|latest mainline release candidate:||4.5-rc2||device tree based, multi-platform, almost mature enough for daily use|
|mainline:||4.4.0||device tree based, multi-platform, not mature for daily use|
|stable:||3.12.37||feature complete (incl. camera), but lacks some power management|
|stable:||3.12-replicant||kernel modified/configured differently to better support Replicant|
|linux-next:||3.7-neil-plus||good power management, lacks some features (e.g. camera)|
|mainline:||gta04-for-next||a set of patches on top of linux-next ready for upstreaming|
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. The "latest" branch is a copy of the latest rolling release candidate branch.
Each time Linus publishes a new release candidate (typically once per week on average), we create a new letux-base branch and merge in all our new features. For example, the "master" branch can currently be 3.12.7 but the rolling work is on 4.5-rc2. One week later, we will have 4.5-rc3.
As soon as our rolling kernel is feature complete (i.e. nothing important is completely missing) we plan also update the master branch to follow major Linux releases (e.g. 4.5.0).
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 15 (Pyra CPU-Board stand-alone)
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 Platforms.
- follows the latest kernel releases and includes security patches
- based on the latest www.kernel.org (release candidates)
- add the latest Linux features
- have a rolling letux-base
- add to support the GTA04 devices what is 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
Features / Maturity
basically everything can be supported (and was in the past before we transitioned to the Device Tree). Therefore the most feature-complete version is still the "master" branch (3.12.7).
The branches tracking linus/master currently don't support well (please refer to [issues][Issues]):
- WiFi power management
- Microphone Sense
- 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)
there is some problem with an EHCI error (for the unconnected HSIC interface) and panel drivers are work in progress. Otherwise it works.
Please download, test and patch the kernel. Please submit patches against the latest version (e.g. 4.5-rc2) and mail them to the letux-kernel mailing list. Thank you!
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/gta04-kernel.git cd gta04-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/gta04-kernel.git but this is a little less reliable on weak connections).
Please refer to the GTA04 Rootfs for installation instructions of a complete distribution (bootloader, kernel, rootfs, LXDE GUI).