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Re: [Qemu-ppc] [Qemu-devel] [PATCH 2/2] m48t59: add mem_base value to m4

From: Peter Maydell
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 2/2] m48t59: add mem_base value to m48t59_init_isa()
Date: Mon, 19 Jan 2015 15:04:38 +0000

On 19 January 2015 at 12:57, Artyom Tarasenko <address@hidden> wrote:
> But out of curiosity, would it be possible to have a sysbus device
> somewhere in a middle of PCI space? Do sysbus devices have higher
> priority if the address spaces overlap? Or do you mean that the PCI
> controller needs to be modified to have a hole for a sysbus device?

You can specify the priority when you map devices into a MemoryRegion,
so you can handle this by either making the sysbus device a positive
priority or by making the PCI window have a negative priority.

(We don't actually get this right on x86 currently,
which has resulted in some awkwardness for the PPC desire to
make PCI address 0 valid.)

-- PMM

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