The Digi device driver software can be removed from the kernel by using custom. The Development Kit is not required, although the link kit must be installed.
When prompted to remove Digi One RealPort or PortServer entries from /etc/ttytype, enter <y> to remove the entries. Enter <n> to preserve the entries.
When prompted to boot the new kernel by default, enter <y> for the new kernel to boot by default. Enter <n> if there is a specific reason for this new kernel not to boot by default.
When prompted to rebuild the kernel environment, enter <y>.
shutdown -y -g0