Hi folks,
I'm trying to get a PC/104 card running on a MediaGX SBC. It's a simple
LCD controller from Parvus that has registers for LCD data and control.
I have a user space program using ioperm() and outb() for accessing the
registers. When I perform a single outb(), I see 3 IOW cycles on the
bus. The first latches data correctly into the register, but then the
second comes along and clears it. My question is this. How is the OUTB
instruction handled by the CPU. Does this go through the BIOS somehow?
Shouldn't I see exactly what's in the disassembly listing? I realize the
OS may do other things behind the scenes to other IO spaces, but doesn't
make sense that it would mess with my LCD space. Any guidance is greatly
appreciated.
scratching my... uhhh.. head, Kyle.
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