Description

Gigabit Multimedia Serial Link (GMSL) are line drivers and receivers designed for video applications.

The MAX96706 is a compact deserializer especially suited for automotive camera applications. The MAX96709 is a compact serializer especially suited for automotive camera applications. The embedded control channel operates at 9.6kbps to 1Mbps in I2C mode, allowing programming of serializer, deserializer, and camera registers independent of video timing.

Source code

In order to purchase the source code please send an email to inquiries@ridgerun.com or You can submit your Inquiry at our Contact Us Page

Build Driver

Build kernel using Jetpack 2.3.1

Let's call $DEVDIR the path where you are going to build the kernel.

1. In a browser, navigate to: https://developer.nvidia.com/embedded/downloads, Locate and download the L4T Sources (L4T Sources 24.2.1 2016/11/21). Also, you can use wget command:

wget http://developer2.download.nvidia.com/embedded/L4T/r24_Release_v2.1/BSP/sources_r24.2.1.tbz2

2. Copy L4T kernel sources into DEVDIR.

cp sources_r24.2.1.tbz2 $DEVDIR

3. Expand tarball file.

tar -vxjf sources_r24.2.1.tbz2
# Decompress kernel
cd sources/
tar -xjf kernel_src.tbz2

4. Download GMSL serializer/deserializer driver patches and apply the patches.

cd $DEVDIR
tar -xzvf gmsl-r24.2.1-tx1.tar.gz
quilt push -a

5. Compile the kernel. Specify the path to the toolchain and architecture: (see http://developer.ridgerun.com/wiki/index.php?title=Compiling_Tegra_X1_source_code#Toolchain)

export CROSS_COMPILE=/opt/linaro/gcc-linaro-5.3-2016.02-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-
export CROSS32CC=/opt/linaro/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
export ARCH=arm64

6. Define and create destination directories.

export TEGRA_KERNEL_OUT=/home/$USER/ar0144_kernel/images
export TEGRA_MODULES_OUT=/home/$USER/ar0144_kernel/modules
mkdir -p $TEGRA_KERNEL_OUT
mkdir -p $TEGRA_MODULES_OUT

7. Configure your kernel

make -C sources/kernel/ O=$TEGRA_KERNEL_OUT tegra21_defconfig

8. Enable driver

make -C sources/kernel/ O=$TEGRA_KERNEL_OUT menuconfig

Select the driver. The menu option is located:

-> Device Drivers
  -> Multimedia support (MEDIA_SUPPORT [=y])
    -> Encoders, decoders, sensors and other helper chips
       <*> GMSL Serializer Deserializer driver

Save your new configuration.

9. Compile kernel, device tree and modules. To speed up compilation on multiprocessor systems, use -j n, this option tells make to execute many recipes simultaneously.

make -C sources/kernel/ O=$TEGRA_KERNEL_OUT zImage
make -C sources/kernel/ O=$TEGRA_KERNEL_OUT dtbs
make -C sources/kernel/ O=$TEGRA_KERNEL_OUT modules
make -C sources/kernel/ O=$TEGRA_KERNEL_OUT modules_install INSTALL_MOD_PATH=$TEGRA_MODULES_OUT

Test your Kernel image using Jetpack 2.3.1 root file system

1. Go to Linux_for_Tegra_64_tx1 directory. Let's call $JETPACKDIR the path where you installed your development directory or Jetpack.

cd $JETPACKDIR/64_TX1/Linux_for_Tegra_64_tx1/

2. Put the board into force USB Recovery Mode:

1. Power down the device. If connected, remove the AC adapter from the device. The device must be
powered OFF, and not in a suspend or sleep state.
2. Connect the Micro-B plug on the USB cable to the Recovery (USB Micro-B) Port on the device and
the other end to an available USB port on the host PC.
3. Connect the power adapter to the device.
4. Press POWER button
5. Press and hold the RECOVERY FORCE (REC) button.
6. While pressing the RECOVERY FORCE button, press and release the RESET button.
7. Wait 2 seconds and release the RECOVERY FORCE button

3. Use ./flash.sh in order to configure TX1 board, Also this script configures jetpack rootfs to be used as SD filesystem. Execute the script as follows:

sudo ./flash.sh jetson-tx1 mmcblk1p1

4. Create ext4 partition called "rootfs".

 sudo mkfs.ext4 /dev/mmcblk0p1 -L "rootfs"

5. Copy rootfs from jetpack 2.3.1

sudo cp -a $JETPACKDIR/64_TX1/Linux_for_Tegra_tx1/rootfs/* /media/$USER/rootfs/

6. Copy kernel image, device tree, and modules.

cd $TEGRA_KERNEL_OUT
cp -a arch/arm64/boot/Image /media/$USER/rootfs/boot/Image 
cp -a arch/arm64/boot/dts/tegra210-jetson-tx1-p2597-2180-a01-devkit.dtb /media/$USER/rootfs/boot/tegra210-jetson-tx1-p2597-2180-a01-devkit.dtb
cd $TEGRA_MODULES_OUT
sudo cp -a lib/* /media/$USER/rootfs/lib/

7. Unmount the device and Put the SD into the TX1 board, and boot the board.

umount /media/$USER/rootfs

8. Check kernel version. At this moment you can test the image created in order to see the new kernel is working correctly. You have to see a new kernel version:

uname -a
Linux tegra-ubuntu 3.10.96+ #1 SMP PREEMPT Tue May 2 14:08:05 CST 2017 aarch64 aarch64 aarch64 GNU/Linux

Check Driver

These commands are not mandatory, but you can confirm if the drivers have been loaded during the boot process.

1.Check I2C bus detection

Serializer, deserializer and FPGA i2c addresses can be detected on i2cbus 6

ubuntu@tegra-ubuntu:~$ sudo i2cdetect -r -y 6
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

2. Check if serializer, deserializer, FPGA and ar0144 driver are loaded successfully. You can run use dmesg command to see the drivers were registered

ubuntu@tegra-ubuntu:~$ dmesg | grep "GMSL"
[    4.403599] inscopix_sd 6-0058: GMSL deserializer registered.
[    4.566541] inscopix_sd 6-0040: GMSL serializer registered.

3. Check new video devices files:

ubuntu@tegra-ubuntu:~$ ls /dev/video0 
/dev/video0