default or selected kernelversion does not have config value CONFIG_MTD_DBOX2.
Result is shown for kernelversion 6.2.5

CFI Flash device mapped on D-Box2

modulename: dbox2-flash.ko

configname: CONFIG_MTD_DBOX2

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Mapping drivers for chip access
└─>CFI Flash device mapped on D-Box2
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables access routines for the flash chips on the Nokia/Sagem
D-Box 2 board. If you have one of these boards and would like to use
the flash chips on it, say 'Y'.

source code:
depends
CONFIG_DBOX2
CONFIG_MTD
CONFIG_MTD_CFI_AMDSTD
CONFIG_MTD_CFI_INTELEXT
CONFIG_MTD_CFI_INTELSTD