Re: [Qemu-devel] [PATCH] pci: fix bridge IO/BASE

[Blue Swirl]

On Sun, Mar 4, 2012 at 12:41, Avi Kivity <address@hidden> wrote:
> On 03/04/2012 02:38 PM, Blue Swirl wrote:
>> >>
>> >> This unassigned memory exception is triggered because CMD646 IDE I/O
>> >> registers are not accessible:
>> >>
>> >> (qemu) info pci
>> >>   Bus  0, device   5, function 0:
>> >>     IDE controller: PCI device 1095:0646
>> >>       IRQ 1.
>> >>       BAR0: I/O at 0xffffffffffffffff [0x0006].
>> >>       BAR1: I/O at 0xffffffffffffffff [0x0002].
>> >>       BAR2: I/O at 0xffffffffffffffff [0x0006].
>> >>       BAR3: I/O at 0xffffffffffffffff [0x0002].
>> >>       BAR4: I/O at 0xffffffffffffffff [0x000e].
>> >>       id ""
>> >
>> > The BARs are not initialized, so they aren't accessible.
>> >
>> > But perhaps the dump was not taken at the point of failure, can you
>> > provide a relevant dump if so?
>>
>> No, this is after failure.
>
> I don't see why the guest expects the BARs to work then.

OpenBIOS could initialize them before this commit, now it obviously
can't (or initializes the bridges incorrectly).

Maybe also the devices should be moved behind the bridges, that's
where they really should be.

>
> --
> error compiling committee.c: too many arguments to function
>