IEEE 1284 parallel port no go

[garlick]

We tested a couple of IEEE 1284 parallel port PCIe cards and failed. Details at worlickwerx/pi-parport#50.

It seems that this type of card only offers an IO mapped PCIe BAR and the Broadcom PCI bridge doesn't support those.
(Perhaps in retrospect that's a big DUH! but thought it might be worth documenting somewhere for others)

[geerlingguy]

@garlick - Thanks for posting! Yeah, the IO BAR does not work at all on the Pi, so any card/drivers that depend on that working will not work on the Pi :(

I will try to get this added to the site soon!