default or selected kernelversion does not have config value CONFIG_MTD_WRSBC8260.
Result is shown for kernelversion 6.2.5

Map driver for WindRiver PowerQUICC II MPC82xx board

modulename: wr_sbc82xx_flash.ko

configname: CONFIG_MTD_WRSBC8260

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Mapping drivers for chip access
└─>Map driver for WindRiver PowerQUICC II MPC82xx board
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Map driver for WindRiver PowerQUICC II MPC82xx board. Drives
all three flash regions on CS0, CS1 and CS6 if they are configured
correctly by the boot loader.

source code: