NVRAM(4) BSD Kernel Interfaces Manual NVRAM(4)NAME
nvram -- non-volatile RAM
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device nvram
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
nvram_load="YES"
DESCRIPTION
The nvram driver provides access to BIOS configuration NVRAM on i386 and amd64 systems.
PC motherboard uses a small non-volatile memory to store BIOS settings which is usually part of its clock chip and sometimes referred as
``CMOS SRAM''. This driver exposes bytes 14 through 128 of the NVRAM, or a total of 114 bytes, at offset zero of the device file /dev/nvram.
This driver is useful for cloning machines that shares the same hardware configuration and need same BIOS setting tweaks.
IMPLEMENTATION NOTES
The BIOS NVRAM's bytes 16 through 31 are checksummed at byte 32. This driver does not take care for these checksums.
EXAMPLES
Backup existing BIOS NVRAM to nvram.bin:
dd if=/dev/nvram of=nvram.bin
Restore BIOS NVRAM from nvram.bin:
dd if=nvram.bin of=/dev/nvram
SEE ALSO dd(1)HISTORY
The nvram device driver first appeared in FreeBSD 6.4.
AUTHORS
The nvram device driver was written by Peter Wemm. This manual page was written by Xin LI.
BSD February 8, 2010 BSD
Check Out this Related Man Page
cat_nvram(8) NVRAM WakeUp cat_nvram(8)NAME
cat_nvram - Dumps the contents of nvram to STDOUT.
SYNOPSIS
cat_nvram upper_method
DESCRIPTION
cat_nvram is a helper program from the package nvram-wakeup. It dumps the contents of nvram to stdout using direct I/O functions.
OPTIONS
upper_method
specifies the method which should be used to access the upper part of NVRAM.
See nvram-wakeup.conf(5) for a list of possible values.
SEE ALSO nvram-wakeup(8), nvram-wakeup.conf(5)HOMEPAGE
http://sf.net/projects/nvram-wakeup/
AUTHOR
Written by Sergei Haller <Sergei.Haller@math.uni-giessen.de>.
REPORTING BUGS
Report bugs at the bug tracking system (see HOMEPAGE) or on the mailing list nvram-wakeup-devel@lists.sourceforge.net
COPYRIGHT
Copyright (C) 2001-2004 Sergei Haller.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linux Jul 07 2004 cat_nvram(8)
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