On 12/22/2025 5:34 AM, Romain Naour wrote:
Hello Bajjuri,
Le 19/12/2025 à 21:58, Bajjuri, Praneeth a écrit :
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)
Preempt-rt issues are fixed over the time, especially for the 6.12 kernel since
it's the first release with preempt-rt included.
Yes , But the fixes should be going thru the v6.12 stable tree IMO and
v6.18 stable as well moving forward.
But Preempt-rt specific changes
might be too risky to backport to linux-stable branches. We can hope that
v6.18-rt will never exist but who knows...
I hope the same as well. The other reason we are monitoring v6.18-rt is
for arm32 platform support to mainline
Reading FWIW :
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1578136/am4378-support-status-of-am4378-soc
In other hand, it's only a few dozen of commits (as of today), some of them not
related to TI SoCs.
Agreed, We are evaluating these fixes and will bring up with real time
linux and keep you posted here once analysis is completed.
FYI : TI is a member for RT Linux https://realtime-linux.org/membership/
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.
The linux-ti-staging-6.18 is too recent, some TI specific changes (like the
DMA-BUF support in remoteproc) is not yet rebased:
https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/commit/drivers/remoteproc/remoteproc_cdev.c?h=ti-linux-6.12.y&id=3119d723957038270225867130678d76081dee0c
Yes, We have just started LTS Migration process and will migrate all
features/drivers from January to
https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/log/?h=ti-linux-6.18.y
(Including the remoteproc changes you mentioned)
6.12 combination with scarthgap is in maintenance mode at this moment.
Ok.
The evaluation of linux-ti-staging-rt moving forward will be for master and
wrynose in 2026.
kernel 6.18 was released only few weeks ago (uboot 2026.01 is not released yet)
for uboot, currently pulling the latest rc tag to
https://git.ti.com/cgit/ti-u-boot/ti-u-boot/log/?h=ti-u-boot-2026.01 ,
But the plan is to pull till final 2026.01 tag is made and then port the
delta patches from upstream backport and ti-u-boot-2025.01 branches.
We will consider switching to Wrynose as soons as the TI-SDK will be released.
Thank you that will be good. Till Wrynose is tagged, We will continue to
use Yocto master with 6.18 and 2026.01 branches for migration effort.
Best regards,
Romain
[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 ''}
-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#19389):
https://lists.yoctoproject.org/g/meta-ti/message/19389
Mute This Topic: https://lists.yoctoproject.org/mt/108819037/21656
Group Owner: [email protected]
Unsubscribe: https://lists.yoctoproject.org/g/meta-ti/unsub
[[email protected]]
-=-=-=-=-=-=-=-=-=-=-=-
