default or selected kernelversion does not have config value CONFIG_DE4X5.
Result is shown for kernelversion 6.9.5

Generic DECchip & DIGITAL EtherWORKS PCI/EISA

modulename: de4x5.ko

configname: CONFIG_DE4X5

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Generic DECchip & DIGITAL EtherWORKS PCI/EISA
In linux kernel since version 2.6.12  
This is support for the DIGITAL series of PCI/EISA Ethernet cards.
These include the DE425, DE434, DE435, DE450 and DE500 models. If
you have a network card of this type, say Y. More specific
information is contained in
<file:Documentation/networking/de4x5.txt>.

To compile this driver as a module, choose M here. The module will
be called de4x5.

source code: