driver for reading PC NVRAM
pseudo-device nvram 1
nvram device provides read-only access
to the non-volatile memory contained in the MC146818 real-time clock.
This data is provided as a seekable character device, /dev/nvram. Checksums of the NVRAM contents are calculated over bytes 2 to 31 and stored in byte 32. A valid checksum is required for the driver to initialize.
nvram support was originally included in