default or selected kernelversion does not have config value CONFIG_DM9000_DEBUGLEVEL.
Result is shown for kernelversion 6.2.5

DM9000 maximum debug level

configname: CONFIG_DM9000_DEBUGLEVEL

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>DM9000 maximum debug level
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
The maximum level of debugging code compiled into the DM9000