WhyCan Forum(哇酷开发者社区)

sample里的hifb实例，./sample_hifb 
[SAMPLE_HIFB_PANDISPLAY]-210: 1111 file /dev/fb0
[SAMPLE_HIFB_PANDISPLAY]-220: 1111 pstInfo->fd 6
[SAMPLE_HIFB_PANDISPLAY]-230: stVarInfo.xres = 320
[SAMPLE_HIFB_PANDISPLAY]-231: stVarInfo.yres = 240
[SAMPLE_HIFB_PANDISPLAY]-232: stVarInfo.xres_virtual = 320
[SAMPLE_HIFB_PANDISPLAY]-233: stVarInfo.yres_virtual = 240

[SAMPLE_HIFB_PANDISPLAY]-241: 22222 FBIOPUT_SHOW_HIFB failed!

执行函数如下
    if (ioctl(pstInfo->fd, FBIOPUT_SHOW_HIFB, &bShow) < 0)
    {
        SAMPLE_PRT("22222 FBIOPUT_SHOW_HIFB failed!\n");
        return HI_NULL;
    }

有大佬知道这是个啥原因啊， 什么原因导致FBIOPUT_SHOW_HIFB失败呀，谢谢