Re: reading BIOS dump

Randy Howard wrote:
On Fri, 29 Dec 2006 17:02:07 -0600, Bill Cunningham wrote

The answer to the OP's question is it starts at f0000 (f000:0000
for the old DOS crowd). You can open /dev/mem, seek to that
address and read it as if it were a file. It's the entire
"segment", or 64K in length.

Instead of going to the trouble to write a small C program what
about using the dd command. Copy if=/dev/mem to of= and use bs=64k
and seek=0xffff0 ? Would that work ? I'll try it if it sounds safe
I don't want to screw up my system.

Reading from /dev/mem can't hurt your system. Writing to it is
another matter entirely.

What if i/o is memory mapped? Reading a location may reset a
'ready' flag and/or empty a hardware buffer.

--
Merry Christmas, Happy Hanukah, Happy New Year
Joyeux Noel, Bonne Annee.
Chuck F (cbfalconer at maineline dot net)
<http://cbfalconer.home.att.net>


.

Relevant Pages

  • Re: reading BIOS dump
    ... for the old DOS crowd). ... Reading from /dev/mem can't hurt your system. ... another matter entirely. ... What if i/o is memory mapped? ...
    (comp.programming)
  • Re: Counterexample
    ... >> Powerpoint sucks time from everyone within reach, ... by the number of attendees) instead of simply reading the charts ... Randy Howard ...
    (comp.programming)
  • Re: Programming Language Research Engine
    ... Randy Howard said: ... You know somethin', Randy? ... Reading can get you into a lot of trouble. ...
    (comp.programming)