How to cross-compile for MIPS?

I have a DVB receiver (set-top box) similar like Dreambox and it ha开发者_开发知识库s MIPS cpu

It has embedded Linux and I can connect to it with telnet

Question is how to compile simple "Hello World" application in C? Where to get toolchain, SDK?

You should use Codescape SDK.

http://www.linux-mips.org/wiki/Toolchains

There you have some prebuilt cross compilers, or the instruction to build GCC as a cross compiler.