Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Fri, 14 Dec 2007 14:13:46 -0800
"H. Peter Anvin" <hpa@zytor.com> wrote:

> Pavel Machek wrote:
> > On Fri 2007-12-14 10:02:57, H. Peter Anvin wrote:
> >> Ingo Molnar wrote:
> >>> wow, cool fix! (I remember that there were other systems as well that are 
> >>> affected by port 0x80 muckery - i thought we had removed port 0x80 
> >>> accesses long ago.)
> >>> how about the simpler fix below, as a first-level approach? We can then 
> >>> remove the _p in/out sequences after this.
> >> I believe this will suffer from the issue that was raised: this will use 
> >> udelay() long before loop calibration (and no, we can't just "be 
> >> conservative" since there is no "conservative" value we can use.)
> > 
> > ?? Just initialize bogomips to 6GHz equivalent... and we are fine
> > until 6GHz cpus come out.
> 
> How long will that take to boot on a 386?

Well the dumb approach to fix that would seem to be to initialise it to

	cpu->family   3 -> 50MHz 4 -> 300Mhz 5-> etc...

Alan
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