On 3/14/23 2:52 PM, Denys Dmytriyenko wrote:
On Tue, Mar 14, 2023 at 11:46:23AM -0500, Bajjuri, Praneeth wrote:
On 3/14/2023 11:37 AM, Ryan Eatmon wrote:
Is there a better way of adding 6.1 without destroying the 5.10
support? Because until we have 6.1 up and working it would be
nice to have a working kirkstone for anyone using it...
Want to hear from denys as well based on past migration history.
IMO, there was a window during early migration at 5.10 phase where
we limited features to get the initial baseline ready and added
overlays over the time when kernel added the same.
Yes, this will be a major regression for existing customers using meta-ti
on Kirkstone!
Kirkstone is not productized yet, I know it is late but that is the
reality, customers should see Kirkstone as a preview until then.
In the past, Yocto migration was better aligned with the BSP migration and
both would happen at about the same time every year. So, the new BSP would
be available in the new Yocto branch and there was a choice of using an old
branch with stable and feature-complete BSP, or a new, but unstable and
initially incomplete branch. That provided extra freedom and flexibility
to start completely from scratch in the new branch...
That has changed a bit recently with 5.4 -> 5.10 migration happening in
Dunfell couple of years ago. And this time around 5.10 -> 6.1 in Kirkstone.
Both branches are Yocto LTS with many active users having some expectation
of stability.
Dunfell should use 5.10, Kirkstone should use the newer kernel, I don't
see the need to support both kernels on Kirkstone, especially if it will just
be temporary anyway. The juggling of both kernels during the migration will
slow us down, better to move fast here to get Kirkstone users back up and
running on the latest kernel.
In Dunfell, initial 5.10 recipe was added in mid-January 2021:
https://git.yoctoproject.org/meta-ti/commit/?id=874ff0d7f9f31703e0a71a9f5d968051b77c2df0
It broke things for many people and I suggested marking it to not be used
as the default:
https://git.yoctoproject.org/meta-ti/commit/?id=6496a0edeb8a84bfb1b9e13ec58814ea5babcde7
Three months later, by mid-April 2021 the change was reverted and 5.10 got
promoted to the default:
https://git.yoctoproject.org/meta-ti/commit/?id=7793303e6c1543e5058bf1a7e83ea72f3a45c079
Although I'd argue it was a bit too soon, as lots of DTBs/DTBOs still had to
be removed from machine configs:
https://git.yoctoproject.org/meta-ti/commit/?id=8b206b32ec181624b929aa7f998f26ed99e140a7
https://git.yoctoproject.org/meta-ti/commit/?id=fb0a0ddd25d4308152ce8243e00b444cbb5d565d
https://git.yoctoproject.org/meta-ti/commit/?id=9ea50db095f91bad7c9b2f643347dc25be6e10dd
https://git.yoctoproject.org/meta-ti/commit/?id=ad28c5878171ef5b364f6bc9d8a5de514731964b
https://git.yoctoproject.org/meta-ti/commit/?id=ba0ddc5ae9ebf9777d31283f272e4ed518e1f514
https://git.yoctoproject.org/meta-ti/commit/?id=43bf0f36a3ac62cc3378688358ba704a27b501ce
https://git.yoctoproject.org/meta-ti/commit/?id=8bdfe1413c00e0c55132989dafcf8d91827999c3
Remove all non-upstream Device Tree Overlays. We could have filtered them
out like as done in mainline and next testing. The issue would be as they
are added back to 6.1 and upstream we would need to conditionally
re-enable each. Easier to get a clean start.
I'd say we set DEFAULT_PREFERENCE = "-1" and, indeed, use automatic filtering
of DT files similar to mainline/next recipes, until 6.1 mostly catches up and
have majority of them integrated...
Automatic filtering will not work, there are also DTBs that are not overlays
that are not upstream either. In other cases DTB names have changed. We would
need to maintain a list for each 5.10, 6.1, mainline, and next kernels. That
multiplied by each MACHINE.
Populating KERNEL_DEVICETREE based on what the kernel actually builds seems
like the only reasonable solution today.
Andrew
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