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Re: [Qemu-ppc] device crash test -- isa-fdc on ppc64/powernv

From: Thomas Huth
Subject: Re: [Qemu-ppc] device crash test -- isa-fdc on ppc64/powernv
Date: Tue, 10 Oct 2017 04:41:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0

On 10.10.2017 04:37, Eduardo Habkost wrote:
> On Tue, Oct 10, 2017 at 04:31:40AM +0200, Thomas Huth wrote:
>> On 09.10.2017 21:50, John Snow wrote:
>>> Hi Thomas, I'm not particularly familiar with the various PPC flavors,
>>> so please forgive me:
>>> Apparently isa-fdc fails to instantiate on powernv (which appears to
>>> have an ISA bus) because through one way or another, we never call:
>>> isa_bus_dma, invoked by
>>> DMA_init, invoked by, seemingly usually,
>>> - i82374_realize in hw/dma/i82374.c
>>> by comparison, the prep board appears to use the i82378 which in turn
>>> uses the 82374 which is how we get our ISA DMA initialization.
>>> pnv doesn't seem to have a DMA device on its ISA bus.
>>> Should the powernv board be initializing something like this, or is it
>>> more correct to just disable the isa-fdc device for this board for now
>>> and be done with it?
>> I don't know the powernv board very well, but maybe Cédric could answer
>> that question.
>> For reference, I assume you're talking about this crash here:
>> qemu-system-ppc64 -M powernv -device isa-fdc
>> qemu-system-ppc64: hw/block/fdc.c:2703: isabus_fdc_realize: Assertion
>> `fdctrl->dma' failed.
>> Aborted (core dumped)
>> ?
>> IIRC Eduardo also posted a patch for that one already, not sure about
>> the current status, though.
> Eduardo Otubo posted a patch for a different case: assertion
> failure inside DMA_init() when another device already called
> DMA_init() (e.g. if two i82374 devices are instantiated).  The
> fix was to make i82374 non-user-creatable.

You mean this one here:



I was rather thinking of this patch here:



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