Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80I/O delay override.

[Alan Cox]

> The PIT usage for calibrating the delay loop can be moderated, if need 
> by, by using the PC BIOS which by definition uses the PIT correctly it 
> its int 15 function 83 call..   Just do it before coming up in a state 
> where the PC BIOS int 15h calls no longer work.  I gave code to do this 
> in a much earlier message.

And as I've said before we don't know if we have a PC BIOS. If we are
running from a kexec or on a Macintoy with EFI or an Xbox we may not.

As per previous discussions for the PIT we can simply guess a safe
initial udelay value and then tune the real one.

Alan
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