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  #include <nuttx/video/fb.h>

  #ifdef CONFIG_VIDEO_FB
    /* Initialize and register the simulated framebuffer driver */

    ret = fb_register(0, 0);
    if (ret < 0)
      {
        syslog(LOG_ERR, "ERROR: fb_register() failed: %d\n", ret);
      }
  #endif

  FAR void *fbmem;

  fbmem = mmap(NULL, fblen, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FILE, fd, 0);
  if (state.fbmem == MAP_FAILED)
    {
      /* Handle failure */
      ...
    }

  printf("Mapped FB: %p\n", fbmem);