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From: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"zhichang.yuan" <yuanzhichang@hisilicon.com>,
	catalin.marinas@arm.com, will.deacon@arm.com, robh+dt@kernel.org,
	bhelgaas@google.com, olof@lixom.net,
	linux-arm-kernel@lists.infradead.org, lorenzo.pieralisi@arm.com,
	linux-kernel@vger.kernel.org, linuxarm@huawei.com,
	devicetree@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-serial@vger.kernel.org, minyard@acm.org,
	benh@kernel.crashing.org, liviu.dudau@arm.com,
	zourongrong@gmail.com, john.garry@huawei.com,
	gabriele.paoloni@huawei.com, zhichang.yuan02@gmail.com,
	kantyzc@163.com, xuwei5@hisilicon.com, marc.zyngier@arm.com
Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA
Date: Wed, 9 Nov 2016 13:54:53 +0000	[thread overview]
Message-ID: <20161109135453.2e5402bd@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <2368890.jTbyGqYR0M@wuerfel>

> I think it is a relatively safe assumption that there is only one
> ISA bridge. A lot of old drivers hardcode PIO or memory addresses

It's not a safe assumption for x86 at least. There are a few systems with
multiple ISA busses particularly older laptops with a docking station.

> when talking to an ISA device, so having multiple instances is
> already problematic.

PCMCIA devices handle it themselves so are ok. I'm not clear how the dual
PIIX4 configuration used in the older IBM laptop docks actually worked so
I assume the transaction went out of both bridges and providing one of
them responded the other kept silent as you simply stuffed the card into
the dock and it worked.

Alan

  parent reply	other threads:[~2016-11-09 13:56 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-08  3:47 [PATCH V5 0/3] ARM64 LPC: legacy ISA I/O support zhichang.yuan
2016-11-08  3:47 ` [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced zhichang.yuan
2016-11-08 12:03   ` Mark Rutland
2016-11-08 16:09     ` Arnd Bergmann
2016-11-08 16:15       ` Arnd Bergmann
2016-11-08 23:16     ` Benjamin Herrenschmidt
2016-11-10  8:33       ` zhichang.yuan
2016-11-10 11:22       ` Mark Rutland
2016-11-10 19:32         ` Benjamin Herrenschmidt
2016-11-11 10:07           ` zhichang.yuan
2016-11-18  9:20             ` Arnd Bergmann
2016-11-18 11:12               ` zhichang.yuan
2016-11-18 11:38                 ` Arnd Bergmann
2016-11-21 12:58       ` John Garry
2016-11-08 16:12   ` Will Deacon
2016-11-08 16:33     ` John Garry
2016-11-08 16:49       ` Will Deacon
2016-11-08 17:05         ` John Garry
2016-11-08 22:35         ` Arnd Bergmann
2016-11-09 11:29           ` John Garry
2016-11-09 21:33             ` Arnd Bergmann
2016-12-22  8:15   ` Ming Lei
2016-12-23  1:43     ` zhichang.yuan
2016-12-23  7:24       ` Ming Lei
2017-01-06 11:43     ` Arnd Bergmann
2016-11-08  3:47 ` [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA zhichang.yuan
2016-11-08  5:17   ` kbuild test robot
2016-11-08  5:27   ` kbuild test robot
2016-11-08 11:49   ` Mark Rutland
2016-11-08 16:19     ` Arnd Bergmann
2016-11-08 17:10       ` Mark Rutland
2016-11-09 13:54       ` One Thousand Gnomes [this message]
2016-11-09 14:51         ` Gabriele Paoloni
2016-11-09 21:38         ` Arnd Bergmann
2016-11-14 11:11           ` One Thousand Gnomes
2016-11-18  9:22             ` Arnd Bergmann
2016-11-08 23:12     ` Benjamin Herrenschmidt
2016-11-09 11:20       ` Mark Rutland
2016-11-10  7:08         ` Benjamin Herrenschmidt
2016-11-09 11:39   ` liviu.dudau
2016-11-09 16:16     ` Gabriele Paoloni
2016-11-09 16:50       ` liviu.dudau
2016-11-10  6:24         ` zhichang.yuan
2016-11-10 16:06         ` Gabriele Paoloni
2016-11-11 10:37           ` liviu.dudau
2016-11-08  3:47 ` [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06 zhichang.yuan
2016-11-08  6:11   ` kbuild test robot
2016-11-08 16:24   ` Arnd Bergmann
2016-11-09 12:10     ` Gabriele Paoloni
2016-11-09 21:34       ` Arnd Bergmann
2016-11-10  6:40         ` zhichang.yuan
2016-11-10  9:12           ` Arnd Bergmann
2016-11-10 12:36             ` zhichang.yuan
2016-11-18 11:46               ` Arnd Bergmann
2016-11-10 15:36             ` Gabriele Paoloni
2016-11-10 16:07               ` Arnd Bergmann
2016-11-11 10:09                 ` zhichang.yuan
2016-11-11 10:48                 ` liviu.dudau
2016-11-11 13:39                 ` Gabriele Paoloni
2016-11-11 14:45                   ` liviu.dudau
2016-11-11 15:53                     ` Gabriele Paoloni
2016-11-11 18:16                       ` liviu.dudau
2016-11-14  8:26                         ` Gabriele Paoloni
2016-11-14 11:26                           ` liviu.dudau
2016-11-18 10:17                             ` Arnd Bergmann
2016-11-18 12:07                               ` Gabriele Paoloni
2016-11-18 12:24                                 ` Arnd Bergmann
2016-11-18 12:53                                   ` Gabriele Paoloni
2016-11-18 13:42                                     ` Arnd Bergmann
2016-11-18 16:18                                       ` Gabriele Paoloni
2016-11-18 16:34                                         ` Arnd Bergmann
2016-11-18 17:03                                           ` Gabriele Paoloni
2016-11-23 14:16                                             ` Arnd Bergmann
2016-11-23 15:22                                               ` Gabriele Paoloni
2016-11-23 17:07                                                 ` Arnd Bergmann
2016-11-23 23:23                                                   ` Arnd Bergmann
2016-11-24  9:12                                                     ` zhichang.yuan
2016-11-24 10:24                                                       ` Arnd Bergmann
2016-11-25  8:46                                                     ` Gabriele Paoloni
2016-11-25 12:03                                                       ` Arnd Bergmann
2016-11-25 16:27                                                         ` Gabriele Paoloni
2016-11-11 16:54                     ` zhichang.yuan
2016-11-14 11:06         ` One Thousand Gnomes

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