From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 11/12] ARM: mvebu: Relocate Armada 370 PCIe device tree nodes
Date: Wed, 19 Jun 2013 10:53:48 -0600 [thread overview]
Message-ID: <20130619165348.GA32155@obsidianresearch.com> (raw)
In-Reply-To: <201306191411.59010.arnd@arndb.de>
On Wed, Jun 19, 2013 at 02:11:58PM +0200, Arnd Bergmann wrote:
> > Mmm.. and why is this option acceptable?
>
> As I explained on IRC, there is no requirement to pick a specific bus
> aperture. The only two sensible choices are to make the bus address
> the same as the CPU address, or to make the bus address start at 0,
> which is what this does.
PCI bus addresses must not alias other addresess in the system or
you'll get weirdness. For instance DMA initiated from the PCI bus at
address 0, intended to read from SDRAM at 0 must not be claimed by
another device on the PCI bus. IMHO, a 1:1 mapping between PCI and CPU
is strongly preferred. Any other configuration will need some
additional techniques to avoid aliasing.
Jason
next prev parent reply other threads:[~2013-06-19 16:53 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 11:25 [PATCH v3 00/12] MBus device tree binding Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 01/12] bus: mvebu-mbus: Factor out initialization details Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 02/12] bus: mvebu-mbus: Introduce device tree binding Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 03/12] bus: mvebu-mbus: Add static window allocation to the DT binding Ezequiel Garcia
2013-06-18 16:14 ` Arnd Bergmann
2013-06-18 17:12 ` Thomas Petazzoni
2013-06-18 17:16 ` Arnd Bergmann
2013-06-18 21:34 ` Ezequiel Garcia
2013-06-18 21:45 ` Arnd Bergmann
2013-06-19 18:52 ` Ezequiel Garcia
2013-06-19 19:08 ` Arnd Bergmann
2013-06-19 19:29 ` Ezequiel Garcia
2013-06-19 19:37 ` Jason Cooper
2013-06-18 17:46 ` Jason Gunthorpe
2013-06-18 18:24 ` Sebastian Hesselbarth
2013-06-18 18:39 ` Arnd Bergmann
2013-06-18 18:44 ` Sebastian Hesselbarth
2013-06-18 18:47 ` Jason Gunthorpe
2013-06-18 18:59 ` Sebastian Hesselbarth
2013-06-18 19:10 ` Jason Gunthorpe
2013-06-18 19:27 ` Sebastian Hesselbarth
2013-06-18 20:49 ` Ezequiel Garcia
2013-06-18 20:55 ` Jason Gunthorpe
2013-06-18 21:10 ` Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 04/12] ARM: mvebu: Initialize MBus using " Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 05/12] ARM: mvebu: Remove the harcoded BootROM window allocation Ezequiel Garcia
2013-06-18 17:39 ` Jason Gunthorpe
2013-06-18 19:43 ` Ezequiel Garcia
2013-06-18 19:51 ` Jason Gunthorpe
2013-06-18 20:02 ` Ezequiel Garcia
2013-06-18 20:10 ` Jason Gunthorpe
2013-06-18 20:39 ` Ezequiel Garcia
2013-06-19 10:02 ` Ezequiel Garcia
2013-06-19 16:58 ` Jason Gunthorpe
2013-06-19 17:58 ` Ezequiel Garcia
2013-06-19 18:03 ` Jason Gunthorpe
2013-06-19 18:17 ` Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 06/12] memory: mvebu-devbus: Remove address decoding window workaround Ezequiel Garcia
2013-06-18 11:39 ` Jason Cooper
2013-06-18 12:17 ` Thomas Petazzoni
2013-06-18 12:33 ` Jason Cooper
2013-06-18 12:48 ` Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 07/12] ARM: mvebu: Use the preprocessor on Armada 370/XP device tree files Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 08/12] ARM: mvebu: Add MBus to Armada 370/XP device tree Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 09/12] ARM: mvebu: Add BootROM " Ezequiel Garcia
2013-06-18 11:25 ` [PATCH v3 10/12] ARM: mvebu: Relocate Armada 370/XP DeviceBus device tree nodes Ezequiel Garcia
2013-06-18 16:16 ` Arnd Bergmann
2013-06-18 22:09 ` Ezequiel Garcia
2013-06-18 22:14 ` Ezequiel Garcia
2013-06-19 12:03 ` Arnd Bergmann
2013-06-18 11:25 ` [PATCH v3 11/12] ARM: mvebu: Relocate Armada 370 PCIe " Ezequiel Garcia
2013-06-18 16:29 ` Arnd Bergmann
2013-06-18 17:15 ` Thomas Petazzoni
2013-06-18 17:18 ` Arnd Bergmann
2013-06-18 17:21 ` Thomas Petazzoni
2013-06-18 18:22 ` Arnd Bergmann
2013-06-18 19:02 ` Jason Gunthorpe
2013-06-18 21:20 ` Arnd Bergmann
2013-06-18 21:40 ` Ezequiel Garcia
2013-06-19 12:06 ` Arnd Bergmann
2013-06-18 21:35 ` Arnd Bergmann
2013-06-19 11:12 ` Ezequiel Garcia
2013-06-19 12:11 ` Arnd Bergmann
2013-06-19 16:53 ` Jason Gunthorpe [this message]
2013-06-19 18:55 ` Arnd Bergmann
2013-06-18 11:25 ` [PATCH v3 12/12] ARM: mvebu: Relocate Armada XP " Ezequiel Garcia
2013-06-18 11:33 ` [PATCH v3 00/12] MBus device tree binding Sebastian Hesselbarth
2013-06-18 13:07 ` Ezequiel Garcia
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