Linux Kernel

A common and unified Linux Kernel source tree is provided and used by the Linux microPlatform. The latest continuous release is available at

The Linux Kernel recipe can be found in the Meta-LMP layer, under the meta-lmp-base/recipes-kernel/linux directory.

Linux microPlatform Kernel Configuration Fragments

Together with the unified Linux Kernel tree, the Linux microPlatform also provides an additional repository for the kernel configuration fragments. The latest continuous release for the kernel configuration fragments is available at

You can find the list of supported BSP definitions and configuration fragments used under the lmp-kernel-cache/bsp directory.

The fragments repository works similarly to the upstream yocto-kernel-cache repository, so the same development workflow and documentation applies. See the Yocto Project Linux Kernel Development Manual for more information on how to work and manage the kernel metadata and configuration fragments.

Linux microPlatform with Real-Time Linux Kernel

The recipe meta-lmp/meta-lmp-base/recipes-kernel/linux/ can be used for real-time linux, which is based on the linux-lmp recipe, but extended to include the PREEMPT_RT patch-set (updated along with stable kernel updates).

At this moment only the intel-corei7-64 machine configuration is supported.

Building Linux microPlatform with linux-lmp-rt

Set the PREFERRED_PROVIDER_virtual/kernel to linux-lmp-rt in meta-subscriber-overrides/conf/machine/include/

$ cat meta-subscriber-overrides/conf/machine/include/
PREFERRED_PROVIDER_virtual/kernel_intel-corei7-64 = "linux-lmp-rt"

Now just build the Linux microPlatform image as usual.

Linux microPlatform with Linux upstream

The recipe meta-lmp/meta-lmp-base/recipes-kernel/linux/ can be used to build the Linux microPlatform with the upstream kernel tree instead of the LmP unified tree. linux-lmp-dev also uses the Linux microPlatform Kernel Configuration Fragments repository for a compatible configuration.

Building Linux microPlatform with linux-lmp-dev

Set the PREFERRED_PROVIDER_virtual/kernel to linux-lmp-dev in meta-subscriber-overrides/conf/machine/include/

$ cat meta-subscriber-overrides/conf/machine/include/
PREFERRED_PROVIDER_virtual/kernel = "linux-lmp-dev"

Now just build any of the supported Linux microPlatform images.

Specifying Linux git tree, branch and commit revision

The following variables can be also set in meta-subscriber-overrides/conf/machine/include/ in order to build linux-lmp-dev using a specific linux tree, branch or commit revision:

KERNEL_REPO = "git://" # Kernel git repository
KERNEL_BRANCH = "master" # Git kernel branch (default: master)
KERNEL_COMMIT = "94710cac0e" # Kernel commit revision (default: HEAD)
KERNEL_META_REPO = "git://" # Kernel configuration fragments repository
KERNEL_META_BRANCH = "master" # Git kernel meta branch (default: master)
KERNEL_META_COMMIT = "1c67180cfe" # Kernel meta commit revision (default: HEAD)
LINUX_VERSION = "4.19-rc" # Linux kernel base version (base package version)