The Linaro Qualcomm Landing Team is pleased to announce the new release of the Linaro Linux release for Qualcomm™ Snapdragon® 410 processor. The Linaro Linux release 15.11 is a Debian-based Linaro Build that provides developers with a desktop like environment using Debian and the LXDE desktop, as well as a console-only image.
What’s new in this release
- Based on Linux kernel v4.2.4
- Migration from Ubuntu 15.04 to Debian 8.0 (jessie)
- Support for hardware video encoder (v4l2 kernel driver and Gstreamer plugins)
- Support for SPI on Low Speed expansion connector
- Bug fixed:
- GPIO-F (e.g. PIN28 on Low speed expansion) should be 1.8V , not 3.7V
- Xorg memory leak
- Compilation error “fatal error: msm_vidc.h: No such file or directory”
- wifi: wcn36xx: ERROR SMD_EVENT (259) not supported
- Click LXCE icon > System Tools > Htop doesn’t run htop
- HDMI resolution change not working
- HDMI display sleep, no way to wake back up?
- Thermal management issue that could lead to unexpected thermal shutdown
- USB read and write performances that were preventing USB webcam to function properly
The Linaro Linux version 15.11 for the Snapdragon 410 supports the following features:
- Provides a working Debian environment with access to Debian repositories (apt-get) and updates. It is based on Debian 8.0 (aka jessie).
- It is based on Linux kernel 4.2.4.
- It is based on proprietary firmware available on Qualcomm Developer Network.
- The following images are released:
bootimage that includes prebuilt kernel and initrd
developerimage that includes core packages as well as typical development packages (headless)
alipimage that includes a minimal desktop environment GUI using LXDE
- All images have a pre-configured user called
linaro, and the password for this user is set to
- The root file system should be flashed in the onboard eMMC.
- The following features are supported on the DragonBoard 410c:
- Quad Core ARMv8 A53 CPU (@1.2GHz)
- Adreno 306 GPU, powered by
freedrenoMesa/Gallium GPU driver, version 10.6.8
- OpenGL 2.1, OpenGLES 2.0
- xf86-video-freedreno driver v1.3.0, with XA support enabled
- Cpufreq, using ondemand governor by default
- CPU thermal sensors, and thermal management using the step wise governor
- HDMI display and audio using the onboard ADV7533 MIPI/DSI Receiver with HDMI Transmitter from Analog Devices
- UART, SD, eMMC
- USB2.0 (Mouse, Keyboard, Storage, Ethernet)
- Wifi and Bluetooth using integrated WCN3620, using proprietary firmware and wcn36xx driver
- Hardware accelerated video codecs using dedicated Snapdragon coprocessor
Information about the DragonBoard 410c
For more information about the DragonBoard 410c, please check the following website and wiki:
How to install and use this release
To install this release please follow the instructions from the DragonBoard 410c Linux user guide.
This release contains proprietary firmware. You can download the proprietary firmware separately, from here. All the required firmware files are pre-installed, and our images are bound to the following license agreement.
Running the ALIP Desktop image
The ALIP/LXDE image is expected to provide a desktop-like experience, as such it is recommended to use an HDMI monitor, as well as USB keyboard and mouse. The default image will directly boot to the login screen by default. However a root console login will also be started on the serial console.
Note: The default bootargs enable the kernel messages to be displayed on the serial console.
Running the Developer based image
If you have flashed the developer image, when booting the board you will end up in a root login on the serial console. If you have an HDMI monitor connected, you will also have login terminals on the display
How to get and customize the kernel source code
Building the Linux kernel from source
The Linux kernel used in this release is available via tags in the Linaro Qualcomm Landing Team git repository:
git: http://git.linaro.org/landing-teams/working/qualcomm/kernel.git tag: debian-qcom-dragonboard410c-15.11 defconfig: arch/arm64/defconfig kernel/configs/distro.config
The kernel image (
Image) is located in the
boot image and partition and the kernel modules are installed in the root file system. It is possible for a user to rebuild the kernel and run a custom kernel image instead of the released kernel. You can build the kernel using any recent GCC release using the git tree, tag and defconfig mentioned above. This release only supports booting with device tree, as such both the device tree blobs need to be built as well.
The DragonBoard 410c is an ARMv8 platform, and the kernel is compiled for the Aarch64 target. Even though it is possible to build natively, on the target board, It is recommended to build the Linux kernel on a PC development host. In which case you need to install a cross compiler for the ARM architecture. It is recommended to download the Linaro GCC cross compiler.
To build the Linux kernel, you can use the following instructions:
git clone -n http://git.linaro.org/landing-teams/working/qualcomm/kernel.git cd kernel git checkout -b kernel-15.11 debian-qcom-dragonboard410c-15.11 export ARCH=arm64 export CROSS_COMPILE=<path to your GCC cross compiler>/aarch64-linux-gnu- make defconfig distro.config make -j4 Image dtbs KERNELRELEASE=4.2.4-linaro-lt-qcom
Additionally, you might want or need to compile the kernel modules:
make -j4 modules KERNELRELEASE=4.2.4-linaro-lt-qcom
Building a boot image
You now need to create a valid boot image with your own kernel build.
On your host PC, we need to install the following tools:
sudo apt-get install device-tree-compiler git clone git://codeaurora.org/quic/kernel/skales
The boot image consists of the table of device tree (
dt.img), the kernel image (
Image) and an init ramdisk image.
dtbTool is a standalone application that will process the DTBs generated during the kernel build, to create the table of device tree image. This tool is included in the
skales git tree cloned above.
./skales/dtbTool -o dt.img -s 2048 arch/arm64/boot/dts/qcom/
To create the boot image, you also need a ramdisk image, and you can use the one from the release:
mkbootimg (also in the git tree previously cloned) is a standalone application that will process all files and create the boot image that can then be booted on the target board, or flash into the on-board eMMC. The boot image also contains the kernel bootargs, which can be changed as needed in the next command:
./skales/mkbootimg --kernel arch/arm64/boot/Image \ --ramdisk initrd.img-4.2.4-linaro-lt-qcom \ --output boot-db410c.img \ --dt dt.img \ --pagesize 2048 \ --base 0x80000000 \ --cmdline "root=/dev/disk/by-partlabel/rootfs rw rootwait console=ttyMSM0,115200n8"
Booting a custom boot image
Assuming you have now built a valid boot image called
boot-db410c.img, you can run the following
fastboot command to boot it on the board:
sudo fastboot boot boot-db410c.img
If you want to permanently use a custom kernel image, you can update the boot image and reflash it into the
sudo fastboot flash boot boot-db410c.img
How to get and customize the bootloader
While the first stage bootloader is proprietary and released as firmware blob available on Qualcomm Developer Network, the second stage bootloader is
LK and is open source.
git: http://git.linaro.org/landing-teams/working/qualcomm/lk.git tag: debian-qcom-dragonboard410c-LA.BR.1.2.4-00310-8x16.0-linaro1
To build the LK bootloader, you can use the following instructions:
git clone git://codeaurora.org/platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8.git -b LA.BR.1.1.3.c4-01000-8x16.0 git clone http://git.linaro.org/landing-teams/working/qualcomm/lk.git -b debian-qcom-dragonboard410c-LA.BR.1.2.4-00310-8x16.0-linaro1 cd lk make -j4 msm8916 EMMC_BOOT=1 TOOLCHAIN_PREFIX=<path to arm-eabi-4.8 tree>/bin/arm-eabi-
The second stage bootloader is flashed on the
aboot partition, you can now flash your board with:
sudo fastboot aboot ./build-msm8916/emmc_appsboot.mbn
How to get and customize Debian/Ubuntu packages source code
This release is based on Debian 8.0 (aka jessie), and it is not possible to use a different Debian release (e.g. it is not possible to downgrade to an older Debian release, nor is it possible to use a newer release, such as the one being currently developed).
Since all packages installed in Linaro Debian-based images are maintained either in Debian archives or in Linaro repositories, it is possible for users to update their environment with commands such as:
sudo apt-get update sudo apt-get upgrade
All user space software is packaged using Ubuntu or Debian packaging process. As such you can find extensive information about using, patching and building packages in the Ubuntu packaging guide or The Debian New Maintainers Guide. If you quickly want to rebuild any package, you can run the following commands to fetch the package source code and install all build dependencies:
sudo apt-get update sudo apt-get build-dep <pkg> apt-get source <pkg>
Then you can rebuild the package locally with:
cd <pkg-version> dpkg-buildpackage -b -us -uc
- you can drop patches in debian/patches/ and update debian/patches/series before building with dpkg-buildpackage to customize the source code.
- all associated .deb files will be located in the root folder, and can be installed in the system with dpkg -i
- all these commands should be executed on the target directly, not on the development host. It is generally enough to build packages natively, on the target platform. For some packages, it is possible to cross compile Ubuntu/Debian packages however this goes beyond the scope of this wiki page.
Using X11 with modesetting video driver and GLAMOR
While not enabled by default, it is possible use evaluate X11/GLAMOR. In order to start X server with the modesetting driver, with GLAMOR support, your first need to make sure that X server is not running:
sudo systemctl stop lightdm
Then you can run the following commands to switch from freedreno video driver, to modesetting, and restart the LXDE desktop:
sudo sed -i 's/freedreno/modesetting/' /usr/share/X11/xorg.conf.d/42-freedreno.conf sudo systemctl start lightdm
To switch back to freedreno video driver, please run:
sudo systemctl stop lightdm sudo sed -i 's/modesetting/freedreno/' /usr/share/X11/xorg.conf.d/42-freedreno.conf sudo systemctl start lightdm
Feedback and Support
For general question or support request, please go to 96boards.org Community forum.
Bugs will be reviewed and prioritized by the team. For any bug report it is recommended to provide as much information as possible, and at the very list please include the name of the release you are using, the output of
dpkg -l to list all packages installed, as well, as the boot log (output of
Qualcomm Snapdragon is product of Qualcomm Technologies, Inc.