If you insert a memory device and it isn't recognized (no special files created), use the prtconf command.
Run the prtconf -D command to display the configuration recognized by the system.
A recognized device will appear in the prtconf output. For example:
# prtconf -D . . . pcic, instance #0 (driver name: pcic) . . . memory, instance #0 (driver name: pcmem) pcram, instance #0 (driver name: pcram)
If your memory device does not appear at the end of the prtconf output, it is not supported and cannot be used with the pcram device driver.