From c27c61424ffa67d24753ce4ac58a60116700da18 Mon Sep 17 00:00:00 2001 From: zeljkoavramovic <29905129+zeljkoavramovic@users.noreply.github.com> Date: Tue, 6 Oct 2020 15:33:57 +0200 Subject: [PATCH] can utils [can-j1939-install-kernel-module.md]: better explanation for adding backports, fixed typos and grammar (#247) * Add tutorial how to compile kernel with can-j1939 module * cosmetic changes * improvement by adding debian backports to separate sources list * better explanation for adding backports * fixed typos * fixed grammar * improvement by adding debian backports to separate sources list * better explanation for adding backports * fixed typos * fixed grammar Co-authored-by: Zeljko Avramovic --- can-j1939-install-kernel-module.md | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/can-j1939-install-kernel-module.md b/can-j1939-install-kernel-module.md index ae8b26b..7de99a3 100644 --- a/can-j1939-install-kernel-module.md +++ b/can-j1939-install-kernel-module.md @@ -34,7 +34,7 @@ We will download Debian patched kernel 5.8. First update your sources avra@vm-debian:~$ sudo apt update ``` -and then see if what Debian pathed kernel source versions are available +and then look at available Debian patched kernel source packages ``` avra@vm-debian:~$ apt-cache search linux-source @@ -47,7 +47,13 @@ linux-source-5.7 - Linux kernel source for version 5.7 with Debian patches linux-source-5.8 - Linux kernel source for version 5.8 with Debian patches ``` -If kernel 5.8 does not show in your linux-sources list (it shows in mine since I have already upgraded stock 4.19 kernel to backported 5.7), then you will need to add backports to your sources list. Here is how my **/etc/apt/sources.list** looks like (you will need to append at least last line to yours): +If kernel 5.8 does not show in your linux-sources list (it shows above in mine since I have already upgraded stock 4.19 kernel to backported 5.7), then you will need to add backports to your sources list. It is best to do it like this + +``` +echo 'deb http://deb.debian.org/debian buster-backports main contrib' | sudo tee -a /etc/apt/sources.list.d/debian-backports.list +``` + +Alternatively, or in case you have problems with installation of some packages, or you just want to have everything in a single list, here is what my **/etc/apt/sources.list** looks like (you will need to append at least last line to yours) ``` deb http://security.debian.org/debian-security buster/updates main contrib @@ -56,10 +62,10 @@ deb-src http://security.debian.org/debian-security buster/updates main contrib deb http://deb.debian.org/debian/ buster main contrib non-free deb-src http://deb.debian.org/debian/ buster main contrib non-free -deb http://deb.debian.org/debian buster-backports main contrib non-free +deb http://deb.debian.org/debian buster-backports main contrib ``` -After adding backports try **sudo apt update** again, and **apt-cache search linux-source** should now show kernel 5.8 in the list, so you can install it's source package +After adding backports in one way or another, try **sudo apt update** again, and after that **apt-cache search linux-source** should show kernel 5.8 in the list, so you can install it's source package ``` sudo apt install linux-source-5.8 @@ -67,7 +73,7 @@ sudo apt install linux-source-5.8 and unpack it ``` -avra@vm-debian:/usr/src$ cd /usr/src +avra@vm-debian:~$ cd /usr/src avra@vm-debian:/usr/src$ sudo tar -xaf linux-source-5.8.tar.xz avra@vm-debian:/usr/src$ cd linux-source-5.8 ``` @@ -97,12 +103,12 @@ where we enable SAE J1939 kernel module as shown - SAE J1939 ``` -Now edit **/usr/src/linux-source-5.8/.config**, find below key and change it as this +Now edit **/usr/src/linux-source-5.8/.config**, find CONFIG_SYSTEM_TRUSTED_KEYS, change it as following ``` CONFIG_SYSTEM_TRUSTED_KEYS="" ``` -and save it. +and save the file. @@ -152,23 +158,23 @@ If it does then all you need to do is sudo depmod -av ``` -reboot once, and **modprobe** command from the above should finally work now. +reboot once, and **modprobe** command from the above should finally work. #### 4. Install headers if needed -You can have a problem with header file, to check that go in the file **/usr/include/linux/can.h** +You might have a problem with headers not being updated. To check that open file **/usr/include/linux/can.h** with ``` nano /usr/include/linux/can.h ``` -If in the struct **sockaddr_can** you don’t see **j1939**, then header files did not upgrade, so you need to do this manually +If in the struct **sockaddr_can** you don’t see **j1939**, then header files did not upgrade and you need to do it manually ``` sudo cp /usr/src/linux-source-5.8/include/uapi/linux/can.h /usr/include/linux/can.h sudo cp /usr/src/linux-source-5.8/include/uapi/linux/can/j1939.h /usr/include/linux/can/ ``` -This is the minimum for compiling some **J1939** code, but you might want to upgrade other header files as well. That's up to you. Enjoy! +That is the minimum for compiling some **J1939** C code, but you might want to upgrade other header files as well. That's up to you. Enjoy!