Manual Reference Pages - NVRAM (4)
- non-volatile RAM
To compile this driver into the kernel,
place the following line in your
kernel configuration file:
.Cd device nvram
Alternatively, to load the driver as a
module at boot time, place the following line in
driver provides access to BIOS configuration NVRAM on i386 and amd64
PC motherboard uses a small non-volatile memory to store BIOS settings
which is usually part of its clock chip and sometimes referred as
This driver exposes bytes 14 through 128 of the NVRAM, or a total of
114 bytes, at offset zero of the device file
This driver is useful for cloning machines that shares the same hardware
configuration and need same BIOS setting tweaks.
The BIOS NVRAMs bytes 16 through 31 are checksummed at byte 32.
take care for these checksums.
Backup existing BIOS NVRAM to
dd if=/dev/nvram of=nvram.bin
Restore BIOS NVRAM from
dd if=nvram.bin of=/dev/nvram
device driver first appeared in
.Fx 6.4 .
device driver was written by
.An Peter Wemm .
This manual page was written by
.An Xin LI .
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