nVidia Jetson

Embedded AI Modules: NVIDIA's Jetson TX2, Nano & AGX Xavier | Arrow.com

Jetson Nano

NVIDIA Jetson Nano Developer Kit | NVIDIA Developer
The Power of Modern AI to Millions of Devices | NVIDIA Jetson Nano
Jetson Nano - eLinux.org

NVIDIA Jetson Nano .img pre-configured for Deep Learning and Computer Vision - PyImageSearch
How to configure your NVIDIA Jetson Nano for Computer Vision and Deep Learning - PyImageSearch

Jetson TX2

High Performance AI at the Edge | NVIDIA Jetson TX2
Harness AI at the Edge with the Jetson TX2 Developer Kit | NVIDIA Developer
NVIDIA Announces Jetson TX2: Parker Comes To NVIDIA’s Embedded System Kit - Print View
Jetson TX2 - eLinux.org

Jetson Xavier

World’s Smallest AI Supercomputer: Jetson Xavier NX | NVIDIA
Jetson Xavier NX | NVIDIA Developer
NVIDIA Gives Jetson AGX Xavier a Trim, Announces Nano-Sized Jetson Xavier NX - Print View
NVIDIA 推出 Jetson Xavier NX 輕量 AI 電腦，效能較 Jetson Nano 提升 4 倍 | T 客邦

Cross Compile Qt5

There are two major steps:

build Qt for a given nVidia Jetson TX2 device on Linux host.
build the Qt application using the above compiled Qt libs.

Jetson TX2 os image.

NVIDIA JetPack Software

frankchen@:jetson-tx2$ ll /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/
total 96
drwxr-xr-x  21 root      root       4096 Jun 18 16:36 ./
drwxr-xr-x   6 frankchen frankchen  4096 Mar 13 15:40 ../
drwxr-xr-x   2 root      root       4096 Feb 20 15:22 bin/
drwxr-xr-x   3 root      root       4096 Jun 18 16:37 boot/
drwxr-xr-x   2 root      root       4096 May 18  2018 dev/
drwxr-xr-x 135 root      root      12288 Jun 18 16:37 etc/
drwxr-xr-x   2 root      root       4096 Apr 24  2018 home/
drwxr-xr-x  21 root      root       4096 Jun 18 16:37 lib/
drwxr-xr-x   2 root      root       4096 Aug  6  2018 media/
drwxr-xr-x   2 root      root       4096 Apr 27  2018 mnt/
drwxr-xr-x   3 root      root       4096 Jun 18 16:37 opt/
drwxr-xr-x   2 root      root       4096 Apr 24  2018 proc/
-rw-r--r--   1 frankchen frankchen    62 Mar 13 15:40 README.txt
drwx------   2 root      root       4096 Apr 27  2018 root/
drwxr-xr-x  16 root      root       4096 Jan  4 09:20 run/
drwxr-xr-x   2 root      root       4096 Feb 20 15:22 sbin/
drwxr-xr-x   2 root      root       4096 May 11  2018 snap/
drwxr-xr-x   2 root      root       4096 Apr 27  2018 srv/
drwxr-xr-x   2 root      root       4096 Apr 24  2018 sys/
drwxrwxrwt   2 root      root       4096 Feb 21 19:52 tmp/
drwxr-xr-x  11 root      root       4096 May 21  2018 usr/
drwxr-xr-x  15 root      root       4096 Jun 18 16:37 var/

toolchains for Jetson TX2 on linux.

go to Linaro Download Center, find product with title 5.5.0-2017.10-x86_64_arrch64.

frankchen@:jetson-tx2$ tar -xvf ~/Downloads/gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu.tar.xz
frankchen@:jetson-tx2$ mv gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/ toolchains/
frankchen@:jetson-tx2$ ll toolchains/
total 16
drwxr-xr-x 4 frankchen frankchen 4096 Jun 20 17:13 ./
drwxr-xr-x 4 frankchen frankchen 4096 Jun 20 17:01 ../
drwxr-xr-x 8 frankchen frankchen 4096 Jan 28  2017 gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/
drwxr-xr-x 8 frankchen frankchen 4096 Jan 23 04:22 gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu/

symbolic link tool,

frankchen@:jetson-tx2$ wget https://raw.githubusercontent.com/riscv/riscv-poky/master/scripts/sysroot-relativelinks.py
frankchen@:jetson-tx2$ chmod +x ./sysroot-relativelinks.py
frankchen@:jetson-tx2$ sudo ./sysroot-relativelinks.py $TX2_SYSROOT

Note:

# Ubuntu 18.04, the toolchain maybe have errors below
frankchen@:jetson-tx2$ ./toolchains/bin/aarch64-unknown-linux-gnu-gcc
aarch64-unknown-linux-gnu-gcc: loadlocale.c:129: _nl_intern_locale_data: Assertion ''cnt < (sizeof (_nl_value_type_LC_TIME) / sizeof (_nl_value_type_LC_TIME[0]))'' failed.
Aborted (core dumped)
# Fix
frankchen@:jetson-tx2$ export LC_ALL=C
frankchen@:jetson-tx2$ ./toolchains/bin/aarch64-unknown-linux-gnu-gcc
aarch64-unknown-linux-gnu-gcc: fatal error: no input files
compilation terminated.
# Sysroot for the toolchain
frankchen@:jetson-tx2$ ./toolchains/bin/aarch64-unknown-linux-gnu-gcc --print-sysroot
/home/frankchen/Documents/jetson-tx2/toolchains/bin/../aarch64-unknown-linux-gnu/sysroot

configure to build Qt for nvidia Jetson TX2 on linux host
```
# cd <QT_SRC>
frankchen@:jetson-tx2$ cd ~/Qt/5.12.3/Src/

# set ENV
frankchen@:jetson-tx2$ export TX2_SYSROOT=/home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs
frankchen@:jetson-tx2$ export TX2_TOOLCHAIN=/home/frankchen/Documents/jetson-tx2/toolchains/gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-

# configure
frankchen@:Src$ ./configure -opensource -confirm-license \
    -release \
    -device linux-jetson-tx2-g++ \
    -device-option CROSS_COMPILE=$TX2_TOOLCHAIN \
    -sysroot $TX2_SYSROOT \
    -extprefix ~/Documents/jetson-tx2/qt5-jetson-tx2 \
    -nomake tests -nomake examples \
    -skip qtwayland -skip qtlocation -skip qtscript
```
Note:

-prefix, -extprefix, and -hostprefix control the intended destination directory of the Qt build. In the above example the ARM build of Qt is expected to be placed in /usr/local/qt5 on the target device. Note that running make install does not deploy anything to the device. Instead, the install step targets the directory specified by extprefix which defaults to sysroot + prefix and is therefore optional. However, in many cases "polluting" the sysroot is not desirable and thus specifying -extprefix becomes important. Finally, -hostprefix allows separating host tools like qmake, rcc, uic from the binaries for the target. When given, such tools will be installed under the specified directory instead of extprefix.

make build

frankchen@:Src$ make clean
frankchen@:Src$ make -j4
frankchen@:Src$ make install
# the Qt libs will be installed into  `extprefix` folder
frankchen@:Src$ ll ~/Documents/jetson-tx2/qt5-jetson-tx2/
total 64
drwxr-xr-x 10 frankchen frankchen  4096 Jun 20 19:20 ./
drwxr-xr-x  4 frankchen frankchen  4096 Jun 20 17:01 ../
drwxr-xr-x  2 frankchen frankchen  4096 Jun 20 19:20 bin/
drwxr-xr-x  3 frankchen frankchen  4096 Jun 20 14:11 doc/
drwxr-xr-x 76 frankchen frankchen  4096 Jun 20 19:20 include/
drwxr-xr-x  4 frankchen frankchen 20480 Jun 20 19:20 lib/
drwxr-xr-x 79 frankchen frankchen  4096 Jun 20 19:19 mkspecs/
drwxr-xr-x 22 frankchen frankchen  4096 Jun 20 19:20 plugins/
drwxr-xr-x 23 frankchen frankchen  4096 Jun 20 19:20 qml/
drwxr-xr-x  2 frankchen frankchen 12288 Jun 20 19:20 translations/

Problems:

errors when building libwebp,

frankchen@:Src$ make
make[5]: Entering directory '/home/frankchen/Qt/5.12.3/Src/qtimageformats/src/plugins/imageformats/webp'
/home/frankchen/Documents/jetson-tx2/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -c -pipe -mtune=cortex-a57.cortex-a53 -march=armv8-a --sysroot=/home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs -O2 -std=gnu11 -fvisibility=hidden -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_GUI_LIB -DQT_CORE_LIB -I. -I../../../3rdparty/libwebp -I../../../3rdparty/libwebp/src -I../../../3rdparty/libwebp/src/dec -I../../../3rdparty/libwebp/src/enc -I../../../3rdparty/libwebp/src/dsp -I../../../3rdparty/libwebp/src/mux -I../../../3rdparty/libwebp/src/utils -I../../../3rdparty/libwebp/src/webp -I/home/frankchen/Qt/5.12.3/Src/qtbase/include -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtGui -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtCore -I.moc -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/libdrm -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/aarch64-linux-gnu -I/home/frankchen/Qt/5.12.3/Src/qtbase/mkspecs/devices/linux-jetson-tx2-g++ -o .obj/dec_neon.o ../../../3rdparty/libwebp/src/dsp/dec_neon.c
../../../3rdparty/libwebp/src/dsp/dec_neon.c: In function 'SimpleHFilter16_NEON':
../../../3rdparty/libwebp/src/dsp/dec_neon.c:531:1: internal compiler error: in record_operand_use, at regrename.c:220
}
^

# enter into the folder to better tackle this issue
frankchen@:Src$ cd /home/frankchen/Qt/5.12.3/Src/qtimageformats/src/plugins/imageformats/webp
frankchen@:webp$ make clean
frankchen@:webp$ /home/frankchen/Documents/jetson-tx2/toolchains/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -c -pipe -mtune=cortex-a57.cortex-a53 -march=armv8-a --sysroot=/home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs -O2 -std=gnu11 -fvisibility=hidden -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_GUI_LIB -DQT_CORE_LIB -I. -I../../../3rdparty/libwebp -I../../../3rdparty/libwebp/src -I../../../3rdparty/libwebp/src/dec -I../../../3rdparty/libwebp/src/enc -I../../../3rdparty/libwebp/src/dsp -I../../../3rdparty/libwebp/src/mux -I../../../3rdparty/libwebp/src/utils -I../../../3rdparty/libwebp/src/webp -I/home/frankchen/Qt/5.12.3/Src/qtbase/include -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtGui -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtCore -I.moc -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/libdrm -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/aarch64-linux-gnu -I/home/frankchen/Qt/5.12.3/Src/qtbase/mkspecs/devices/linux-jetson-tx2-g++ -o .obj/dec_neon.o ../../../3rdparty/libwebp/src/dsp/dec_neon.c
../../../3rdparty/libwebp/src/dsp/dec_neon.c: In function 'SimpleHFilter16_NEON':
../../../3rdparty/libwebp/src/dsp/dec_neon.c:531:1: internal compiler error: in record_operand_use, at regrename.c:220
}
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


# possible solution, using the linaro toolchain with new version(5.5.0-2017.10) maybe fix the bug
frankchen@:webp$ make clean
frankchen@:webp$ /home/frankchen/Documents/jetson-tx2/toolchains/gcc-linaro-5.5.0-2017.10-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -c -pipe -mtune=cortex-a57.cortex-a53 -march=armv8-a --sysroot=/home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs -O2 -std=gnu11 -fvisibility=hidden -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_GUI_LIB -DQT_CORE_LIB -I. -I../../../3rdparty/libwebp -I../../../3rdparty/libwebp/src -I../../../3rdparty/libwebp/src/dec -I../../../3rdparty/libwebp/src/enc -I../../../3rdparty/libwebp/src/dsp -I../../../3rdparty/libwebp/src/mux -I../../../3rdparty/libwebp/src/utils -I../../../3rdparty/libwebp/src/webp -I/home/frankchen/Qt/5.12.3/Src/qtbase/include -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtGui -I/home/frankchen/Qt/5.12.3/Src/qtbase/include/QtCore -I.moc -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/libdrm -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include -isystem /home/frankchen/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/rootfs/usr/include/aarch64-linux-gnu -I/home/frankchen/Qt/5.12.3/Src/qtbase/mkspecs/devices/linux-jetson-tx2-g++ -o .obj/dec_neon.o ../../../3rdparty/libwebp/src/dsp/dec_neon.c

Compile Qt program for `nVidia Jetson TX2` on Linux host(advanced example)