default or selected kernelversion does not have config value CONFIG_BFIN_TX_DESC_NUM.
Result is shown for kernelversion 6.7-rc3

Number of transmit buffer packets

configname: CONFIG_BFIN_TX_DESC_NUM

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Number of transmit buffer packets
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Set the number of buffer packets used in driver.