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Subject: Re: [meta-raspberrypi] Is Preempt-rt still supported in master / latest releases?
To: yocto@lists.yoctoproject.org
From: "Carles Sole" <Carles.SoleMendi@de.bosch.com>
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Date: Sun, 05 Feb 2023 23:38:05 -0800
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Hi Joel,

thanks for creating the issue.

Does the solution from Aleksandr work for you with raspberrypi4-64? The fun=
ny thing is for me it doesn't. As I mentioned above if I use his solution:

for MACHINE =3D "raspberrypi4-64" in local.conf, the .config file has follo=
wing configs:
CONFIG_HAVE_PREEMPT_LAZY=3Dy
CONFIG_PREEMPT_NONE=3Dy
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set

If in the local.conf I replace the machine to MACHINE =3D "raspberrypi4" an=
d I bitbake again, the .config file looks as follow:
CONFIG_HAVE_PREEMPT_LAZY=3Dy
CONFIG_PREEMPT_LAZY=3Dy
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_RT=3Dy
CONFIG_PREEMPT_COUNT=3Dy
CONFIG_PREEMPTION=3Dy

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_P=
REEMPT_NONE=3Dy is getting set. Whereas with Machine raspberrypi4 it works =
as expected.

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Hi Joel,<br /><br />thanks for creating the issue. <br /><br />Does the sol=
ution 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 />f=
or MACHINE =3D "raspberrypi4-64" in local.conf, the .config file has follow=
ing configs:<br />CONFIG_HAVE_PREEMPT_LAZY=3Dy<br />CONFIG_PREEMPT_NONE=3Dy=
<br /># CONFIG_PREEMPT_VOLUNTARY is not set<br /># CONFIG_PREEMPT is not se=
t<br /><br />If in the local.conf I replace the machine to MACHINE =3D "ras=
pberrypi4" and I bitbake again, the .config file looks as follow:<br />CONF=
IG_HAVE_PREEMPT_LAZY=3Dy<br />CONFIG_PREEMPT_LAZY=3Dy<br /># CONFIG_PREEMPT=
_NONE is not set<br /># CONFIG_PREEMPT_VOLUNTARY is not set<br /># CONFIG_P=
REEMPT is not set<br />CONFIG_PREEMPT_RT=3Dy<br />CONFIG_PREEMPT_COUNT=3Dy<=
br />CONFIG_PREEMPTION=3Dy<br /><br />Meaning when the machine is set to ra=
spberrypi4-64 and CONFIG_PREEMPT_RT is requested via the .cfg file in the f=
ile .config in work directory CONFIG_PREEMPT_NONE=3Dy is getting set. Where=
as with Machine raspberrypi4 it works as expected.

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