[Qemu-devel] GNU/Linux RTAI/ADEOS working on Qemu

[Panagiotis Issaris]

Hi,

Yesterday I somehow accidently surfed to the Qemu homepage and based on
the screenshots -and enthousiasm about ffmpeg/libavcodec- I decided to 
give it a try.

I started with the provided diskimages of FreeDOS, GNU/Linux and NetBSD
and was immediatly impressed by the performance of Qemu. My previous
experience with Bochs was rather good, except for its rather extreme 
slowness.
Furthermore, as I am interested in using such an emulator for testing 
experimental
RTAI code, I was disappointed to discover that RTAI/LXRT did not work at 
all in Bochs.

You can't imagine my great joy when successfully running the RTAI/LXRT 
testsuite  in Qemu!
The tests worked and furthermore, the current tests of our TAO/RTAI port 
worked as well
on Qemu as on a real PC (except timing ofcourse).

After that, I decided to give RTAI's experimental tree a try, which I 
didn't dare do before, because
of potential crashes and damage to my filesystems. And yes, the RTAI 3.1 
CVS testsuite worked
flawlessy on a 2.6.4 Linux kernel.

In my enthousiasm, I tried  some other operating systems afterwards such 
as the QNX demodisk
which ran fine except for the networkcard detection. ReactOS and 
MenuetOS worked, but the rendering
of the graphics was really slow (as I read before on the mailinglist), 
which strongly contrasted with Qemu's non-graphical performance.

I did notice something that appears to be a bug, as initially the RTAI 
testsuite ran perfectly, I left it running
for about an hour after which it started using all CPU and the guest OS 
totally blocked.

So, in conclusion, I am very enthousiastic about and impressed by this 
project and will start try using it for
debugging RTAI kernel/userspace applications. I haven't tried Qemu's 
debugging interfaces yet.

With friendly regards,
Takis

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