Hello, I am also very interested in back-porting. My project is currently on 4.9.9 and it is not possible to upgrade to the latest kernel at this time. I was wondering if you had any thoughts on what is required to achieve this? For example, it seems that the net stack in 5.4 is very different from 4.9 (even more so compared to 4.14) and I am having difficulties getting the kernel to compile after following your cherry-pick suggestion. I'm wondering if you are familiar with the net changes and would know if it is a good idea to continue to try back-porting (is it even possible?) or if you know of any other option? Best Regards, Arnej Duranovic On Friday, October 25, 2019 4:39 AM, Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote: > On Fri, Oct 25, 2019 at 09:38:39AM +0200, Romain Forlot [IoT.bzh] wrote: > > > I used it in the mainline kernel without troubles. This is a a very good > > job, thanks. > > Ok, thanks for the answer. May be I will work on it in the next few months. > > Let's see. I'll keep you informed. > > Thank you for testing. I hope to get more feed back :) > > > Regards. > > On 18/10/2019 16:53, Oleksij Rempel wrote: > > > > > Hi, > > > On Fri, Oct 18, 2019 at 12:07:34PM +0200, Romain Forlot [IoT.bzh] wrote: > > > > > > > Hi, > > > > I am wondering what the cost is to backport the j1939 module to an old > > > > version like a v4.14 LTSI version. > > > > The backport should be quite easy: > > > > > > git cherry-pick -sx `git rev-list --reverse 2c1f9e26344483e2c74e80ef708d9c7fd2e543f4..9d71dd0c70099914fcd063135da3c580865e924c` > > > ...but it isn't :/ Some CAN patches are missing. We'll backport the stack to > > > v4.14.150 (or newer) and send a follow up mail. > > > However, the driver for the CAN adapter needs proper RX/TX frame ordering, > > > otherwise the stack will explode. > > > This is fixed in flexcan mainline. And involves a handful of patches. Other > > > drivers probably need more fixing. Some CAN hardware may even lack the hardware > > > support for proper ordering, that is time stamping registers. > > > > > > > And what the impact is of backporting the whole CAN stack on the CAN drivers? > > > > The stack has no impact on the drivers, but requirements on proper RX/TX > > > > ordering, see above. > > > > > > > Are there any modifications to drivers once the CAN stack is updated ? > > > > Yes, as long as they don't have proper RX/TX ordering. > > > > > > So, which CAN driver are you planing to use? > > > Regards, > > > Oleksij & Marc > > > > -- > > Romain Forlot - Embedded Engineer - IoT.bzh > > romain.forlot@xxxxxxx - www.iot.bzh - +33675142438 > > -- > > Pengutronix e.K. | | > Industrial Linux Solutions | http://www.pengutronix.de/ | > Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
