4gb address space limitation for i386

[Jeff Mohler]

Youre pretty much going to require an AMD setup for that.

On 8/30/07, User Bobby <bobby at susanne.tomatoseed.org> wrote:
>
> I have an IBM xSeries 350 4xPIII with 5.5gb of RAM, and see that only
> about 3.5gb is being used under the i386 port.  I've been looking through
> the
> archives to try and figure out what the root of the problem is and I amn't
> quite sure I know which part of the situation is the real problem.
>
> Is it a limitation of the i386 port?  That is to say, if there were a
> specific PIII (i686?) port, would this problem be overcome?  Or is it a
> hardware limitation?  Is it necessary to use a not-clean method to
> access the extra address space (is this what PAE is?), and there's no
> clean
> way around it, regardless of the port?
>
> I was looking at building a PAE kernel, but was discouraged by the lack of
> usb and certain SCSI support, both of which I'd really like to have (in
> the case of SCSI, need to have).  Is this lack of support because of an
> inherent difficulty in the hardware, or could it be overcome in a
> stable way with modification of the device driver code?
>
> My basic (and very hypothetical) question - if I had unlimited time and
> knowledge (I have limited both), what direction would I take to get access
> to all 5.5gb of RAM on this particular computer?
>
> Thank you,
> Bob
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