VM using Ubuntu 20.04LTS
sudo apt update
sudo apt upgrade

Install SSHFS to remote into mount from the e310
sudo apt-get install sshfs

Get the e310 sdcard image and SDK for UHD 4.0
https://files.ettus.com/binaries/cache/e3xx/meta-ettus-v4.0.0.0/e3xx_e310_sg3_sdimg_default-v4.0.0.0.zip
https://files.ettus.com/binaries/cache/e3xx/meta-ettus-v4.0.0.0/e3xx_e310_sdk_default-v4.0.0.0.zip

Create the development directories
mkdir rfnoc
cd rfnoc
mkdir e300
mkdir oe
mkdir src

Install the SDK:
bash ./e310_sg3-oecore-x86_64-cortexa9t2hf-neon-toolchain-nodistro.0.sh
Enter target directory for SDK (default: /usr/local/oecore-x86_64): ~/rfnoc/oe
You are about to install the SDK to "/home/mgarrett/rfnoc/oe". Proceed [Y/n]? y

Site:
https://files.ettus.com/manual/page_build_guide.html

Install Dependiencies:
udo apt-get install libboost-all-dev libusb-1.0-0-dev doxygen python3-docutils python3-mako python3-numpy python3-requests python3-ruamel.yaml python3-setuptools cmake build-essential

Install GIT:
sudo apt install git

git clone https://github.com/EttusResearch/uhd.git

cd uhd/host
mkdir build-host
cd build-host
cmake ../
make
sudo make install

Load the USRP Images
cd /usr/local/bin
sudo ./uhd_images_downloader

set the USB Permissions
cd /usr/local/lib/uhd/utils
sudo cp uhd-usrp.rules /etc/udev/rules.d/
sudo udevadm control --reload-rules
sudo udevadm trigger



Test installation
cd ~
uhd_usrp_probe
finds e310 on local ethernet port

Snapshot VM

Cross compile UHD
cd ~/rfnoc/oe
source./environment-setup-cortexa9t2hf-neon-oe-linux-gnueabi
echo $CC
arm-oe-linux-gnueabi-gcc -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/mgarrett/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi

cd ~/rfnoc/src/uhd/host
mkdir build-arm
cd build-arm

cmake -DCMAKE_TOOLCHAIN_FILE=../host/cmake/Toolchains/oe-sdk_cross.cmake -DCMAKE_INSTALL_PREFIX=/usr -DENABLE_E300=ON -DENABLE_GPSD=ON -DENABLE_RFNOC=ON ..

make 

make install DESTDIR=~/rfnoc/e300
make install DESTDIR=~/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi/

cd ~/rfnoc/e300
touch setup.env
nano setup.env

LOCALPREFIX=~/newinstall/usr
export PATH=$LOCALPREFIX/bin:$PATH
export LD_LOAD_LIBRARY=$LOCALPREFIX/lib:$LD_LOAD_LIBRARY
export LD_LIBRARY_PATH=$LOCALPREFIX/lib:$LD_LIBRARY_PATH
export PYTHONPATH=$LOCALPREFIX/lib/python2.7/site-packages:$PYTHONPATH
export PKG_CONFIG_PATH=$LOCALPREFIX/lib/pkgconfig:$PKG_CONFIG_PATH
export GRC_BLOCKS_PATH=$LOCALPREFIX/share/gnuradio/grc/blocks:$GRC_BLOCKS_PATH
export UHD_RFNOC_DIR=$LOCALPREFIX/share/uhd/rfnoc/
export UHD_IMAGES_DIR=$LOCALPREFIX/share/uhd/images

Save this file

Copy the e3xx images to the local directory

mkdir -p ~/rfnoc/e300/usr/share/uhd/images
cd ~/rfnoc/e300/usr/share/uhd/images
cp -Rv /usr/local/share/uhd/images/usrp_e310_sg3_fpga* .
cp -Rv /usr/local/share/uhd/images/usrp_e310_sg3_idle_fpga* .

Mount and test the e300 directory

ping 192.168.20.2

sudo apt -y install openssh-server

ssh into the e300

ssh root@192.168.20.2

On the e300
mkdir -p ~/newinstall
sshfs mgarrett@192.168.20.8:/home/mgarrett/rfnoc/e300 newinstall/
cd /newinstall
source ./setup.env (set patsh to the mounted sdk drive)
cd ~/newinstall/usr/bin
uhd_usrp_probe

Shows the UHD device and FPGA information, executing binary from sdk 

UHD is installed

Install Volk Host and Cross compiled version

Reference: https://wiki.gnuradio.org/index.php/InstallingGR
Reference: https://wiki.gnuradio.org/index.php/UbuntuInstall#Focal_Fossa_.2820.04.29

Install Dependencies:

sudo apt install git cmake g++ libboost-all-dev libgmp-dev swig python3-numpy \
python3-mako python3-sphinx python3-lxml doxygen libfftw3-dev \
libsdl1.2-dev libgsl-dev libqwt-qt5-dev libqt5opengl5-dev python3-pyqt5 \
liblog4cpp5-dev libzmq3-dev python3-yaml python3-click python3-click-plugins \
python3-zmq python3-scipy python3-gi python3-gi-cairo gobject-introspection gir1.2-gtk-3.0

Install Volk:
https://wiki.gnuradio.org/index.php/InstallingGR

cd ~/rfnoc/src
git clone --recursive https://github.com/gnuradio/volk.git
cd volk
--> Install the master branch
mkdir build-host
cd build-host
cmake -DCMAKE_BUILD_TYPE=Release -DPYTHON_EXECUTABLE=/usr/bin/python3 ../
make
make test
Install volk on the host
sudo make install 

Cross Compile Volk:

cd ~/rfnoc/oe
source ./environment-setup-cortexa9t2hf-neon-oe-linux-gnueabi
echo $CC

arm-oe-linux-gnueabi-gcc -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/mgarrett/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi

cd ~/rfnoc/src/volk$
mkdir build-arm

----> Critical step in compiling volk for the e3xx
cmake -Wno-dev -DCMAKE_TOOLCHAIN_FILE=~/rfnoc/src/volk/cmake/Toolchains/oe-sdk_cross.cmake -DCMAKE_CXX_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9" -DCMAKE_C_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9" -DCMAKE_ASM_FLAGS:STRING="-march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -g" -DENABLE_DOXYGEN=OFF -DCMAKE_INSTALL_PREFIX=/usr ../

Install the built volk files into the sdk
make install DESTDIR=~/rfnoc/e300
make install DESTDIR=~/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi/

Reference: Reference: https://wiki.gnuradio.org/index.php/InstallingGR
Reference: https://kb.ettus.com/Software_Development_on_the_E3xx_USRP_-_Building_RFNoC_UHD_/_GNU_Radio_/_gr-ettus_from_Source

---> Make sure your not in the oe ARM target environement!! echo $CC should be x86 target or none
Install and compile gnuradio on the host
cd ~rfnoc/src
git clone https://github.com/gnuradio/gnuradio.git
cd gnuradio
git checkout maint-3.8
mkdir build-host
cd build-host
cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_INTERNAL_VOLK=OFF DPYTHON_EXECUTABLE=/usr/bin/python3 ../
make
sudo make install

Install gr-ettus
sudo ldconfig

cd ~/rfnoc/src 
git clone https://github.com/EttusResearch/gr-ettus.git
cd gr-ettus
git checkout maint-3.8-uhd4.0
mkdir build-host
cd build-host
cmake ..
make -j4
sudo make install
sudo ldconfig

Cross Compile volk, gnuradio and gr ettus and install into the e300 mount devlopment directory and the oe sdk

cd ~/rfnoc/oe
source./environment-setup-cortexa9t2hf-neon-oe-linux-gnueabi
echo $CC
arm-oe-linux-gnueabi-gcc -mthumb -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/mgarrett/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi

We already built and installed volk up above...

cd ~/rfnoc/src/gnuradio
mkdir build-arm
cd build-arm

cmake -Wno-dev -DCMAKE_TOOLCHAIN_FILE=~/rfnoc/src/gnuradio/cmake/Toolchains/oe-sdk_cross.cmake -DENABLE_INTERNAL_VOLK=OFF -DENABLE_GR_WXGUI=OFF -DENABLE_GR_VOCODER=OFF -DENABLE_GR_DTV=OFF -DENABLE_GR_ATSC=OFF -DENABLE_DOXYGEN=OFF -DCMAKE_INSTALL_PREFIX=/usr ../

make

make install DESTDIR=~/rfnoc/e300
make install DESTDIR=~/rfnoc/oe/sysroots/cortexa9t2hf-neon-oe-linux-gnueabi/

Cross compile gr-ettus

cd ~/rfnoc/src/gr-ettus
mkdir build-arm
cd build-arm
cmake -DCMAKE_TOOLCHAIN_FILE=~/rfnoc/src/gnuradio/cmake/Toolchains/oe-sdk_cross.cmake -DCMAKE_INSTALL_PREFIX=/usr ..

>>>> Error here <<<<<



Refernces:
https://kb.ettus.com/Software_Development_on_the_E3xx_USRP_-_Building_RFNoC_UHD_/_GNU_Radio_/_gr-ettus_from_Source
https://files.ettus.com/manual/page_transport.html
https://files.ettus.com/manual/page_usrp_e3xx.html#e3xx_software_dev_sdkusage
https://wiki.gnuradio.org/index.php/UbuntuInstall#Focal_Fossa_.2820.04.29