.org>
2012-07-05 13:08 ` Andrew Lunn
2012-07-05 13:08 ` Andrew Lunn
[not found] ` <20120705130819.GV17534-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 13:47 ` Arnd Bergmann
2012-07-05 13:47 ` Arnd Bergmann
[not found] ` <201207051347.38887.arnd-r2nGTMty4D4@public.gmane.org>
2012-07-05 13:54 ` Andrew Lunn
2012-07-05 13:54 ` Andrew Lunn
[not found] ` <20120705135449.GZ17534-g2DYL2Zd6BY@public.gmane.org>
2012-07-05 15:47 ` Arnd Bergmann
2012-07-05 15:47 ` Arnd Bergmann
2012-07-05 14:14 ` Sebastian Hesselbarth
2012-07-05 14:14 ` Sebastian Hesselbarth
[not found] ` <4FF5A15A.8070309-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-07-05 14:43 ` Andrew Lunn
2012-07-05 14:43 ` Andrew Lunn
2012-07-05 14:54 ` Arnd Bergmann
2012-07-05 14:54 ` Arnd Bergmann
[not found] ` <201207051454.24475.arnd-r2nGTMty4D4@public.gmane.org>
2012-07-05 15:51 ` Sebastian Hesselbarth
2012-07-05 15:51 ` Sebastian Hesselbarth
[not found] ` <4FF5B7F9.9020507-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
2012-07-05 16:30 ` Arnaud Patard
2012-07-05 16:30 ` Arnaud Patard (Rtp)
2012-07-05 16:16 ` Andrew Lunn
2012-07-05 16:16 ` Andrew Lunn
[not found] ` <20120705161600.GA28860-g2DYL2Zd6BY@public.gmane.org>
2012-07-06 20:08 ` Arnd Bergmann
2012-07-06 20:08 ` Arnd Bergmann
[not found] ` <201207062008.23952.arnd-r2nGTMty4D4@public.gmane.org>
2012-07-06 21:00 ` Andrew Lunn
2012-07-06 21:00 ` Andrew Lunn
[not found] ` <20120706210009.GC11470-g2DYL2Zd6BY@public.gmane.org>
2012-07-07 0:24 ` Where to put a large bootloader-supplied device tree on ARM ? Mitch Bradley
2012-07-07 0:24 ` Mitch Bradley
[not found] ` <4FF781D8.3040206-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-07-07 1:23 ` David VomLehn (dvomlehn)
2012-07-07 1:23 ` David VomLehn (dvomlehn)
[not found] ` <2966DB01BC317A4DA23684BA0F653415013701-WE/xwOPrfQKHONfmNwMhBaBKnGwkPULj@public.gmane.org>
2012-07-07 1:59 ` Mitch Bradley
2012-07-07 1:59 ` Mitch Bradley
[not found] ` <4FF7980E.7050705-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-07-09 4:30 ` Nicolas Pitre
2012-07-09 4:30 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.02.1207090015270.31100-QuJgVwGFrdf/9pzu0YdTqQ@public.gmane.org>
2012-07-12 6:52 ` Mitch Bradley
2012-07-12 6:52 ` Mitch Bradley
[not found] ` <4FFE743B.6080504-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-07-12 18:16 ` Nicolas Pitre [this message]
2012-07-12 18:16 ` Nicolas Pitre
2012-07-12 20:34 ` Rob Herring
2012-07-12 20:34 ` [U-Boot] " Rob Herring
2012-07-12 20:34 ` Rob Herring
2012-07-12 21:38 ` Albert ARIBAUD
2012-07-12 21:38 ` [U-Boot] " Albert ARIBAUD
2012-07-12 21:38 ` Albert ARIBAUD
2012-07-12 21:47 ` Wolfgang Denk
2012-07-12 21:47 ` [U-Boot] " Wolfgang Denk
2012-07-12 21:47 ` Wolfgang Denk
2012-07-13 1:28 ` Rob Herring
2012-07-13 1:28 ` [U-Boot] " Rob Herring
2012-07-13 1:28 ` Rob Herring
[not found] ` <4FFF79B6.6040508-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-07-13 6:45 ` Albert ARIBAUD
2012-07-13 6:45 ` Albert ARIBAUD
2012-07-13 6:45 ` Albert ARIBAUD
2012-07-05 18:36 ` [PATCH v2 01/12] ARM: Orion: DT support for IRQ and GPIO Controllers Mitch Bradley
2012-07-05 18:36 ` Mitch Bradley
2012-07-03 14:22 ` [PATCH v2 02/12] SPI: Refactor spi-orion to use SPI framework queue Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 03/12] spi-orion: remove uneeded spi_info Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 04/12] spi-orion: add device tree binding Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 05/12] ARM: kirkwood: use devicetree for orion-spi Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 06/12] ARM: kirkwood: use devicetree for SPI on dreamplug Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 07/12] I2C: MV64XXX: Add Device Tree support Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
[not found] ` <1341325365-21393-8-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-03 15:59 ` Florian Fainelli
2012-07-03 15:59 ` Florian Fainelli
2012-07-03 16:58 ` Andrew Lunn
2012-07-03 16:58 ` Andrew Lunn
[not found] ` <20120703165839.GA1519-g2DYL2Zd6BY@public.gmane.org>
2012-07-04 19:49 ` Florian Fainelli
2012-07-04 19:49 ` Florian Fainelli
2012-07-05 6:52 ` Andrew Lunn
2012-07-05 6:52 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 08/12] Kirkwood: Add basic device tree support for QNAP TS219 Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
[not found] ` <1341325365-21393-9-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-03 15:47 ` Florian Fainelli
2012-07-03 15:47 ` Florian Fainelli
2012-07-03 17:09 ` Andrew Lunn
2012-07-03 17:09 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 09/12] ARM: Kirkwood: DTify the watchdog timer Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 10/12] ATA: sata_mv: Add device tree support Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 11/12] ARM: Kirkwood: Use DT to configure SATA device Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
[not found] ` <1341325365-21393-12-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-03 14:52 ` Josh Coombs
2012-07-03 14:52 ` Josh Coombs
[not found] ` <CAMW5Ufa2bsYs9VD2g9hJWKpcQNcZt+WXCA1ohYoHeLk9SambSg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-07-03 15:32 ` Andrew Lunn
2012-07-03 15:32 ` Andrew Lunn
2012-07-03 14:22 ` [PATCH v2 12/12] Crypto: CESA: Add support for DT based instantiation Andrew Lunn
2012-07-03 14:22 ` Andrew Lunn
[not found] ` <1341325365-21393-13-git-send-email-andrew-g2DYL2Zd6BY@public.gmane.org>
2012-07-03 15:50 ` Florian Fainelli
2012-07-03 15:50 ` Florian Fainelli
2012-07-03 17:03 ` Andrew Lunn
2012-07-03 17:03 ` Andrew Lunn
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