Why OpenCL haver specific boards?

@kangchusuk, since all the existing boards with OpenCL support are based on Cyclon V, Stratix V or Arria 10 FPGAs, chance are, other families might no be at all supported by Altera's OpenCL compiler and hence, even if you create a BSP yourself for your own board, you might not be able to use it. If you are planning to use an FPGA that doesn't belong to these three families, you should make sure that FPGA is supported by Altera's OpenCL Compiler. I have not seen anything regarding device support list in the compiler's documentation, so you might have to ask Altera directly to make sure.