NVRAM(4)              OpenBSD Programmer's Manual (AMD64)             NVRAM(4)

NAME
     nvram - driver for reading PC NVRAM contents

SYNOPSIS
     pseudo-device nvram 1

DESCRIPTION
     The 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.  Check-
     sums 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.

FILES
     /dev/nvram

HISTORY
     nvram support was originally included in OpenBSD 3.7.

OpenBSD 4.7                     August 2, 2007                               1
