{"id":152,"date":"2017-02-12T06:42:11","date_gmt":"2017-02-12T06:42:11","guid":{"rendered":"http:\/\/blog.warbel.net\/?p=152"},"modified":"2017-02-12T06:42:11","modified_gmt":"2017-02-12T06:42:11","slug":"how-to-compile-the-linux-kernel-from-source-on-ubuntu-16-04-lts","status":"publish","type":"post","link":"https:\/\/blog.warbel.net\/index.php\/2017\/02\/12\/how-to-compile-the-linux-kernel-from-source-on-ubuntu-16-04-lts\/","title":{"rendered":"How to Compile the Linux Kernel from Source on Ubuntu 16.04 LTS"},"content":{"rendered":"

Background\/Problem:<\/h1>\n

My KVM host, after a recent upgrade (see posts below) cannot start with the kernel option iommu=on enabled. Technically it can, however the system will not start due to a driver\/bug issue with an additional SATA card I have installed:
\n:$ lspci
\n…
\n02:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9230 PCIe SATA 6Gb\/s Controller (rev 11)<\/strong><\/p>\n

Disks simply do not register when using iommu. The Bugzilla report can be found here<\/a>\u00a0and more information can be had here.<\/a>\u00a0The references are old, so my hope is that it has been patched in the latest kernel images.<\/p>\n

\"\"<\/p>\n

Furthermore, I need the latest kernel to use the Quad tuner PCI-E card I have:
\n:$ lspci
\n…
\n05:00.0 Multimedia video controller: Conexant Systems, Inc. CX23887\/8 PCIe Broadcast Audio and Video Decoder with 3D Comb (rev 04)<\/strong><\/p>\n

The quad tuner needs kernel 4.8 to run. More information here<\/a>.\u00a0So fundamentally, I need to compile the latest stable kernel image to get the full use of my system and then pass the PCIE tuner card through to my Media VM.<\/p>\n

The Process:<\/h1>\n

I recommend doing this I have done, inside a reasonably powered Virtual machine. I’ve gone back through things and corrected my instructions when I’ve run into problems. This process will generate a Debian package that you can install on any Debian based OS (such as Ubuntu).<\/p>\n

Problems:<\/h2>\n
    \n
  1. Not giving enough RAM, CPU and disk space to the VM to compile (at all) or in a timely manner.\n
      \n
    1. I’ve given my VM 4 cores, 4GB RAM and an ‘external’ hard drive of 30GB to use to compile the kernel.<\/li>\n<\/ol>\n<\/li>\n
    2. Utilize all the cores<\/a>. add the line:\u00a0CONCURRENCY_LEVEL= 4 to \/etc\/kernel-pkg.conf to use all 4 cores when compiling (once the package is installed, see below)<\/li>\n
    3. Not having some essential packages installed that caused the process to stop. such as libssl-dev.<\/li>\n<\/ol>\n
      \"\"

      Using all the cores makes it go much faster!<\/p><\/div>\n

      Steps:<\/h2>\n

      At the command prompt, install all the packages you need to compile the kernel:
      \n:$ sudo apt-get install fakeroot kernel-package gcc build-essential libncurses5-dev qt5-default\u00a0libssl-dev<\/strong><\/p>\n

      Download, to a disk that has ~20GB free, the latest stable kernel version. At the time of writing this was 4.9.9. Extract it and cd into the directory
      \n:$ wget https:\/\/cdn.kernel.org\/pub\/linux\/kernel\/v4.x\/linux-4.9.9.tar.xz
      \n<\/strong>:$ tar -xf linux-4.9.9.tar.xz<\/strong>
      \n:$ cd linux.-4.9.9<\/strong><\/p>\n

      Assuming you’re running this in a desktop Linux environment, run make xconfig, alternatively, if you’re using a terminal server, make menuconfig will do.<\/p>\n

      The default settings should do in most instances.<\/p><\/div>\n

      Save and close the configuration. Make the build environment clean, then begin the compile process:
      \n:$ make-kpkg clean<\/strong>
      \n:$ fakeroot make-kpkg \u2013initrd \u2013revision=4.9.9.linux kernel_image kernel_headers<\/strong><\/p>\n

      You can save time by compiling a kernel with only the hardware that you have installed. Do this by deselecting them in the xconfig\/menuconfig. The downside is that if you add new hardware, you’ll need to recompile the kernel.<\/p><\/div>\n

      For an explanation on the above fakeroot command, please see this Debian manual page<\/a>. You should now have a custom kernel image compiling.<\/p>\n

      Once it’s completed, cd to the upper directory, and install the kernel:
      \n:$ cd ..<\/strong>
      \n:$ sudo dpkg -i linux-image-4.9.9_4.9.9.linux_amd64.deb linux-headers-4.9.9.9_4.9.9.9.linux_amd64.deb<\/strong>
      \n:$ sudo shutdown -hr now<\/strong><\/p>\n

      After restarting the VM, you can check the currently running version of the kernel by typing at the command prompt:<\/p>\n

      \"\"<\/p>\n

      Additional extra step:<\/h2>\n

      Prove to yourself that you’ve created a usable package by spinning up a shiny new VM, sftp the debian package to it, then install and reboot.<\/p>\n

      Further reading:<\/h2>\n

      https:\/\/www.cyberciti.biz\/faq\/debian-ubuntu-building-installing-a-custom-linux-kernel\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

      Background\/Problem: My KVM host, after a recent upgrade (see posts below) cannot start with the kernel option iommu=on enabled. Technically it can, however the system will not start due to a driver\/bug issue with an additional SATA card I have … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-152","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/posts\/152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/comments?post=152"}],"version-history":[{"count":6,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/posts\/152\/revisions"}],"predecessor-version":[{"id":163,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/posts\/152\/revisions\/163"}],"wp:attachment":[{"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/media?parent=152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/categories?post=152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.warbel.net\/index.php\/wp-json\/wp\/v2\/tags?post=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}