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

JEDEC Flash device mapped on Tempustech VMAX SBC301

modulename: vmax301.ko

configname: CONFIG_MTD_VMAX

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Mapping drivers for chip access
└─>JEDEC Flash device mapped on Tempustech VMAX SBC301
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This provides a 'mapping' driver which supports the way in which
the flash chips are connected in the Tempustech VMAX SBC301 Single
Board Computer. More information on the board is available at
<http://www.tempustech.com/>.

source code: