TipsAndTricks/KernelDevelopmentWithEsdk: Difference between revisions
m (Bavery moved page TipsAndTricks/KernelDevelopment to TipsAndTricks/KernelDevelopmentWithEsdk: We want to emphasize the usage of the esdk in this workflow) |
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This manual describes the Linux kernel development process with Yocto and devtool. | This manual describes the Linux kernel development process with Yocto and devtool. | ||
== Setup your environment == | == Setup your bitbake build environment == | ||
Open a new terminal window and navigat to your poky directory. We'll refer to this terminal as your 'bitbake terminal'. | |||
The following command will configure the Yocto build environment | The following command will configure the Yocto build environment | ||
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source poky/oe-init-build-env kernel-dev | source poky/oe-init-build-env kernel-dev | ||
== Checkout the kernel source tree and construct .config == | == Build Extensible SDK (bitbake terminal) == | ||
bitbake -c populate_sdk_ext core-image-minimal | |||
== Install Extensible SDK (bitbake terminal) == | |||
The ESDK installer can be found in /path_to_build_directory/kernel-dev/tmp/deploy/sdk/ | |||
./tmp/deploy/sdk/poky-glibc-x86_64-core-image-minimal-corei7-64-toolchain-ext-2.3.sh | |||
Follow the installer instructions and provide a target directory for your ESDK installation e.g /path_to_esdk/ | |||
== Checkout the kernel source tree and construct .config (bitbake terminal) == | |||
Check out the Linux kernel source and construct a .config from the Yocto kernel configuration segments. The sources can be found in /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto. | Check out the Linux kernel source and construct a .config from the Yocto kernel configuration segments. The sources can be found in /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto. | ||
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devtool modify linux-yocto | devtool modify linux-yocto | ||
== | == Setup your ESDK build environment (ESDK terminal) == | ||
Open a new terminal and setup your build environment. Let's refer to this terminal as your 'ESDK terminal' | |||
. /path_to_esdk/environment-setup-corei7-64-poky-linux | |||
NOTE: If you see this message you will really need to open a new terminal :). | |||
SDK environment now set up; additionally you may now run devtool to perform development tasks. | |||
Run devtool --help for further details. | |||
WARNING: attempting to use the extensible SDK in an environment set up to run bitbake - this may lead to unexpected results. Please source this script in a new shell session instead. | |||
== Build your kernel (ESDK terminal) == | |||
Navigate to your workspace directory e.g /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto | |||
and build the kernel | |||
make | |||
== Modify your kernel and commit your changes (ESDK terminal)== | |||
== Build an image with your kernel changes == | You can navigate to the Linux source directory (/path_to_build_directory/kernel-dev/workspace/sources/linux-yocto) and modify the kernel. Commit your kernel changes. | ||
== Build an image with your kernel changes (optional) (bitbake terminal) == | |||
devtool build-image core-image-minimal | devtool build-image core-image-minimal | ||
== Export patches and create a bbappend file == | == Export patches and create a bbappend file (bitbake terminal) == | ||
To export your commits to patches and a bbappend file use the following command. | To export your commits to patches and a bbappend file use the following command. | ||
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The patches and the bbappend can be found in /path_to_poky_directory/meta-yocto-bsp/recipes-kernel/linux. | The patches and the bbappend can be found in /path_to_poky_directory/meta-yocto-bsp/recipes-kernel/linux. | ||
== Build image == | == Build image with your modified kernel (bitbake terminal) == | ||
You can now build an image which will include your kernel patches. | You can now build an image which will include your kernel patches. | ||
Revision as of 23:39, 22 June 2017
Overview
This manual describes the Linux kernel development process with Yocto and devtool.
Setup your bitbake build environment
Open a new terminal window and navigat to your poky directory. We'll refer to this terminal as your 'bitbake terminal'.
The following command will configure the Yocto build environment
source poky/oe-init-build-env kernel-dev
Build Extensible SDK (bitbake terminal)
bitbake -c populate_sdk_ext core-image-minimal
Install Extensible SDK (bitbake terminal)
The ESDK installer can be found in /path_to_build_directory/kernel-dev/tmp/deploy/sdk/
./tmp/deploy/sdk/poky-glibc-x86_64-core-image-minimal-corei7-64-toolchain-ext-2.3.sh
Follow the installer instructions and provide a target directory for your ESDK installation e.g /path_to_esdk/
Checkout the kernel source tree and construct .config (bitbake terminal)
Check out the Linux kernel source and construct a .config from the Yocto kernel configuration segments. The sources can be found in /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto.
devtool modify linux-yocto
Setup your ESDK build environment (ESDK terminal)
Open a new terminal and setup your build environment. Let's refer to this terminal as your 'ESDK terminal'
. /path_to_esdk/environment-setup-corei7-64-poky-linux
NOTE: If you see this message you will really need to open a new terminal :).
SDK environment now set up; additionally you may now run devtool to perform development tasks. Run devtool --help for further details. WARNING: attempting to use the extensible SDK in an environment set up to run bitbake - this may lead to unexpected results. Please source this script in a new shell session instead.
Build your kernel (ESDK terminal)
Navigate to your workspace directory e.g /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto and build the kernel
make
Modify your kernel and commit your changes (ESDK terminal)
You can navigate to the Linux source directory (/path_to_build_directory/kernel-dev/workspace/sources/linux-yocto) and modify the kernel. Commit your kernel changes.
Build an image with your kernel changes (optional) (bitbake terminal)
devtool build-image core-image-minimal
Export patches and create a bbappend file (bitbake terminal)
To export your commits to patches and a bbappend file use the following command.
devtool finish linux-yocto /path_to_poky_directory/meta-yocto-bsp/
The patches and the bbappend can be found in /path_to_poky_directory/meta-yocto-bsp/recipes-kernel/linux.
Build image with your modified kernel (bitbake terminal)
You can now build an image which will include your kernel patches.
Execute the following command from your build directory ( e.g /path_to_build_directory/kernel-dev/)
bitbake core-image-minimal
