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A CIP kernel maintenance release is a tested revision of a Civil Infrastructure Platform (CIP) Super Long-Term Support (SLTS) kernel series. To consume one safely, identify a compatible series, check the official branch or tag, record its commit and upstream baseline, build it for your board, test the complete boot and hardware stack, and deploy with a rollback path. Maintainers follow a separate pipeline of upstream-fix selection, backporting, review, automated and hardware testing, and a provenance-rich announcement.
What CIP SLTS means
CIP (Civil Infrastructure Platform) is a Linux Foundation collaboration for industrial-grade embedded systems. Its kernel and selected core-package work targets maintenance periods of at least 10 years, longer than the normal window of many upstream stable or LTS branches. The project is intended for equipment such as transportation controls, energy systems, factory automation, railways, medical devices, and remote infrastructure where replacing hardware or requalifying software is difficult. See CIP’s kernel and core-package scope and its kernel-team overview.
Long support applies to a CIP kernel series, not automatically to every board, vendor driver, bootloader, application, or product built from it. You still own hardware integration, configuration, security response, qualification, and field-update design.
| Kernel type | Typical role | Important qualification |
|---|---|---|
| Upstream stable | Short-lived fixes for a current upstream release | Maintenance ends relatively soon |
| Upstream LTS | Longer-lived general-purpose baseline | Support duration and hardware fit vary by series |
| Vendor BSP | Board-specific drivers, firmware, and documentation | Vendor security and lifecycle practices determine longevity |
| CIP SLTS | Industrial-focused maintenance and organized backports over at least 10 years | Board and product support still require downstream engineering |
| CIP real-time variant | Deterministic-latency workloads using an RT-enabled branch or patch set | Latency, driver behavior, and test requirements differ from ordinary CIP kernels |
Active series and how to choose one
CIP’s April 28, 2026 status article lists five concurrent SLTS series: 4.4, 4.19, 5.10, 6.1, and 6.12. The same article describes 4.4 support from 2016 through 2027 and 6.12 support planned to approximately mid-2035. These are project-level series statements, not a promise that a particular production platform remains compatible for those dates. Read the dated status article before committing to a version.
#1 Best Overall
Do not select only by version number or recency. CIP’s staggered generations give product teams more than one opportunity to schedule a major migration; the 6.12 announcement explains that strategy.
| Criterion | Question to answer |
|---|---|
| Hardware | Are the SoC, board revision, peripherals, device tree, firmware, and bootloader supported? |
| Vendor integration | Will the board vendor maintain or accept patches for this base? |
| Lifecycle | Does the series cover the planned field life and certification schedule? |
| Real time | Is an RT variant required, and can you measure latency under production load? |
| Security | Can your team track CVEs, rebuild, sign, and distribute updates quickly? |
| Toolchain | Are compiler, binutils, libc, bootloader, root filesystem, and modules compatible? |
| Migration cost | Is moving to a newer series cheaper than preserving an old BSP? |
| Testing | Can you run hardware-in-the-loop, regression, power-loss, and rollback tests? |
What a maintenance release contains
A maintenance release is a revision within an existing series—not a new upstream major or minor release. A notation such as 6.12.x-cipN is illustrative; exact names differ by branch and artifact. Contents can include upstream stable and security fixes, selected backports, CIP-specific fixes, architecture or platform corrections, regression fixes, documentation or metadata changes, and RT changes where applicable.
Verify release provenance rather than trusting a version string. CIP announcements have identified the repository, branch, commit hash, upstream baseline, and CVEs addressed; a historical example is available in the CIP developer mailing-list archive.
Before you build
- Record the running kernel, board and revision, bootloader, storage layout, device-tree files, firmware, boot arguments, modules, and secure-boot requirements.
- Obtain serial-console or equivalent recovery access.
- Save a known-good kernel, device tree, modules, bootloader environment, and recovery image.
- Confirm the target toolchain and the image format required by your boot flow.
- For OTA devices, verify that an inactive A/B slot or another atomic rollback mechanism exists.
Obtain and verify a CIP source release
The authoritative Git repository identified by CIP is linux-cip.git. Kernel tarballs, when provided, are listed in the CIP directory on kernel.org mirrors. Branch names, tags, signing practice, and directory contents change, so inspect the current official announcement or repository instead of hard-coding a presumed “latest” branch.
git clone https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.gitcd linux-cipgit fetch --all --tagsgit branch -agit tag -l '*cip*' | tail -n 20- After checking the official release record, select the exact object:
git switch --detach <verified-cip-tag>orgit switch --track origin/<verified-cip-branch>. - Record identity and history:
git describe --always --dirty,git log -1 --decorate --show-signature, andgit show --stat --oneline HEAD.
For a tarball, run sha256sum <downloaded-file> and compare it with the checksum published in the same official directory or announcement. Never substitute an unchecked checksum.
Configure and build for your board
A generic build is not a universal embedded build. The required configuration, compiler, device tree, firmware, image target, and bootloader format depend on the platform.
Generic configuration
make <architecture>_defconfig
make olddefconfigUse the architecture or board configuration documented for your target; examples are not interchangeable across SoCs.
Cross-compilation
export ARCH=<target-architecture>
export CROSS_COMPILE=<toolchain-prefix>-
make <board-or-platform>_defconfig
make olddefconfig
make -j"$(nproc)"Preserve configuration and modules
cp .config config.before-maintenance
make olddefconfig
diff -u config.before-maintenance .config
make INSTALL_MOD_PATH="$PWD/staging" modules_installThe configuration diff exposes new symbols or changed defaults. Compilation proves only that the source built; it does not prove bootability, driver compatibility, real-time behavior, or application correctness.
Rank #3
- Used Book in Good Condition
Test before deployment
Use the same toolchain, configuration, workload, and measurement method used for the previous accepted image. At minimum, cover:
- Boot, reboot, watchdog, storage, filesystems, networking, USB, serial, and module loading.
- Device-tree devices, regulators, clocks, PHYs, firmware loading, and suspend/resume where applicable.
- Power-loss recovery, application startup, data integrity, and upgrade/rollback behavior.
- Representative production hardware, not only a CIP reference board.
- RT latency under the real workload for an RT variant; ordinary boot tests cannot establish real-time suitability.
- CVE status against the deployed configuration. A fix in source does not prove the vulnerable code is enabled or that a particular release contains it.
CIP has participated in broader kernel testing infrastructure, including KernelCI-related work; its maintenance expansion article describes organized backports and testing context.
Deploy with rollback
There is no universal flash command. eMMC, raw NAND, NOR, SD, U-Boot, FIT images, secure boot, vendor boot partitions, and A/B systems all require different procedures.
- Record the current image:
uname -aandcat /proc/version. - Back up the kernel image, device tree, modules, boot arguments, bootloader environment, and recovery media.
- Check free space, power stability, image integrity, and signing requirements.
- Generate the platform-specific kernel, device tree, firmware bundle, and boot image.
- Install into the inactive A/B slot or update the documented bootloader entry; avoid overwriting the only known-good image.
- Reboot only after verifying the inactive image and boot metadata.
- After boot, run
uname -randdmesg | head -n 50, then execute hardware and application smoke tests. - Keep the previous boot entry until acceptance testing is complete.
Secure Boot may reject an otherwise valid build unless it is signed through the product’s key-management process. A downgrade can also be unsafe if userspace, persistent data, or on-disk formats changed.
Maintainer workflow for creating a release
CIP’s public material describes the maintenance model, but not one beginner-facing command sequence. Treat the following as a release-control pipeline and follow the project’s current contribution and review channels.
1. Intake and scope
- Identify the upstream stable baseline and the exact CIP branch.
- Review relevant upstream stable and security fixes, CIP-specific fixes, regression reports, and required backports.
- Separate low-risk corrections from feature additions that alter behavior.
- Check licensing, attribution,
Signed-off-by, and any requiredFixes:orCc: stablemetadata.
2. Backport and document
- Apply patches in dependency order and resolve conflicts semantically, not just textually.
- Preserve original commit messages and attribution.
- Record changes made because older APIs, locking, data structures, or surrounding fixes differ.
- Remember that CIP can continue organized backports after an upstream LTS maintainer stops maintaining an older base, as described in the CIP maintenance announcement.
3. Review and test
- Submit patches through the current CIP development and review process.
- Obtain subsystem-maintainer review and flag material differences from upstream.
- Build supported architectures and test representative reference and production hardware.
- Run boot, storage, networking, device-tree, filesystem, watchdog, power-loss, application, upgrade, and rollback tests; add RT latency tests for RT branches.
4. Publish reproducible release metadata
The release record should state the exact version, upstream baseline, CIP branch, commit ID, date, changes since the previous release, CVEs addressed, known regressions, tested targets, configuration changes, artifact locations, checksums or signatures, and upgrade and rollback notes. An announcement modeled on the historical CIP release notices lets users reproduce the checkout and understand what was tested.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting
Branch or tag is missing
git fetch --all --tags
git branch -a
git tag -l '*cip*'Use the exact object named by the official announcement; do not infer a branch from a search snippet.
The patch applies but behavior is wrong
git show --stat
git log --oneline --ancestry-path <base>..HEADCompare configuration, boot logs, and application behavior with the accepted image. A clean Git apply is not semantic validation.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesBuild fails after olddefconfig
Inspect diff -u config.before-maintenance .config, then check compiler and binutils versions, generated headers, architecture settings, and board-specific instructions.
Kernel boots but hardware fails
dmesg -T
cat /proc/cmdline
lsmod
cat /proc/device-tree/modelCompare device-tree files, boot arguments, firmware, module versions, clocks, regulators, and PHY configuration with the previous image.
System does not boot
- Select the previous slot or boot entry.
- Use the serial console and restore the saved bootloader environment if necessary.
- Boot a known-good recovery image and reflash only the inactive slot where possible.
- Preserve the failed image and logs for diagnosis.
Real-time latency regresses
Repeat the pre-upgrade latency test with the same workload and method. Do not infer RT suitability from compilation or ordinary boot success.
CIP compared with alternatives
Upstream LTS
Upstream LTS can offer newer drivers and mitigations, but its support horizon may not match a long industrial field life. CIP adds an industrial maintenance model and can maintain older bases through organized backports.
Vendor BSP
A BSP may provide the best initial board support and proprietary drivers. Its security process and maintenance duration may be less predictable; moving to CIP can improve longevity but still requires board-specific integration.
Moving to a newer kernel
A newer base may reduce old-API and toolchain burden, yet migration can change device trees, drivers, boot behavior, certification status, and application behavior. Compare that work with the cost of preserving the existing BSP.
Quick Recap
Release gate checklist
- Series selected for hardware, lifecycle, RT, certification, toolchain, and test capacity.
- Official branch or tag, commit, upstream baseline, and artifact checksum recorded.
- Configuration diff reviewed; device tree, firmware, modules, and image format matched.
- Security fixes and CVEs checked against the actual deployed configuration.
- Boot, peripheral, storage, networking, application, power-loss, and rollback tests passed.
- Secure-boot signing, bootloader fallback, recovery access, and previous image preserved.
- Release notes list tested targets, known regressions, changes, and recovery instructions.
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