[PATCH 0/1] [Jaunty] LP#74179 -- support for i386 machines with >3GB RAM

Ante Karamatic ivoks at grad.hr
Tue Jan 27 16:09:05 UTC 2009

On Tue, 27 Jan 2009 16:02:27 +0000
Scott James Remnant <scott at canonical.com> wrote:

> Which CPUs, specifically?

Wikipedia [http://en.wikipedia.org/wiki/Physical_Address_Extension]:

PAE is provided by Intel Pentium Pro and above CPUs (including all
later Pentium-series processors except the 400 MHz bus versions of the
Pentium M), as well as by some compatible processors such as the Athlon
and later models from AMD.

IIRC, there were problems with virtualized hardware too in VirtualBox.

> Do they not boot, or just not address areas of memory?

They don't boot at all and PAE isn't something you can enable/disable
on fly, unfortunately :/

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