[coreboot-gerrit] Change in coreboot[master]: device/pci: Ensure full 16-bit VGA port i/o decoding

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/35516 )

Change subject: device/pci: Ensure full 16-bit VGA port i/o decoding
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Patch Set 1: Code-Review-1

Dug a little into the chipset support for historical Intel
in the tree: Older ICHs implement the bit r/w but mention
to ignore it anyway, because everything goes to PCI. So that
should be fine.

440BX doesn't seem to know it, though :-/ So this can't go
in as is. I'm open for suggestions. What should we do if
16-bit decode isn't possible? Restrict all i/o to 10 bits?
That could brick... Hmmmm, just warn about it? Instead of
skipping the device?

I really don't like to reserve the VGA resources 64 times,
could do that, though.