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# Cross building for AARCH64
In nnfw, we use both `ARM64` and `AARCH64` on build files such as Makefile, CMakeLists.txt and so on.
- `ARM64`: only for Android
- `AARCH64`: all except for Android
However we use only one term `ARM64` in RootFS. Use `ARM64` if you need a RootFS for `AARCH64`.
## 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 arm64
```
- 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/arm64` folder.
### Prepare RootFS at alternative folder
Use `ROOTFS_DIR` to a full path to prepare at alternative path.
```
ROOTFS_DIR=/home/user/rootfs/arm64-xenial sudo ./tools/cross/build_rootfs.sh arm64
```
### Using proxy
If you need to use proxy server while building the rootfs, use `--setproxy` option.
```
# for example,
sudo ./tools/cross/build_rootfs.sh arm64 --setproxy="1.2.3.4:8080"
# or
sudo ./tools/cross/build_rootfs.sh arm64 --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.
## Cross build for AARCH64
Install cross compilers
```
sudo apt-get install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
```
Build and install ARM Compute Library
```
CROSS_BUILD=1 TARGET_ARCH=aarch64 make acl
```
Mostly you only need once of ACL build. This will build and install to
`Product/(target_arch-os)/out/bin` folder.
- this is required for `AARCH64` on Ubuntu
Give `TARGET_ARCH` variable to set the target architecture
```
CROSS_BUILD=1 TARGET_ARCH=aarch64 make
CROSS_BUILD=1 TARGET_ARCH=aarch64 make install
```
- supports `armv7l` and `aarch64` for now
If you used `ROOTFS_DIR` to prepare in alternative folder,
you should also give this to makefile.
```
CROSS_BUILD=1 ROOTFS_DIR=/home/user/rootfs/arm64-xenial TARGET_ARCH=aarch64 make
CROSS_BUILD=1 ROOTFS_DIR=/home/user/rootfs/arm64-xenial TARGET_ARCH=aarch64 make install
```
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