default or selected kernelversion does not have config value CONFIG_FB_NUC900.
Result is shown for kernelversion 6.9.9

NUC900 LCD framebuffer support

modulename: nuc900fb.ko

configname: CONFIG_FB_NUC900

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>Support for frame buffer devices
└─>NUC900 LCD framebuffer support
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Frame buffer driver for the built-in LCD controller in the Nuvoton
NUC900 processor

source code: