[ubuntu-uk] VIA Neheima CPU and Ubuntu Server

Yorvyk yorvik.ubunto at googlemail.com
Wed May 15 18:52:00 UTC 2013


On 15/05/13 10:41, Liam Proven wrote:
> On 14 May 2013 13:34, J Fernyhough <j.fernyhough at gmail.com> wrote:
>> The C3 doesn't have PAE support [1]. This means the more recent
>> kernels (IIRC quantal and up) won't boot as their config has PAE
>> as a requirement. You'll either need to compile your own, or use a
>> distro that retains support for those older non-PAE chips.
>>
>> Jonathon
>>
>> [1] From
>> http://datasheets.chipdb.org/VIA/Nehemiah/VIA%20C3%20Nehemiah%20Datasheet%20R113.pdf
>>
>>
>>
, page 2-12 (24?):
>>
>> "Physical Address Extensions: PAE This function is omitted since
>> the target market for the VIA C3 Nehemiah processor is portables
>> and typical desktop systems. These systems do not use 2 MB paging
>> and have greater than 4 GB of system memory."
>
> If it *is* /just/ PAE that is the issue, then non-PAE CPUs were
> supported in the mainline distro until 11.10 and could be installed
> with 12.04 using the mini-netboot ISO followed by a manual install of
> the desktop environment:
>
> apt-get install ubuntu-desktop -y apt-get install lubuntu-desktop -y
>  apt-get install xubuntu-desktop -y
>
> ... etc.
>
> N.B. that Lubuntu 12.04 is *not* an LTS release.
>
> However, if the Via C3 has other issues as well as PAE support, this
>  may not be enough.
>
I believe the C3 doesn't have a full i686 instruction set and requires a
i589, or lower, kernel. The geode SOC is similar in this respect.


> If you are running 12.04 successfully and want to /upgrade/ to a
> newer release, you can do this using a small tweak that fakes PAE
> support:
>
> https://launchpad.net/~prof7bit/+archive/fake-pae
>
> I have tested this successfully with Lubuntu 12.10 and 13.04 on an
> IBM Thinkpad X31 with a 1.7GHz Pentium-M CPU, which is more than fast
> enough to run Lubuntu very well but lacks PAE. (It is *considerably*
> quicker than an Atom CPU of equivalent MHz which has PAE.)
>
As I understand it he Pentium M does have PAE but no PAE flag. The
fake-pae patches /proc/cpu so as as to show this flag as it were.



-- 
Steve



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