default or selected kernelversion does not have config value CONFIG_FB_PNX4008_DUM.
Result is shown for kernelversion 6.2.5
Display Update Module support on Philips PNX4008 board
modulename: sdum.ko
configname: CONFIG_FB_PNX4008_DUM
Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Support for frame buffer devices
└─>Display Update Module support on Philips PNX4008 board
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
Say Y here to enable support for PNX4008 Display Update Module (DUM)