And the option ‘grep’ prints lines that contain a match for a pattern. The default action is to display all messages from the kernel ring buffer. It also contains the kernel compiler’s user name (in parentheses).ĭmesg – display message or driver message – is used to examine or control the kernel ring buffer. The /proc/version file specifies the version of the Linux kernel, the version of gcc used to compile the kernel, and the time of kernel compilation. And the command “uname -v” prints the kernel version. Some operating systems (e.g., FreeBSD, HP-UX) have the same name as their underlying kernels others (e.g., GNU/Linux, Solaris) do not. The kernel name might be the same as the operating system name printed by the ‘-o’ or ‘–operating-system’ option, but it might differ. The command “uname -s” prints the kernel name. The “uname -r” prints the kernel release. The three uname comamnds to know about Linux Kernel are “uname -r” “uname -v” and “uname -s”. (There are circumstances where this is appropriate, and the Ubuntu kernel documentation will explain what to do but this is very likely not one of them.KERNEL-NAME NODENAME KERNEL-RELEASE KERNEL-VERSION MACHINE PROCESSOR HARDWARE-PLATFORM OPERATING-SYSTEM If you blindly debuild using that source package, you’ll wait for many hours before the build finishes. In any case it’s not a good idea to use the linux source package itself (as obtained using apt-get source), since that’s really designed for building all the kernels used in Ubuntu. To test your module, you’ll need to either build a full upstream kernel, or build your module using the approach given in point 1 above. If you want to base your development on the upstream kernel (which is what I’d recommend), you should clone Linus’ tree and work there. If you are simply trying to build third-party modules for your kernel, Is suggested that you investigate the package kernel-package, which hasīeen designed to ease the task of creating kernel image packages. If you wish to use this package to create a custom Linux kernel, then it This package is mainly meant for other packages to use, in order to build Note however the caveat from the package description: This will include the Ubuntu kernel patches, allowing you to build a kernel with the same features as your current kernel. The hostnamectl command is typically used to display information about the system’s network. The uname command includes additional options that you can use to get more information about your kernel. If you want to base your development on the Ubuntu kernel, use the appropriate linux-source package for your release of Ubuntu, that’s currently linux-source-4.10.0: apt install linux-source-4.10.0 4 Commands to Find Linux Kernel Version uname Command. This will ensure that the module is built for the kernel you’re running. Then you can build a module in another directory by running make -C /lib/modules/$(uname -r)/build SUBDIRS="/path/to/your/module" modules This will provide the necessary files so that the /lib/modules/$(uname -r)/ symlinks point to something meaningful. If you’re trying to build an external module (including one you’re developing), you only need the kernel headers: apt install linux-header-$(uname -r) So maybe someone can help: what is the best and correct way for me to get a working kernel and matching source on ubuntu (well, xubuntu, but I don't think it should matter)? Do I need to get the code from and build it from scratch? I kinda want to match the shipping Ubuntu kernel. Still error: version magic '4.10.17 SMP mod_unload ' should be '4.10.17-041017-generic SMP mod_unload I go back to the source tree I downloaded, and when I run $ make kernelversionĭownload kernel 4.10.17 and install it. Looking in dmesg, it shows: version magic '4.10.17 SMP mod_unload ' should be '4.10.0-37-generic SMP mod_unload 'Īt this point, I'm confused. I go to compile and modprobe my driver, it fails. Picking 'linux' as source package instead of 'linux-image-4.10.0-37-generic' I then download the source code: $ apt-get source linux-image-$(uname -r) I want to try my hand at writing a linux driver.
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