Subject: PortIO example does not work on PC with PCI bridge

NTDEV
1

Hi

I need to build custom driver for accessing LPT port under WIN2000.
It works fine on PC where LPT sits on ISA, but there is a problem
when LPT address is mapped to PCI via PCI-ISA bridge.

I build PortIO example from WIN2000 DDK, and it does not work as well,
reading from 0x378 every time returns -1.

I confused, becouse direct access via inb/outb in Win98 works fine on both
PCs.

Thanks for any help in advance.