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--- kernel_build [2025/01/21 23:17] – ounsatn
+++ kernel_build [2025/01/21 23:45] (current) – ounsatn
@@ Line 33: / Line 33: @@
 Extract kernel source 5.15 with
 <code> tar -xf linux-5.15.tar.xz </code>
+it will create a folder linux-5.15, this is what i call __**source tree**__ ( or kernel source )
 {{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/KernelSourceFile.JPG}}
@@ Line 54: / Line 56: @@
 apply dos2unix on each patches, and in folder patches ( extracted from patches-5.15.86-rt56)
-<code>dos2unix patch*
+<code>dos2unix patch-5*
 cd patches
 dos2unix *.patch </code>
-Go to kernel source and patch like below
+__Go to kernel source__ and patch like below
@@ Line 74: / Line 76: @@
-go to source tree folder :
+__stay in source tree folder :__
 Change localversion in file localversion-rt
@@ Line 87: / Line 89: @@
 It gives a file named "config"
-Copy this file in source tree as ".config" name.
+Copy this file in source tree folder as **".config"** name.
+go to source tree folder to build menuconfig
-go to source tree to build menuconfig
 <code> make menuconfig </code>
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Make_menuconfig.JPG}}
-.config taken from force changed feature like :
-- General Setup / Local version string, now it's empty (let it empty )
+.config taken from force has features like :
-- General Setup / Preemption model => Fully Preemptible Kernel ( Real-Time ) : this give the rt56.
+ - General Setup / Local version string, now it's empty (let it empty )
+ - General Setup / Preemption model => Fully Preemptible Kernel ( Real-Time ) : this give the rt features.
        this option is only available after patching with rt56 patch.
+( and of course other features ...)
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Menuconfig_generalsetup.JPG}}
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Menuconfig_Premptionmodel.JPG}}
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Menuconfig_CheckRTl.JPG}}
-As we have the kernel configuration, you can see what features are already in the kernel, and which are not.
+As we have the kernel configuration, you can see what features are already in the kernel, and whiches are not.
-To test kernel, i will compile a module which is not there by default , I will do it with "Joystick Interface" :
+To test kernel viability, i will compile a module which is not there by default , I will do it with "Joystick Interface" :
-It's in  : DeviceDrivers >>> Input device support >>> Joystick Interface
+It's in  : DeviceDrivers >> Input device support >> Joystick Interface
 Just put a M like below , then save & Exit menuconfig
-Now when your back in source tree type
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/JoystickModule.JPG}}
+Now when your back in source tree folder type :
 <code> make modules_prepare </code>
-then go to your module folder in source tree.
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/make_module_prepare.JPG}}
-For joystick it's in /src/builddemo/linux-5.15/drivers/input
+Then go to your module folder in source tree.
+For joystick module we've checked in kernel config, it's located in /src/builddemo/linux-5.15/drivers/input
 and launch :
-<code> ~/src/builddemo/linux-5.15/drivers/input$ make -C ~/src/builddemo/linux-5.15/ M=$PWD </code>
-Make detect you have check joystick device as module in kernel config, so it compile the associated module source file.
+<code>
+syntax is : make -C <path_to_kernel_dir> M=$PWD
+so i do :
+~/src/builddemo/linux-5.15/drivers/input$ make -C ~/src/builddemo/linux-5.15/ M=$PWD
+</code>
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Make_module.JPG}}
+Make detects that you have checked joystick device as module in kernel config, so it compiles the associated module source file.
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/Make_module_2.JPG}}
 Then you have your module.
 you can check version in module with command
 <code> grep -a inm joydev.ko </code>
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/grep_inmusic.JPG}}
 Now it's time to copy module on your force.
 On AKF :
 remount / partition in rw :
 <code> mount remount / -o rw,exec,remount </code>
 copy module file to /usr/lib/modules/5.15.89-inmusic-2023-01-18-rt56/kernel/drivers/input
-Each time i copy a module, i try to respect the source tree path, so if you don't have drivers/input folder, create it and put module inside.
+Each time i copy a module, i try to respect the source tree path, so if you don't have **drivers/input** folder, create it and put module inside.
-then do command depmod
+then do command depmod to says system new module is there.
 <code> depmod </code>
+Issue command lsmod to see current loaded modules :
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/lsmod_before.JPG}}
+do modprobe joydev
+Issue it again, tadaaaa it's there.
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Kernel/modprobe_joydev.JPG}}