This looks dubious but with the right results.
> - pmi_base = (unsigned short*)bus_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
> + pmi_base = (unsigned short*)isa_bus_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
The address passed back from the BIOS is a physical address. Not a bus
address, not an ISA address. phys_to_virt I suspect is genuinely the right
thing in this unusual case.
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