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8168 vga output problem

hi, my hardware(hardware designed by ourself)  is 8168 ES2.1, DVRRDK4.0, 


the hdmi, and ypbpr output all ok. now i change the ypbpr to vga output, 
i find some document at the forum, but some error at sys filesystem:

root@dm816x:/# cat /sys/devices/platform/vpss/display3/enabled
1
root@dm816x:/# echo 1 > /sys/devices/platform/vpss/display3/enabled
root@dm816x:/# echo 0 > /sys/devices/platform/vpss/display3/enabled
-sh: echo: write error: Invalid argument
root@dm816x:/#

and the display3/output wirte also failed:
root@dm816x:/# echo component,rgb888,0/0/0/0 > /sys/devices/platform/vpss/display3/output
-sh: echo: write error: Invalid argument
root@dm816x:/#


root@dm816x:/# mount
rootfs on / type rootfs (rw)
2.1.1.18:/home/wyt/rootfs40_1G on / type nfs
(rw,relatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,nolock,proto=tcp,ti
cal_lock=all,addr=2.1.1.18)
devtmpfs on /dev type devtmpfs (rw,relatime,size=116408k,nr_inodes=29102,mode=755)
proc on /proc type proc (rw,relatime)
none on /dev/shm type tmpfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
usbfs on /proc/bus/usb type usbfs (rw,relatime)
tmpfs on /var/volatile type tmpfs (rw,relatime,size=16384k)
tmpfs on /media/ram type tmpfs (rw,relatime,size=16384k)
sysfs on /sys type sysfs (rw,relatime)
root@dm816x:/#
root@dm816x:/#


can give some tips? thanks