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SubjectRe: PATA_ARTOP reads byte from PCI IO port without mapping it to the right address.
> unsigned long io = pci_resource_start(pdev, 4);           // This 
> returns 0x1400 on my machine

That is the PCI port address.

> u8 reg;
>
> ppi[0] = &info_628x;
> if (inb(io) & 0x10)
> // This reads from 0x1400, which isn't were the port actually
> is in the processors address

This reads from I/O port 0x1400 - your inb logic and I/O port mapping on
the platform is responsible for making that work.





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