From: Blue Swirl <blauwirbel@gmail.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 8/9] isa: refine irq reservations
Date: Mon, 14 Sep 2009 19:55:23 +0300 [thread overview]
Message-ID: <f43fc5580909140955t4f914f26n5c7f7a247b9b6e64@mail.gmail.com> (raw)
In-Reply-To: <1252943364-32705-9-git-send-email-kraxel@redhat.com>
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On Mon, Sep 14, 2009 at 6:49 PM, Gerd Hoffmann <kraxel@redhat.com> wrote:
> There are a few cases where IRQ sharing on the ISA bus is used and
> possible. In general only devices of the same kind can do that.
> A few use cases:
>
> * serial lines 1+3 share irq 4
> * serial lines 2+4 share irq 3
> * parallel ports share irq 7
> * ppc/prep: ide ports share irq 13
There is another ppc/prep case where RTC and m48t59 share irq 8. The
attached patch converts m48t59 to ISA and makes this more visible.
Does sharing of IRQs really have to be fatal? Wasn't ISA bus edge
triggered and so IRQ sharing was a bit unreliable (but not completely
broken) also on real HW?
[-- Attachment #2: 0001-PPC-use-ISA-version-of-m48t59-for-PREP-machine.patch --]
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next prev parent reply other threads:[~2009-09-14 16:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-14 15:49 [Qemu-devel] [PATCH 0/9] ide: convert to qdev Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 1/9] qdev/pci: add pci_create_noinit() Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 2/9] support media=cdrom for if=none Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 3/9] split away drive init from ide_init2() Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 4/9] ide/qdev: add ide bus Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 5/9] ide/pci: fix indention Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 6/9] ide/pci: convert to qdev Gerd Hoffmann
2009-09-14 15:49 ` [Qemu-devel] [PATCH 7/9] ide/isa: " Gerd Hoffmann
2009-09-14 17:23 ` Blue Swirl
2009-09-14 17:46 ` Blue Swirl
2009-09-15 9:33 ` Gerd Hoffmann
2009-09-15 20:10 ` Blue Swirl
2009-09-14 15:49 ` [Qemu-devel] [PATCH 8/9] isa: refine irq reservations Gerd Hoffmann
2009-09-14 16:55 ` Blue Swirl [this message]
2009-09-14 20:09 ` Markus Armbruster
2009-09-15 7:23 ` Gerd Hoffmann
2009-09-15 19:08 ` Blue Swirl
2009-09-14 15:49 ` [Qemu-devel] [PATCH 9/9] unbreak ppc/prep Gerd Hoffmann
2009-09-23 19:00 ` [Qemu-devel] [PATCH 0/9] ide: convert to qdev Markus Armbruster
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