Zephyr SDK
The Zephyr Software Development Kit (SDK) includes the toolchains for all supported target architectures as well as the host tools, such as QEMU and OpenOCD, for testing and debugging the Zephyr RTOS.
The toolchains for the following target architectures are supported:
- ARC (32-bit and 64-bit; ARCv1, ARCv2, ARCv3)
- ARM (32-bit and 64-bit; ARMv6, ARMv7, ARMv8; A/R/M Profiles)
- Microblaze (32-bit)
- MIPS (32-bit and 64-bit)
- Nios II
- RISC-V (32-bit and 64-bit; RV32I, RV32E, RV64I)
- SPARC (32-bit and 64-bit; SPARC V8, SPARC V9)
- x86 (32-bit and 64-bit)
- Xtensa (sample_controller, intel_ace15_mtpm, intel_tgl_adsp, nxp_imx_adsp, nxp_imx8m_adsp, espressif_esp32, espressif_esp32s2, espressif_esp32s3)
The following host tools are available as part of the Zephyr SDK:
- BOSSA
- OpenOCD
- QEMU
- Xilinx QEMU
Releases
The Zephyr SDK bundle releases are available for the following host platforms:
- Linux (AArch64, x86-64)
- macOS (AArch64, x86-64)
- Windows (x86-64)
These binaries can be downloaded from here.
For future release plans, please refer to the Release Plan document in the wiki.
Build Process
The Zephyr Project maintains the infrastructure necessary to build and test the Zephyr SDK, and it is highly recommended to utilise this infrastructure for generating the Zephyr SDK binaries.
When you submit a pull request to the Zephyr SDK repository, CI will automatically build and test the Zephyr SDK with the changes in the pull request and upload the binaries to the pull request check run, which you can download for further local testing as necessary.
Locally building the Zephyr SDK is currently not supported because setting up the environment to do so is highly complex and the resource requirements far exceed what is found on common developer machines.
Workflow to Test Patches with Zephyr SDK
The following workflow can be used to test a patch for GCC, for example, building the SDK remotely:
- Submit your DRAFT gcc PR to Zephyr's GCC fork (etc.)
- Update
.gitmodules
in sdk-ng to point to the fork with your gcc commit(s) - Resync submodules (
git submodule sync --recursive && cd gcc && git pull
) - Checkout the gcc commit hash in sdk-ng's
gcc
submodule and commit the.gitmodule
changes (git add .gitmodules gcc && git commit -s
) - Submit a DRAFT PR to sdk-ng with the submodule change(s)
Zephyr's CI will then build a new toolchain, which will be available in the PR check step. Verify that the GCC fix behaves as expected with the generated SDK.
Release Process
To create a new Zephyr SDK release:
- Update the VERSION file with the new version (e.g. 0.11.0 or 0.11.0-beta1)
- On https://github.com/zephyrproject-rtos/sdk-ng/releases, create a new tag
named with the version number prefixed with
v
(e.g. for the version 0.11.0, the tag name should bev0.11.0
) and add the release information. - Once the release is published, CI will build the Zephyr SDK bundles for all supported host platforms and will upload the binaries to the release page.
For more detailed information on the release process, please refer to the Release Process document in the wiki.
Submodule Update Process
The Zephyr SDK repository contains various submodules, such as binutils
and
gcc
, required for building the Zephyr SDK.
When updating a submodule, the following procedure should be followed:
- Push a topic branch to the submodule repository.
- Create a pull request from the topic branch to the default (current) branch of the submodule repository.
- Create a pull request in the Zephyr SDK repository to update the submodule reference to the tip of the topic (pull request) branch.
- When the pull request in the Zephyr SDK repository passes the CI and the submodule pull request is sufficiently reviewed, merge the submodule pull request.
- Update the pull request in the Zephyr SDK repository to reference the merged commit in the submodule repository.
- Merge the pull request in the Zephyr SDK repository.
When updating the picolibc
submodule, the picolibc
module in the west.yml
of the main Zephyr repository
must also be updated to reference the same commit.