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Linux/PROCESSOR-SDK-AM335x:根文件移植设备文件缺失

使用am3354芯片的自制板,使用开发包版本为PROCESSOR-SDK-LINUX-AM335X  06_03_00_106。

当根文件使用arago-base-tisdk-image、tisdk-rootfs-image时,上电可在系统查到在/dev中存在input文件夹,文件夹中有touchscreen0等文件,且输入

root@am335x-evm:~# cat /proc/bus/input/devices
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="ti-tsc"
P: Phys=
S: Sysfs=/devices/platform/ocp/44e0d000.tscadc/TI-am335x-tsc.0.auto/input/input0
U: Uniq=
H: Handlers=event0
B: PROP=0
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=1000003

但根文件使用arago-tiny-image或其他制作的根文件时,

上电在/dev中无input文件夹,且输入cat /proc/bus/input/devices无任何信息,具体如下:

root@am335x:~# cat /dev/input/touchscreen0
cat: can't open '/dev/input/touchscreen0': No such file or directory
root@am335x:~# cat /proc/bus/input/devices
root@am335x:~#

 

请问这个根文件系统arago-tiny-image如何才能配置成arago-base-tisdk-imag般存在input文件?