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SubjectRe: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA
> I think it is a relatively safe assumption that there is only one
> ISA bridge. A lot of old drivers hardcode PIO or memory addresses

It's not a safe assumption for x86 at least. There are a few systems with
multiple ISA busses particularly older laptops with a docking station.

> when talking to an ISA device, so having multiple instances is
> already problematic.

PCMCIA devices handle it themselves so are ok. I'm not clear how the dual
PIIX4 configuration used in the older IBM laptop docks actually worked so
I assume the transaction went out of both bridges and providing one of
them responded the other kept silent as you simply stuffed the card into
the dock and it worked.


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