Alan, sorry but I'm still having trouble understanding which aspect of
my patch you are objecting to. I think I probably misinterpreted one of
your earlier comments.
My patch included this comment:
There is still a downside to this patch: if the user inserts a VIA
PCI card into a VIA-based motherboard, in some circumstances the
quirk will also run on
the VIA PCI card. This corner case is hard to avoid.
To which you replied:
NAK
This is not a "corner case"
Very large numbers of VIA mainboards ship with some of the VIA devices
built in and some of them on the PCI bus. In fact they generally start
shipped on the board as PCI devices and migrate over time.
and later followed up with:
If they are on the V-Bus then the IRQ number controls routing if they
are on the PCI bus the IRQ line controls routing as normal.
The scenario you are talking about there (internal devices on PCI bus vs
V-bus) is different from the one I was talking about (external VIA-based
PCI cards going into PCI slots on a VIA-based motherboard).
Regardless of that I tried to piece together what I thought you might be
trying to say, in order to understand the NAK:
OK, so per your last mail, most VIA devices start on the PCI bus and
then later are migrated onto the V-bus.
Devices on the PCI bus need to be quirked (in some circumstances), as
when they are on the PCI bus they use the IRQ line for routing, and
the IRQ line is what the quirk actually modifies.
V-bus devices do not need the quirk because IRQ routing there is
handled by IRQ number alone.
Is the above correct?
And then you replied:
I've no idea.
Can you clarify?
Thanks.
Daniel
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