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custom_kernel.md

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Custom kernel recipe for Isar

Contents

Summary

Isar provides a recipe to build custom kernels for Debian-based distributions. It uses templates to generate the debian meta-data (such as debian/control) and Debian's BuildProfiles to handle some of the distro specific variations. It should be noted that Isar has moved away from using the kernel's builddeb script since it would not generate all the packages we need (and in particular perf).

Features

The linux-custom recipe provides support for:

  1. Sources to the custom Linux kernel may be specified via SRC_URI

  2. Configure the kernel via an in-tree or an external defconfig via KERNEL_DEFCONFIG

  3. Integrate kernel configuration tweaks via configuration fragments (.cfg files)

  4. Patches to the linux kernel may be specified via SRC_URI

  5. Ensure that the Isar recipe PV matches the kernel release identifier (KERNEL_RELEASE)

  6. Produce a linux-image package that ships the kernel image and modules

  7. Allow the name of the kernel image to be changed via KERNEL_FILE (defaults to vmlinuz)

  8. Produce a linux-headers package which includes kernel headers and kbuild scripts/tools

  9. The linux-headers package shall support native and cross compiles of out-of-tree kernel modules. However, when built in cross-compilation mode, it cannot be used on the target so far.

  10. Produce a linux-libc-dev package to support user-land builds

  11. Only build/ship the linux-libc-dev package if instructed to (KERNEL_LIBC_DEV_DEPLOY equals to "1")

  12. Support both native and cross compiles (ISAR_CROSS_COMPILE)

  13. Support for the following kernel architectures:

    • arm
    • arm64
    • mips
    • x86

  14. Support devshell (kernel configuration shall be applied)

Future

In the future, the recipe may be extended to:

  1. Package perf

  2. Support inclusion/build of dts files listed in SRC_URI

  3. Be compatible with Ubuntu

  4. When cross-building, generate kernel-headers for both host and target

Examples

The linux-custom recipe is currently used by the linux-mainline package and is used mainline recipe may be used for some basic testing. This recipe is being used by the following machines:

  • de0-nano-soc
  • qemumipsel