The SunPCTM 4.1 package and then necessary patches (102924) were added. When trying to run sunpc_install, the user got the above error message. prtconf(1M) shows that the driver is not attached, and modinfo(1M) displays 4 modules.
After removing the package, backing out the patch, and reinstalling, the user still received the same error message.
SunPC had previously been installed on the system. When removing the package with the pkgrm(1M) command, not all components were removed, because pkgrm(1M) is not aware of changes made by the sunpc_install script.
To resolve this problem it is necessary to remove sections in the files pertaining to SunPC: /etc/devlink.tab, /etc/driver_aliases, and /etc/rc2.d/S10storekernname, and then reinstall the package.