- ARM (armel + armhf) supports OMAP3/4/5, iMX.6 and RasPi
- ARM-LPAE (armel + armhf) version is useful for OMAP5 only!
- ARM64 (arm64) is for PinePhone (and future 64 bit ARM devices)
- MIPS (mipsel) is for JZ4730 (Mipsbook) and JZ4780 (CI20)
Please refer to http://git.goldelico.com/letux-kernel-featurelist.php about the status of support for each feature/device.
|rc (latest/alpha):||5.15-rc7||changes||2021-10-26||arm arm64 CI20(mips) x86 L400(mips) arm+lpae replicant-arm||For alpha test: develop and test new features|
|mainline (beta):||5.14.14||changes||2021-10-26||arm arm64 CI20(mips) x86 L400(mips) arm+lpae replicant-arm|
|longterm:||5.10.75||changes||2021-10-26||arm arm64 CI20(mips) x86 L400(mips) arm+lpae replicant-arm|
|stable:||5.4.155||changes||2021-10-26||arm CI20(mips) L400(mips) arm+lpae replicant-arm||
multi-platform, mature enough for daily use
supports Pyra (except Display Rotation), Letux Cortex 15, OpenPandora, GTA04, Letux Cortex 8, BeagleBoard, BeagleBone, PocketBeagle, PandaBoard, OMAP5EVM, Udoo neo, RasPi 3B+
|longterm master:||4.19.213||changes||2021-10-26||arm CI20(mips) L400(mips) arm+lpae replicant-arm||
multi-platform, mature for daily use
supports Pyra, Letux Cortex 15, OpenPandora, GTA04, Letux Cortex 8, BeagleBoard, BeagleBone, PocketBeagle, PandaBoard, OMAP5EVM, Udoo neo, RasPi 3B+
|longterm:||4.14.252||changes||2021-10-26||arm CI20(mips) L400(mips) arm+lpae replicant-arm UdooNeo||
device tree based, multi-platform, mature for daily use (now including telephony)
supports Pyra (except screen rotation), OpenPandora, GTA04, Letux Cortex 8, BeagleBoard, BeagleBone, PocketBeagle, PandaBoard, OMAP5EVM
fully device tree
|longterm:||4.9.287||changes||2021-10-19||arm CI20(mips) L400(mips) arm+lpae||
device tree based, multi-platform, mature enough for daily use (now including telephony)
supports OpenPandora, GTA04, Letux Cortex 8, BeagleBoard, BeagleBone, PocketBeagle, PandaBoard, OMAP5EVM
fully device tree
|GTA04||includes patches so that we can build kernels for Replicant (GTA04 and source code only)|
|longerm [EOL]:||3.12.37||GTA04||GTA04 (except A5) feature complete (incl. camera), but lacks some power management|
|longerm [EOL]:||3.12-replicant||GTA04||GTA04 (except A5) kernel modified/configured differently to better support Replicant|
|longerm [EOL]:||3.7-neil-plus||GTA04||GTA04 (except A5): good power management, lacks some features (e.g. camera)|
|longerm [EOL]:||2.6.30-rc4||jz4730||Letux 400 and other Mini-Books|
The Mainline-Plus Kernel concept (tracking linus/master = mainline)
Basically there is a "stable" master branch and rolling release candidate branches and feature development ("work in progress") branches. Feature branches are patch set sitting on top of "letux-base". The "latest" branch is a copy of the latest "stable master" branch.
Every time Linus publishes a new release candidate (typically once per week on average), we update the letux-base branch and rebase all our new features. For example, the "letux-base" can currently be v4.19-rc2. One week later, we will have v4.19-rc3.
Then we merge all feature branches on top of letux-base and this creates e.g. letux-4.19-rc3. Note, that there is no linear history from letux-4.19-rc2 to letux-4.19-rc3 because there are rebases involved.
We also maintain long-term and stable kernels as defined by <www.kernel.org>. Every now and then, we merge in the latest stable release from kernel.org and sometimes backport important changes from the rolling release candidates.
supported devices (through different device tree files)
- BeagleBoard C, BeagleBoard XM
- BeagleBoard (C/XM) with Openmoko Beagle Hybrid expansion board
- GTA04A3, GTA04A4, GTA04A5 (Letux 2804)
- GTA04b2 (Letux 3704)
- GTA04b3 (Letux 7004)
- planned: GTA04b7 (Neo900)
- PandaBoard ES
- OMAP5432EVM + Pyra development boards
- Letux Cortex 8 (similar to PocketBeagle)
- Letux Cortex 15 (Pyra CPU-Board stand-alone)
- Letux Cortex 15 EVAL (Evaluation Board for Letux Cortex 15)
- Pyra Phone (planned)
- Udoo Neo
- Letux 400 (mostly untested)
- RaspBerry Pi 3B+
Please note that U-Boot is responsible for loading the correct device tree file.
For a list of features supported on each device, please see http://git.goldelico.com/letux-kernel-featurelist.php.
- follows the latest kernel releases and includes security patches
- based on the latest http://www.kernel.org (release candidates)
- add the latest Linux features
- have a rolling letux-base
- aim at full support of the hardware by drivers that are not (yet) in mainline ("plus")
- provide drivers for as many hardware features as possible in a clean way
- can be used in daily life
- our patches are pushed to go upstream so that the 'plus' part gets smaller and smaller step by step
- have older long-term kernels (maybe missing some features)
Features / Maturity
The branches tracking linus/master currently don't support well (please refer to [issues][Issues]):
- WiFi power management
- 3D Accelerator (PVR/SGX)
it works on the BeagleBoard XM with OpenMoko-BeagleHybrid display expander and on a BeagleBoard C w/o.
it appears that everything works (incl. audio)
not working: AESS based audio, 3D Accelerator (PVR/SGX)
Please download, test and patch the kernel tree. Please submit patches against the latest version (e.g. 4.5-rc2) and mail them to the letux-kernel mailing list. Thank you!
If you have problems with git, please refer to Contribute.
Please report all kernel issues through the "Issues" tab on this project.
There is a public mailing list dedicated to the Letux-Kernel: http://lists.goldelico.com/mailman/listinfo.cgi/letux-kernel
We actively work on the kernel and upstreaming patches, but this needs some funding for the developers. If you want to donate, you are welcome!
Building the kernel:
git clone http://git.goldelico.com/letux-kernel.git cd letux-kernel git checkout latest make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- letux_defconfig uImage LOADADDR=0x80008000 dtbs INSTALL_MOD_PATH=/tmp/kernel-modules-$$ modules modules_install cp arch/arm/boot/uImage modules arch/arm/boot/dts/omap*.dtb /mount/sdcard/boot/
You can also use git://git.goldelico.com/letux-kernel.git but this is a little less reliable on weak connections.
There is also letux_lpae_defconfig which enables LPAE and disables OMAP3+4 support.
Please refer to the GTA04 Rootfs for installation instructions of a complete distribution (bootloader, kernel, rootfs, LXDE GUI).