Is there any document which describes the installation of Node.js on Router c819?
C819 is using a PowerPC processor with limited resources, for the application development, it is recommended to use C/C++ or Python for C819.
For C/C++, C819 IOx SDK provides the related toolchain and scripts to compile, build and package.
For Python, C819 IOx provides the support for both Python 2 and Python 3.
And theoretically speaking, it is possible to install Java and Node.js on C819. You may download Java for PPC from "Java SE Embedded - Downloads | Oracle Technology Network | Oracle", and Node.js for PPC from "IBM developerWorks : IBM SDKfor Node.js". Copy the related binaries and libraries to /usr/lib, /usr/bin or other specific folders before the ova packaging (see 819-IOx-SDK-Cookbook.docx for details).
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