default or selected kernelversion does not have config value CONFIG_ROCKETPORT.
Result is shown for kernelversion 6.8.2

Comtrol RocketPort support

modulename: rocket.ko


Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>EISA support
└─>PCI support
└─>Comtrol RocketPort support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This driver supports Comtrol RocketPort and RocketModem PCI boards.
These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
modems. For information about the RocketPort/RocketModem boards
and this driver read <file:Documentation/driver-api/serial/rocket.rst>.

To compile this driver as a module, choose M here: the
module will be called rocket.

If you want to compile this driver into the kernel, say Y here. If
you don't have a Comtrol RocketPort/RocketModem card installed, say N.

source code: