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

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> -----Original Message-----
> From: One Thousand Gnomes [mailto:gnomes@lxorguk.ukuu.org.uk]
> Sent: 09 November 2016 13:55
> To: Arnd Bergmann
> Cc: Mark Rutland; Yuanzhichang; 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;
> 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; Gabriele
> Paoloni; zhichang.yuan02@gmail.com; kantyzc@163.com; xuwei (O);
> marc.zyngier@arm.com
> Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for
> special ISA
> 
> > 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.

Mmmm right...now the point is that this kind of special devices appearing
as a special ISA bus will probably never appear on x86 platforms (I guess).

So maybe it is a safe assumption because of this...?

Thanks

Gab

> 
> > 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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[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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