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Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA

From One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Newsgroups linux.kernel
Subject Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA
Date 2016-11-09 15:00 +0100
Message-ID <sBBA2-7ZN-3@gated-at.bofh.it> (permalink)
References <sB5gJ-3TL-9@gated-at.bofh.it> <sB5gJ-3TL-7@gated-at.bofh.it> <sBdei-pw-15@gated-at.bofh.it> <sBhrA-3gP-35@gated-at.bofh.it>
Organization Intel Corporation

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> 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

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Thread

[PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA "zhichang.yuan" <yuanzhichang@hisilicon.com> - 2016-11-08 04:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA kbuild test robot <lkp@intel.com> - 2016-11-08 06:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA kbuild test robot <lkp@intel.com> - 2016-11-08 06:30 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-08 13:00 +0100
    Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA Arnd Bergmann <arnd@arndb.de> - 2016-11-08 17:30 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-08 18:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-09 15:00 +0100
        RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-09 16:00 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA Arnd Bergmann <arnd@arndb.de> - 2016-11-09 22:40 +0100
    Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2016-11-09 00:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Mark Rutland <mark.rutland@arm.com> - 2016-11-09 12:30 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2016-11-10 08:20 +0100
  Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA liviu.dudau@arm.com - 2016-11-09 12:50 +0100
    RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-09 17:20 +0100
      Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA "liviu.dudau@arm.com" <liviu.dudau@arm.com> - 2016-11-09 18:00 +0100
        Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special  ISA "zhichang.yuan" <yuanzhichang@hisilicon.com> - 2016-11-10 07:30 +0100
        RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA Gabriele Paoloni <gabriele.paoloni@huawei.com> - 2016-11-10 17:10 +0100
          Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for  special ISA "liviu.dudau@arm.com" <liviu.dudau@arm.com> - 2016-11-11 11:40 +0100

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