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Re: [Qemu-devel] [PATCH v2 07/11] versatile_pci: Implement the correct P


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2 07/11] versatile_pci: Implement the correct PCI IRQ mapping
Date: Tue, 26 Mar 2013 11:00:13 +0000

On 26 March 2013 10:54, Arnd Bergmann <address@hidden> wrote:
> Yes, very good.  We will probably introduce sparse irq support on
> versatile in the near future, and then the value we write into the
> PCI_INTERRUPT_LINE field will become arbitrary from qemu's point
> of view, but I will make sure that we fix the interrupt mapping
> in the kernel at the same time so we always fall into the
> "s->broken_irq_mapping = false;" case.

Yeah, as long as you avoid the number 27 you're ok :-)

> We also need to find a way to make the new kernel work with
> an old qemu, and I think we can do that by using the versatile-dt
> board type with a PCI device node that sets all four lines to
> 27, while using the actual interrupt lines for the default
> versatile device tree.

Personally I'd be happy for you to just say "needs a new QEMU".
The broken QEMU is missing so much (including working memory
windows) that I think it would be a pain to get the kernel to
cope with it.

-- PMM



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