怎么加bootargs命令到代码中去

怎样加bootargs命令到代码中去
在pandaboard上想实现双屏显示，LCD和HDMI同时显示，目前我的做法是先将LCD点亮，然后通过ADB SHELL，用命令再点亮HDMI，命令如下：
#Setting fb1 to null: 
echo "" > /sys/class/graphics/fb1/overlays

#Setting fb0 to overlay0 and overlay1: 
echo "0,1" > /sys/class/graphics/fb0/overlays

#Enabling overlay0 and overlay1: 
echo "1" > /sys/devices/platform/omapdss/overlay0/enabled
echo "1" > /sys/devices/platform/omapdss/overlay1/enabled

#Setting overlay0 to 2LCD and overlay1 to hdmi
echo "0" > /sys/devices/platform/omapdss/overlay0/enabled
echo "2lcd" > /sys/devices/platform/omapdss/overlay0/manager
echo "1" > /sys/devices/platform/omapdss/overlay0/enabled

echo "0" > /sys/devices/platform/omapdss/overlay1/enabled
echo "tv" > /sys/devices/platform/omapdss/overlay1/manager
echo "1" > /sys/devices/platform/omapdss/overlay1/enabled

#Enable LCD and 2LCD 
echo "1" > /sys/devices/platform/omapdss/display0/enabled
echo "1" > /sys/devices/platform/omapdss/display1/enabled

这样很麻烦，不知道怎样将这些命令加到代码中去，是否是应该加到U-BOOT中去。 哪位高手了解，希望帮忙。谢谢！

------解决方案--------------------
写到init.rc中去