The functions come from asm/io.h, 0x70 is the CMOS memory address I/O port, and 0x71 is the CMOS memory data I/O port. It looks like http://www.faqs.org/docs/Linux-mini/IO-Port-Programming.html
has some good information on this topic. I know "The Undocumented PC" by Van Gilluwe has a pretty thorough discussion of the CMOS ports as well.
On 1/23/07,
Ben Racher <mack.stout@gmail.com> wrote:
ron minnich wrote:
> On 1/22/07, mack stout <mack.stout@gmail.com> wrote:
>
>> Does linuxbios support altering bios settings from userspace?
>
> it's easy to do this.
>
> You need the simple tools that read and write cmos.
>
> Attached.
>
> ron
perfect! just what I had been looking for, and it even works fine with
phoenix award bios! I just set the settings that I want to change, dump
it, and then write it to clients (with exact same hardware) and the
settings are applied. amazing!
now i just need to learn what actually happens in these 35 lines of code
:-) what library does
outb(regno, 0x70); come from? and 0x70 represents the memory where cmos
starts at?
ben
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