Re: Regression: boot failure on AMD Elan TS-5500

[H. Peter Anvin]

Sean Young wrote:
> On Mon, Jun 30, 2008 at 03:42:47PM -0700, H. Peter Anvin wrote:
> > Jeremy Fitzhardinge wrote:
> > > Maybe it really does require the far jump immediately after setting PE 
> > > in cr0...
> > >
> > > Hm, I don't remember this paragraph being in vol 3a, section 8.9.1 
> > > before.  Is it a recent addition?
> > >
> > >   Random failures can occur if other instructions exist between steps
> > >   3 and 4 above.  Failures will be readily seen in some situations,
> > >   such as when instructions that reference memory are inserted between
> > >   steps 3 and 4 while in system management mode.
> > I don't remember that, either.
>
> Which document are we talking about? 

Intel's Software Developer's Manual, volume 3a.

> I'm afraid it doesn't work. Maybe I can find something in the AMD Elan
> documentation. Would a fence make sense?

Not really.  In particular, I really don't want to add something that is 
even remotely likely to break on other platforms, and a fence 
instruction is relatively recent.

	-hpa
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