NX-bit not enabled on even though CPU supports it (FC4)
Dave Jones
davej at redhat.com
Wed Apr 19 20:19:18 UTC 2006
On Wed, Apr 19, 2006 at 07:43:15PM +0200, Ingemar Nilsson wrote:
> I have a laptop with an Intel Pentium M 760 (Dothan family) processor, but
> even though the Intel CPU comparison chart on their website says that my
> CPU supports the NX bit, I get the following message in dmesg:
>
> dmesg | grep -i nx
> Using x86 segment limits to approximate NX protection
>
> This message was mentioned in an earlier thread as meaning that NX bit
> emulation is turned on since the CPU lacks NX bit support. By the way, 'nx'
> is also listed as a flag when I do
>
> cat /proc/cpuinfo
>
> Any ideas?
>
> My system is FC4 with the latest kernel (2.6.16-1.2069_FC4).
NX needs physical address extensions (PAE) enabled.
The only FC5 kernel that does this is the -smp kernel.
Dave
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