Thread (16 messages) 16 messages, 6 authors, 2018-10-23

Not-so-old machines without PAE was Re: 32-bit PTI with THP = userspace corruption

From: Pavel Machek <hidden>
Date: 2018-10-23 09:11:33
Also in: lkml

On Mon 2018-10-22 19:48:17, Alan Cox wrote:
On Mon, 22 Oct 2018 09:56:42 +0200
Joerg Roedel [off-list ref] wrote:
quoted
On Sun, Oct 21, 2018 at 02:37:45PM +0200, Pavel Machek wrote:
quoted
On Tue 2018-09-18 14:00:30, Alan Cox wrote:  
quoted
There are pretty much no machines that don't support PAE and are still
even vaguely able to boot a modern Linux kernel. The oddity is the
Pentium-M but most distros shipped a hack to use PAE on the Pentium M
anyway as it seems to work fine.  
I do have some AMD Geode here, in form of subnotebook. Definitely
newer then Pentium Ms, but no PAE...  
Are the AMD Geode chips affected by Meltdown?
Geode for AMD was just a marketing name.

The AMD athlon labelled as 'Geode' will behave like any other Athlon but
I've not seen anyone successfully implement Meltdown on the Athlon so it's
probably ok. 

The earlier NatSemi ones are not AFAIK vulnerable to either. The later
ones might do Spectre (they have branch prediction which is disabled on
the earlier ones) but quite possibly not enough to be attacked usefully -
and you can turn it off anyway if you care.

And I doubt your subnotebook can usefully run modern Linux since the
memory limit on most Geode was about 64MB.
Well, let me see. The machine is not too useful because of dead
battery, but I don't believe RAM would be a problem. It has 512MB or
more, IIRC. Missing PAE is, and missing instructions are. And horrible
keyboard and bad driver support from Linux. And... Ouch and fact that
I use its power supply to power something else.

It looks similar to this:
https://hexus.net/tech/news/laptop/13994-kohjinsha-launches-impressive-subnotebook-twist/
(but has no touchscreen).

Bios is "built 03/02/2007".

CPU is "AuthenticAMD" family 5 model 10, "Geode(TM) Integrated Processor
by AMD PCS". 500 MHz, flags "fpu de pse tsc msr cx8 sep pge cmov
clflush mmx mmxext 3dnowext 3dnow". 512MB RAM.

This is not a suitable compile server, but still could work as a
subnotebook given right software...


									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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