08-05-2015
There is usually a BIOS setting for "turn on after power loss", yes. It's a setting in the motherboard itself which you get into via a menu before the OS even boots. This makes it highly system-specific as well, some systems use F10 on boot to get to that menu, some use F2, some use DEL, etc, and where the option is found also varies. You'll have to research and explore.
Unfortunately, since the BIOS settings are very often corrupted and reset to defaults in power loss situations, the BIOS "power on after power loss" setting is very untrustworthy anyway.
There was one model of PC back in 1997 which had a switch on the motherboard to configure behavior after power loss. They're the only computers I've encountered which I could actually trust to do so.
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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