Hi Romain,
On 12/19/2025 11:31 AM, Romain Naour wrote:
Hello,
Le 04/10/2024 à 17:18, Ryan Eatmon via lists.yoctoproject.org a écrit :
Adding needed recipes for initial testing and development of the 6.12
kernel for the next LTS.
Signed-off-by: Ryan Eatmon <[email protected]>
---
...
.../linux/linux-ti-staging-rt_6.12.bb | 9 +++++
create mode 100644
meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-rt_6.12.bb
...
diff --git a/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-rt_6.12.bb
b/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-rt_6.12.bb
new file mode 100644
index 00000000..9e5c4ee4
--- /dev/null
+++ b/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-rt_6.12.bb
@@ -0,0 +1,9 @@
+require linux-ti-staging_6.12.bb
+
+KERNEL_LOCALVERSION:append = "-rt"
+
+# Look in the generic major.minor directory for files
+# This will have priority over generic non-rt path
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}-6.12:"
Previous linux-ti-staging-rt recipes [1] used a specific branch
"ti-rt-linux-6.1.y" obtained by merging the TI vendor "ti-linux-6.1.y" branch
and the preempt-rt v6.1-rt branch [2].
BRANCH = "ti-rt-linux-6.1.y"
Since preempt-rt is now merged in the kernel 6.12, indeed we can use the same
kernel sources with a specific configuration fragment (hence there is no
ti-rt-linux-6.12.y [3]).
But the preempt-rt project still maintain a v6.12-rt branch with all remaining
patches [4]. Actually the project still recommend to apply the latest PREEMPT_RT
patches [5].
Should the linux-ti-staging-rt recipe follow the preempt-rt stable branch as
before?
Porting existing project (kirkstone 6.1 -> scarthgap 6.12) using
linux-ti-staging-rt recipe, users may expect that this recipe still use the
preempt-rt stable branch.
Thoughts?
Indeed when we started 6.12 LTS baseline migration, Since PREEMPT_RT is
part of mainline we have started using a unified kernel branch ( With
config fragment switch) to build RT and non RT baselines.
The preempt-rt project didnt have a 6.12 branch till august in the year at
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git/
The development and hosting of v6.12-rt including additional on the fly
features is something new and i hope it continue with next LTS (6.18 as
well)
As you can see with
https://patchwork.yoctoproject.org/project/ti/list/?series=41242 , we
are in process of switching development with master and next LTS yocto
to 6.18 baseline and we are assessing how and if RT need to be
maintained as linux-ti-staging-rt-6.18 recipe based on the feature
differences in v6.18-rt vs mainline kernel.
6.12 combination with scarthgap is in maintenance mode at this moment.
The evaluation of linux-ti-staging-rt moving forward will be for master
and wrynose in 2026.
[1]
https://git.yoctoproject.org/meta-ti/tree/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-rt_6.1.bb?h=kirkstone#n9
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git/log/?h=v6.1-rt
[3] https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel
[4]
https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git/log/?h=v6.12-rt
[5] https://realtime-linux.org/getting-started-with-preempt_rt-guide/
Best regards,
Romain
+
+include ${@ 'recipes-kernel/linux/ti-extras-rt.inc' if d.getVar('TI_EXTRAS')
else ''}
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