Re: [coLinux-users] Re: [coLinux-devel] colinux-0.6.2-pre1 crashed on athlon 64

[Nuno L. <lu...@nl...>]

Joe Wells, dando pulos de alegria, escreveu :
> 
> Is this an issue only for AMD CPUs or does it also affect some Intel
> CPUs?
> 
> I've tried to follow this thread on the mailing lists and it is not
> clear to me what conclusion to draw.
> 

To make it clearer, the problem can be triggered with any Pentium
II/III/IV and the old Pentium Pro. And any compatible AMD that
implements the PAE mechanism (Physical Address Extensions).

Windows doesn't enable PAE unless explicitely ordered to (with the /PAE
switch), but in order to use DEP/NX, the processor needs to be run with
PAE enabled (to have 64 bits page tables, instead of 32 bits).

So, on Amd64 processors (and maybe Intel Ithanium, not sure about this),
the bug will be triggered as soon as one enables the SP2 DEP/NX feature,
but because PAE is also enabled.

What is not tested yet is if, after correcting the PAE issue, it will
have problems with the DEP/NX one. But the second should be easy enough
to solve.


Regards,
~Nuno Lucas