I'm study cuda 5.5 but i don't have any Nvidia GPU. In old version of nvcc have a flag --multicore to compile cuda code for CPU. In the new version of nvcc, what's is the option?? I'm working on Linux.
Answer
CUDA toolkits since at least CUDA 4.0 have not supported an ability to run cuda code without a GPU.
If you simply want to compile code, refer to this question.
If you want to run CUDA codes compiled with CUDA 5.5, you will need a CUDA capable GPU.
If you're willing to use older CUDA toolkits, you could install one of the various emulators, such as this one.
Or you could install a very old (e.g. ~ CUDA 3.0) cuda toolkit that had the ability to run CUDA codes on the CPU.