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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: Mon, 14 Nov 2016 11:11:11 +0000	[thread overview]
Message-ID: <20161114111111.1b753dc3@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <5900275.i4NZvtxTcC@wuerfel>

> > 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.  
> 
> But do they have multiple ISA domains? There is no real harm in supporting
> it, the (small) downsides I can think of are:

I don't believe they x86 class ones have multiple ISA domains. But as
I've said I don't know how the electronics in the older ThinkPad worked
when it used two PIIX4s with some LPC or ISA stuff on each.

It works in DOS and unmodified Linux so I'm pretty sure there are no
additional domains. Likewise the various x86 schemes that route some bits
of ISA bus off into strange places work in DOS and don't have any
overlaps.

yenta_socket handles PCI/PCMCIA bridging and routes a range of that flat
ISA space appropriately to the card.

Alan

  reply	other threads:[~2016-11-14 11:12 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
2016-11-09 14:51         ` Gabriele Paoloni
2016-11-09 21:38         ` Arnd Bergmann
2016-11-14 11:11           ` One Thousand Gnomes [this message]
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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