Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

Dr. David Alan Gilbert
2007-12-09T13:42:20Z

* Pavel Machek (pavel@ucw.cz) wrote:
> Hi!

> Actually, I've seen few pci cards with leds on port 0x80, and I
> wonder: is our outb_p really correct?
>
> I mean, we expect 8usec delay -- historical ISA timing -- but when
> _PCI_ card with leds is inserted, it is likely to be faster than old
> ISA, right?

In the opposite direction I'm sure I've heard of things that port 80
information down i2c - could this be slower?

Dave
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