Re: [CAD_CAM_EDM_DRO] Linux CNC Control program

Doug Pollard wrote:

> Wreno Wynne wrote:
>
>> Michael,
>>
>> Thanks for the explanation. That is kind of what I was planning - or a
>> dedicated CPU - anyway, once I get the hardware up and running.
>>
>> Cheers,
>>
>> Wreno
>>
>> Michael Fagan wrote:
>>
>>> Wreno,
>>> Note that EMC2 runs under a different version of the Ubuntu OS than
>>> would normally be used for typical computing. If you were running it
>>> for motion control, you'd want to add a separate partition with their
>>> version. Notably, their version has several changes to allow
>>> real-time operation where even normal Linux would fail.
>>>
>>>

Actually, you don't need a separate partition. All you'd need is to
load the correct kernel and associated files, and then boot that kernel.
One major headache with this approach is then Ubuntu will constantly be
barraging you with "an update is available" messages, and if you allow
the update to happen, it will replace your kernel.

Once the kernel and kernel symbol table is loaded, you can compile and
link EMC to it. But, then there is no reason to ever need a NON-RT
kernel, or at least I can't think of one. My company web server is
running an EMC2 version of Ubuntu 8.04, with a ton of software on it.


Jon