Hi Joel,<br /><br />thanks for creating the issue. <br /><br />Does the solution from Aleksandr work for you with raspberrypi4-64? The funny thing is for me it doesn't. As I mentioned above if I use his solution:<br /><br />for MACHINE = "raspberrypi4-64" in local.conf, the .config file has following configs:<br />CONFIG_HAVE_PREEMPT_LAZY=y<br />CONFIG_PREEMPT_NONE=y<br /># CONFIG_PREEMPT_VOLUNTARY is not set<br /># CONFIG_PREEMPT is not set<br /><br />If in the local.conf I replace the machine to MACHINE = "raspberrypi4" and I bitbake again, the .config file looks as follow:<br />CONFIG_HAVE_PREEMPT_LAZY=y<br />CONFIG_PREEMPT_LAZY=y<br /># CONFIG_PREEMPT_NONE is not set<br /># CONFIG_PREEMPT_VOLUNTARY is not set<br /># CONFIG_PREEMPT is not set<br />CONFIG_PREEMPT_RT=y<br />CONFIG_PREEMPT_COUNT=y<br />CONFIG_PREEMPTION=y<br /><br />Meaning when the machine is set to raspberrypi4-64 and CONFIG_PREEMPT_RT is requested via the .cfg file in the file .config in work directory CONFIG_PREEMPT_NONE=y is getting set. Whereas with Machine raspberrypi4 it works as expected.