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From: Sebastian Bauer <mail@sebastianbauer.info>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: BALATON Zoltan <balaton@eik.bme.hu>,
	Alexander Graf <agraf@suse.de>, qemu-ppc <qemu-ppc@nongnu.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [PATCH] sam460ex: Fix PCI interrupt connections
Date: Tue, 31 Jul 2018 07:09:43 +0200	[thread overview]
Message-ID: <01ddb520c0355680399999199f4f0e8d@sebastianbauer.info> (raw)
In-Reply-To: <CAFEAcA-tAewpxZZAh5vmB0ZRYGdoLHrBuZ14aW0Qczsp3gQZ7A@mail.gmail.com>

Am 2018-07-31 01:15, schrieb Peter Maydell:
> It would work. But creating an OR gate is half a dozen lines or so of
> code, so it's not much more work than changing the PCI controller.
> So we should prefer whichever is closest to what the real hardware
> does, assuming we can determine that.

The real way is not known. The only source of information is UBoot which 
sets the interrupt line to 32 for all PCI devices. At least AmigaOS 
doesn't overwrite this setting. But UBoot could be wrong of course, as 
the hardware provides only one PCI slot (I think the sm502 is also 
connected to that bus in a direct fashion, but it doesn't have an PCI 
IRQ). Technically, we could also modify UBoot to chose other lines, at 
least AmigaOS would continue to work (if this maps the QEMU wiring) but 
this UBoot would be incompatible to the original hardware.

Bye
Sebastian

      reply	other threads:[~2018-07-31  5:09 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-30  4:39 [Qemu-devel] [PATCH] sam460ex: Fix PCI interrupt connections Sebastian Bauer
2018-07-30  4:49 ` David Gibson
2018-07-30 11:06 ` BALATON Zoltan
2018-07-30 12:04   ` Sebastian Bauer
2018-07-30 22:37     ` BALATON Zoltan
2018-07-30 23:00       ` Peter Maydell
2018-07-30 23:31         ` BALATON Zoltan
2018-07-31  0:18           ` David Gibson
2018-07-31  4:57             ` Sebastian Bauer
2018-07-31  6:06               ` David Gibson
2018-07-31  9:50               ` BALATON Zoltan
2018-07-31 10:32                 ` Sebastian Bauer
2018-07-31 11:24                   ` [Qemu-devel] [Qemu-ppc] " BALATON Zoltan
2018-07-30 22:47   ` [Qemu-devel] " Peter Maydell
2018-07-30 23:00     ` BALATON Zoltan
2018-07-30 23:15       ` Peter Maydell
2018-07-31  5:09         ` Sebastian Bauer [this message]

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