PTX kernels in OpenCL

Does anyone know if it is possible to load PTX kernels (not generated by driver, instead hand-written) using clCreateProgramWithBinary or some other method?
Is there documentation on how to do so?

(Note: I had started a thread about this on OpenCL forum as well, but it appears that the OpenCL forum is not frequently visited)

I am interested as well. any news?