Kevin Hilman wrote:
Do you have the DVEVM or the DVSDK? Both are based on the MontaVista
Professional edition kernel, which is a 2.6.10-based kernel, plus lots
of patches, architectures and features as well as backported features
from newer kernels. The DVEVM has an early-release of the MV kernel,
and the DVSDK has the official, supported product.
We have the DVEVM. It sounds like we ought to consider getting the DVSDK.
The reason I'm asking ...
We really need to get the real time patches which have been applied to
the main line since 2.6.10. The current kernel has them built in I believe.
Which real-time patches are you speaking of?
Actually, the real-time patches are still not part of mainline. Several
sub-features of the -rt patch are in mainline (generic time-keeping,
hrtimers, dynamic tick, etc.) but the core realtime preemption feature
is still a separate patch maintained by Ingo Molnar[1].
Thanks for that - I had the impression that most of the real-time
patches were in the main line. Once we move to 2.6.20 I suppose it would
be fairly easy to apply the real time patches for preemption.
The realtime work for ARM is not integrated an any one place yet either.
I have submitted patches to the ARM kernel for all the core
functionality that is in mainline, but there would still be work to do
for validating this on DaVinci for 2.6.20+
In other words, if you need working -rt support for the latest kernels,
I can point you to the pieces you need, but you would still have a
decent amount of integration and validation work to do for DaVinci.
Also note that some of the TI-specific software, particularily DSPLink,
is known not to work using full real-time preemption. So there is not
only just kernel work to do.
Do you know any more about the DSPLink problem with full real-time
preemption ? Does it just need a rebuild or is it more serious than that?
The git tree is the work-in-progress of forward porting the 2.6.10
kernel to the latest kernel. These drivers were not intentionally left
out, they just have not yet been forward ported. Most of this work has
been done by MontaVista, but contributors are welcome! Since you have
he source for 2.6.10, feel free to do the port and contribute.
Remember that the git tree is an open-source project. It is only as
good as its contributions (and contributors.) It is not a TI or
MontaVista "supported" product, although both companies contribute.
Hope that helps,
Kevin
Thanks Kevin, that does help
Paul
[1] http://people.redhat.com/mingo/realtime-preempt/
[2] RMK's patch system:
http://www.arm.linux.org.uk/developer/patches/section.php
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