Re: Southbridges and interrupts

From	Dave Yeo <dave.r.yeo@gmail.com>
Newsgroups	comp.os.os2.apps, comp.os.os2.setup.misc, comp.sys.ibm.pc.hardware.chips
Subject	Re: Southbridges and interrupts
Date	2011-08-12 19:28 -0700
Organization	Aioe.org NNTP Server
Message-ID	<j24ngf$319$1@speranza.aioe.org> (permalink)
References	(6 earlier) <IU.D20110810.T145204.P15182.Q0@J.de.Boyne.Pollard.localhost> <j20qfh$t0h$1@speranza.aioe.org> <IU.D20110811.T173020.P16364.Q0@J.de.Boyne.Pollard.localhost> <j21r1c$ah8$1@speranza.aioe.org> <IU.D20110812.T054838.P16927.Q0@J.de.Boyne.Pollard.localhost>

Cross-posted to 3 groups.

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Jonathan de Boyne Pollard wrote:
>>> That's unusual. What chipset does it have?
>>>
>> Northbridge: Intel® 865G
>>
>> Southbridge: Intel® ICH5
>>
> Was it you who had me looking at the ICH7? The ICH7 is a little more
> versatile, but also a little more restricted in its "mobile" flavour, in
> that it only supports four PCI interrupt signals internally rather than
> eight.

Yes, I had a ICH7 based computer that unfortunately died


>
>> One PCI slot is shared with the on board audio on #B, The USB 2
>> controller and on board LAN share int #H. Nothing uses #E and no
>> mention is made of the on board Pata, Sata or what I guess are
>> connected to the ISA bus, mouse, keyboard, serial and parallel.
>>
>
> Your mainboard manual is misleading you somewhat. These aren't actual
> PCI slots on your motherboard. All of these are internal devices that
> exist on the ICH chip itself, at fixed PCI addresses.

Well, it claims to have 3 PCI buses, so perhaps slots 1 and 2 are 
physically tied to #F and #G. The point of the manual was that only in 
slot 3 did you have to worry about sharing interrupts.

>
> What your mainboard manual should be telling you is how the PIRQ A, B,
> C, and D signals from the actual PCI slots on the mainboard are wired up
> to the PIRQ A, B, C, and D inputs to the ICH5 chip. This is
> mainboard-specific. The idea is that every card uses the PIRQ A signal
> for preference, and that a wiring matrix on the mainboard distributes
> everyone's PIRQ A amongst PIRQs A, B, C, and D by the time that the
> signal reaches the ICH chip. Mainboard manufacturers are free to choose
> the matrix, and must lay out a table, the so-called "$PIR" table, in
> firmware memory that describes it to software (so that software knows
> what PCI interrupt a card that reports "I'm using PIRQ A!" is actually
> using). The signals after they have been processed through the wiring
> matrix are what the ICH5 treats as PIRQ A, B, C, and D, to which it adds
> E, F, G, and H.

The one PCI card I have installed is reported by pci.exe to use PCI 
bus#2, IRQ#3, INT#A
[...]
Dave

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Re: doscall1 Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-10 15:51 +0100
  Re: doscall1 "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-10 18:51 +0000
    Re: doscall1 "Lars Erdmann" <lars.erdmann@arcor.de> - 2011-08-11 08:47 +0200
      Re: doscall1 "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-17 21:38 +0000
    Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-12 12:51 +0100
    Re: OS2APIC.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-12 14:02 +0100
      Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-17 21:35 +0000
        Re: OS2APIC.PSD Peter Brown <losepeteSPAM-ME-NOT@ntlworld.com> - 2011-08-18 01:10 +0100
          Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-18 01:04 +0000
            Re: OS2APIC.PSD "Lars Erdmann" <lars.erdmann@arcor.de> - 2011-08-18 11:07 +0200
              Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-19 02:26 +0000
              Re: OS2APIC.PSD "Rich Walsh" <spamyourself@127.0.0.1> - 2011-08-19 04:10 +0000
          Re: OS2APIC.PSD "Lars Erdmann" <lars.erdmann@arcor.de> - 2011-08-18 11:05 +0200
            Re: OS2APIC.PSD Peter Brown <losepeteSPAM-ME-NOT@ntlworld.com> - 2011-08-19 14:49 +0100
              Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-20 03:18 +0000
                Re: OS2APIC.PSD Peter Brown <losepeteSPAM-ME-NOT@ntlworld.com> - 2011-08-20 15:05 +0100
                Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-20 17:49 +0000
              Re: ACPI.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-22 11:16 +0100
            Re: OS2APIC.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-22 11:06 +0100
        Re: OS2APIC.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-19 12:24 +0100
          Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-19 20:48 +0000
            Re: OS2APIC.PSD Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-19 18:09 -0700
              Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-20 03:14 +0000
            Re: OS2APIC.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-21 13:27 +0100
          Re: OS2APIC.PSD "Lars Erdmann" <lars.erdmann@arcor.de> - 2011-09-05 18:59 +0200
    Re: doscall1 "Trevor Hemsley" <Trevor.Hemsley@mytrousers.ntlworld.com> - 2011-08-12 13:57 -0500
      Re: os2apic Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-15 16:17 +0100
    Re: OS2APIC.PSD Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-15 16:34 +0100
      Re: OS2APIC.PSD "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net> - 2011-08-17 21:32 +0000
  Re: doscall1 Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-11 07:54 -0700
    Re: doscall1 Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-11 18:29 +0100
      Re: doscall1 Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-11 17:10 -0700
        Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-12 06:47 +0100
          Re: Southbridges and interrupts Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-12 19:28 -0700
            Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-15 18:07 +0100
              Re: Southbridges and interrupts Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-15 17:38 -0700
                Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-16 16:58 +0100
                Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-16 17:24 +0100
                Re: Southbridges and interrupts Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-16 18:39 -0700
                Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-17 10:36 +0100
          Re: Southbridges and interrupts Dave Yeo <dave.r.yeo@gmail.com> - 2011-08-12 19:52 -0700
            Re: Southbridges and interrupts Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-08-15 17:10 +0100

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