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diff --git a/docs/nnfw/howto/CrossBuildForArm.md b/docs/nnfw/howto/CrossBuildForArm.md new file mode 100644 index 000000000..110dde861 --- /dev/null +++ b/docs/nnfw/howto/CrossBuildForArm.md @@ -0,0 +1,129 @@ +# Cross building for ARM + +## Prepare Ubuntu RootFS + +Install required packages + +``` +sudo apt-get install qemu qemu-user-static binfmt-support debootstrap +``` + +Use `build_rootfs.sh` script to prepare Root File System. You should have `sudo` + +``` +sudo ./tools/cross/build_rootfs.sh arm +``` +- supports `arm`(default) and `arm64` architecutre for now +- supports `xenial`(default) and `trusty` release + +To see the options, +``` +./tools/cross/build_rootfs.sh -h +``` + +RootFS will be prepared at `tools/cross/rootfs/arm` folder. + +### Prepare RootFS at alternative folder + +Use `ROOTFS_DIR` to a full path to prepare at alternative path. + +``` +ROOTFS_DIR=/home/user/rootfs/arm-xenial sudo ./tools/cross/build_rootfs.sh arm +``` + +### Using proxy + +If you need to use proxy server while building the rootfs, use `--setproxy` option. + +``` +# for example, +sudo ./tools/cross/build_rootfs.sh arm --setproxy="1.2.3.4:8080" +# or +sudo ./tools/cross/build_rootfs.sh arm --setproxy="proxy.server.com:8888" +``` + +This will put `apt` proxy settings in `rootfs/etc/apt/apt.conf.d/90proxy` file +for `http`, `https` and `ftp` protocol. + +## Install ARM Cross Toolchain + +We recommend you have g++ >= 6 installed on your system because NN generated tests require it. + +- On Ubuntu 16.04 or older, follow the next steps: + +``` +cd ~/your/path +wget https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/arm-linux-gnueabihf/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf.tar.xz +tar xvf gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf.tar.xz +echo 'PATH=~/your/path/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf/bin:$PATH' >> ~/.bashrc +``` + +- On Ubuntu 18.04 LTS, you can install using `apt-get`. +Choose g++ version whatever you prefer: 6, 7 or 8. + +``` +sudo apt-get install g++-{6,7,8}-arm-linux-gnueabihf +``` + +Make sure you get `libstdc++.so` updated on your target with your new toolchain's corresponding one. + +For example, if you installed gcc-linaro-7.2.1-2017.11 above, do + +``` +wget https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/arm-linux-gnueabihf/runtime-gcc-linaro-7.2.1-2017.11-arm-linux-gnueabihf.tar.xz +tar xvf runtime-gcc-linaro-7.2.1-2017.11-arm-linux-gnueabihf.tar.xz +``` + +Then, copy `libstdc++.so.6.0.24` into `/usr/lib/arm-linux-gnueabihf`, and update symbolic links on your device. + +## Build and install ARM Compute Library + +Mostly you only need once of ACL build. + +ACL will be automatically installed in `externals/acl` when you build nnfw without any changes. + +You can check ACL source information in `cmake/packages/ARMComputeSourceConfig.cmake` + +## Build nnfw + +Give `TARGET_ARCH` variable to set the target architecture. + +If you used `ROOTFS_DIR` to prepare in alternative folder, you should also give this to makefile. + +``` +CROSS_BUILD=1 TARGET_ARCH=armv7l make all install + +# If ROOTFS_DIR is in alternative folder +ROOTFS_DIR=/path/to/your/rootfs/arm \ +CROSS_BUILD=1 TARGET_ARCH=armv7l make all install +``` + +You can also omit the `CROSS_BUILD=1` option if you explicitly pass `ROOTFS_DIR`. In that case, if +the `TARGET_ARCH` are differs from the hostarchitecture, the make script automatically applies +`CROSS_BUILD=1`. So, if you set `ROOTFS_DIR` as an environment variable, you can simply perform +normal build and cross build as follows. + +``` +export ROOTFS_DIR = xxx +... +make all install # do normal build +TARGET_ARCH = armv7l make all install # do cross build +``` + +If you want to build neurun, you should switch on `BUILD_NEURUN` option in `cmake/CfgOptionFlags.cmake` +``` +option(BUILD_NEURUN "Build neurun" ON) +``` + +## Run test +- PureACL +``` + ./tests/scripts/test_driver.sh --artifactpath=. +``` + +- neurun +``` + ./tests/scripts/test_driver.sh --artifactpath=. \ + --ldlibrarypath=Product/out/lib/neurun:Product/out/lib \ + --frameworktest_list_file=tests/scripts/neurun_frameworktest_list.armv7l.acl_cl.txt +``` |