What is make Savedefconfig?

What is make Savedefconfig?

make savedefconfig minimizes the generated defconfig skipping redundant configs that are implied by others.

What make Oldconfig does?

make oldconfig takes the current kernel configuration in the . config file, and updates it based on the new kernel release. To do this, it prints out all configuration questions, and provides an answer for them if the option is already handled in the configuration file.

Where can I find Defconfig?

Defconfig files are typically stored in the kernel tree at arch/*/configs/ . It may be desirable to modify the kernel configuration beyond what the hardware platform requires in order to support a particular hardware or software feature.

What does make config?

make menuconfig is one of five similar tools that can configure Linux source, a necessary early step needed to compile the source code. make menuconfig , with a menu-driven user interface, allows the user to choose the features of Linux (and other options) that will be compiled.

What is Linux Buildroot?

Buildroot is a set of Makefiles and patches that simplifies and automates the process of building a complete and bootable Linux environment for an embedded system, while using cross-compilation to allow building for multiple target platforms on a single Linux-based development system.

What does typing make Oldconfig in a Linux kernel source directory accomplish?

6 Answers. It reads the existing . config file that was used for an old kernel and prompts the user for options in the current kernel source that are not found in the file. This is useful when taking an existing configuration and moving it to a new kernel.

How do I use Localmodconfig?

“make localmodconfig” Create a config based on current config and loaded modules (lsmod). Disables any module option that is not needed for the loadedmodules. To create a localmodconfig for another machine, store the lsmod of that machine into a file and pass it in as a LSMOD parameter.

How do you rebuild a kernel?


  1. Change to the directory holding the Linux source code.
  2. Configure the kernel options.
  3. Compile the kernel and modules.
  4. Make a backup copy of the old kernel just in case things don’t work out.
  5. Install the new kernel and System. map to the /boot directory.
  6. Install the kernel modules under /lib/modules.

How do I install a new kernel?

Method 1: Manually install new Linux kernel in Ubuntu using command line

  1. Step 1: Check current installed version.
  2. Step 2: Download the mainline Linux kernel of your choice.
  3. Step 4: Install the downloaded kernel.
  4. Step 5: Reboot Ubuntu and enjoy the new Linux kernel.

How do I find the kernel config file?

The Linux kernel configuration is usually found in the kernel source in the file: /usr/src/linux/. config . It is not recommended to edit this file directly but to use one of these configuration options: make config – starts a character based questions and answer session.

What is the use of Menuconfig?

make menuconfig gives the user an ability to navigate forwards or backwards directly between features, rather than using make config by pressing the ↵ Enter key many, many times just to navigate linearly to the configuration for a specific feature.

How does defconfig work in the Linux kernel?

Defconfig: This feature allows the kernel build system to add a new config supplied by defconfig to the .config file. More precisely, the Kbuild system checks all the Kconfig files. If defconfig specifies an option in the file, the Kbuild system uses the specified value to add the option to the .config.

Why is the.config file copied from defconfig?

The .config file is not simply copied from your defconfig file. The motivation for storing defconfig in such a format is next: in defconfig we can specify only options with non-default values (i.e. options we changed for our board). This way we can keep it small and clear.

What does make old config do in Linux?

You can use make oldconfig to update the old config interactively by applying options missing in the old config file. Defconfig: This feature allows the kernel build system to add a new config supplied by defconfig to the .config file. More precisely, the Kbuild system checks all the Kconfig files.

Do you need to make make menu config?

It is not recommended just a bare make menuconfig. The required config depends on three things: See also Kernel configuration for distributions. The first paragraph: Configuring a kernel was once a fairly straightforward process, only requiring knowledge of what hardware needs to be supported.