problems with realtime kernel on Beaglebone AI

[John Allwine]

I'm trying to use a real time kernel on the Beaglebone AI to get MachineKit running. I'm able to run MachineKit on a non-rt kernel (4.14.108-ti-r113), but when I update to the latest ti-rt kernel (4.14.108-ti-rt-r134), I get an error: 

user cannot gain I/O privileges - forgot 'sudo make setuid'?

Any idea what's going on? Is there a different kernel that is recommended?

[John Allwine]

I checked dmesg and saw this as well:

[  811.654246] warning: process `rtapi:0' used the deprecated sysctl system call with 8.1.2.

[Robert Nelson]

Let me know if we need to tweak the rt kernel config to support that..

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[John Allwine]

I'm not sure, what does that involve? It's probably worth a shot.

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[John Allwine]

This seems to be the source of the problem: https://github.com/machinekit/machinekit-hal/blob/9fca994e08e3f8384498e78ea8e8baa1c899e4db/src/rtapi/rtapi_app.cc#L1457

The system call iopl seems to be returning an error:

http://man7.org/linux/man-pages/man2/iopl.2.html

[John Allwine]

Per Cern's suggestion on the MachineKit forums, I simply removed the chunk of code that was throwing this error and all seems to be well.

On Friday, May 1, 2020 at 3:36:40 PM UTC-6, John Allwine wrote:

This seems to be the source of the problem: https://github.com/machinekit/machinekit-hal/blob/9fca994e08e3f8384498e78ea8e8baa1c899e4db/src/rtapi/rtapi_app.cc#L1457

The system call iopl seems to be returning an error:

http://man7.org/linux/man-pages/man2/iopl.2.html

On Fri, May 1, 2020 at 2:39 PM John Allwine <jo...@pocketnc.com> wrote:

I'm not sure, what does that involve? It's probably worth a shot.

On Fri, May 1, 2020 at 2:38 PM Robert Nelson <robert...@gmail.com> wrote:

Let me know if we need to tweak the rt kernel config to support that..

On Fri, May 1, 2020, 3:15 PM John Allwine <jo...@pocketnc.com> wrote:

I checked dmesg and saw this as well:

[  811.654246] warning: process `rtapi:0' used the deprecated sysctl system call with 8.1.2.

On Friday, May 1, 2020 at 2:13:15 PM UTC-6, John Allwine wrote:

I'm trying to use a real time kernel on the Beaglebone AI to get MachineKit running. I'm able to run MachineKit on a non-rt kernel (4.14.108-ti-r113), but when I update to the latest ti-rt kernel (4.14.108-ti-rt-r134), I get an error: 

user cannot gain I/O privileges - forgot 'sudo make setuid'?

Any idea what's going on? Is there a different kernel that is recommended?

--
For more options, visit http://beagleboard.org/discuss
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