follow these steps
1. git clone
https://github.com/onyx-intl/toolchain.git to download the toolchain
2. go to imx508 folder. M92 uses imx508 processor.
3. extract the gcc-4.4.4-glibc-2.11.1-multilib-1.0.tar.gz to certain folder. it's the toolchain.
4. extract sdk_imx508.tar.gz to some folder you like. it's the pre-built sdk. Of course, you're able to build sdk by yourself from source code too. You're able to checkout sdk from
https://github.com/onyx-intl/booxsdk.git
now you should be able to develop your apps from M92.