RT-Preempt Kernel

I hope this is the right place to post this.

Has anyone made any progress building a kernel with Ingo Molnar's RT-Preempt patch applied? I've seen others have had success with Preempt kernels, but can't find anything on the RT variant.

I'm looking to have a go at it, but one of the difficulties is that the RPi kernel is based on the (development branch) 3.1.19, while RT-Preempt is only published for stable 3.0 and 3.2 series kernels.

Does anyone have any advice to offer before I plunge in?

Cheers,
Tom

[dom]

Start with bootc's 3.2 kernel.
http://www.bootc.net/archives/2012/06/1 ... 20-kernel/

(the R-Pi official images are likely to switch to this in the future).

Freeeow, that was quick. And exactly what I was looking for. Thanks!

I'm looking to have a go at it, but one of the difficulties is that the RPi kernel is based on the (development branch) 3.1.19, while RT-Preempt is only published for stable 3.0 and 3.2 series kernels.

(Sorry, bit OT...)
I thought with the switch to the 3.x.y numbering scheme (which AIUI is simply a continuation of the 2.6.x.y scheme) that the odd=development even=stable was no longer being used? (i.e. everything apart from the "rc" releases is stable)

(Sorry, bit OT...)
I thought with the switch to the 3.x.y numbering scheme (which AIUI is simply a continuation of the 2.6.x.y scheme) that the odd=development even=stable was no longer being used? (i.e. everything apart from the "rc" releases is stable)

Quite right, it seems. Nonetheless, there doesn't seem to be a RT-Preempt patch for 3.1-series kernels (or 3.3 for that matter) - only 3.0, 3.2 and 3.4.

Is anyine working on porting the 3.2 RT-PREEMPT patchset to the Raspi?

I had a previous version of the rpi 3.2.27 kernel patched and booting with RT_PREEMPT, I recently downloaded the zippped archive of the git repo and patched t without error again.

Unfortunatly I can no longer boot the kernel using the same .config as before as it seems to crash.

I have not looked into it much yet maybe will get time to this weekend.

attached is a photo of the boot screen, doubt if it will help much, I will try compile with further debug options later.

I had a previous version of the rpi 3.2.27 kernel patched and booting with RT_PREEMPT, I recently downloaded the zippped archive of the git repo and patched t without error again.

may keep an eye on this thread: viewtopic.php?f=71&t=9634
I'll try another throw at RT/BFS pretty soon