BIOS 수정하는 방법?

/dev/nvram support
CONFIG_NVRAM
If you say Y here and create a character special file /dev/nvram
with major number 10 and minor number 144 using mknod ("man mknod"),
you get read and write access to the extra bytes of non-volatile
memory in the real time clock (RTC), which is contained in every PC
and most Ataris. The actual number of bytes varies, depending on the
nvram in the system, but is usually 114 (128-14 for the RTC).

This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
on Ataris. /dev/nvram may be used to view settings there, or to
change them (with some utility). It could also be used to frequently
save a few bits of very important data that may not be lost over
power-off and for which writing to disk is too insecure. Note
however that most NVRAM space in a PC belongs to the BIOS and you
should NEVER idly tamper with it. See Ralf Brown's interrupt list
for a guide to the use of CMOS bytes by your BIOS.

On Atari machines, /dev/nvram is always configured and does not need
to be selected.

This driver is also available as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called nvram.o. If you want to compile it as a
module, say M here and read <file:Documentation/modules.txt>.