Re: Mapping Video BIOS?

From: Greg 'groggy' Lehey <grog_at_lemis.com>
Date: Mon, 28 Jul 2003 14:01:55 +0930
On Sunday, 27 July 2003 at 22:17:32 -0600, M. Warner Losh wrote:
> In message: <20030728041557.GU45069_at_wantadilla.lemis.com>
>             "Greg 'groggy' Lehey" <grog_at_freebsd.org> writes:
>> On Sunday, 27 July 2003 at 22:11:29 -0600, M. Warner Losh wrote:
>>> Where are you getting the data?  A windows tool?
>>
>> If you're talking about the BIOS contents I'm printing, yes, I'm using
>> a Microsoft tool called DEBUG (which has been around since before
>> Microsoft bought DOS :-).
>
> I don't suppose that you could use FreeBSD's /dev/mem + od?

Yup, can do.

  # dd if=/dev/mem bs=64k skip=12 count=1 | hd | less

  00000000  55 aa 78 e9 44 06 00 00  00 00 00 00 00 00 00 00  |U.x.D...........|
  00000010  00 00 00 00 00 00 00 00  68 01 00 00 00 00 49 42  |........h.....IB|
  ...
  0000bff0  04 03 80 00 0c 00 00 00  20 00 10 0b 3e 00 02 40  |........ ...>.._at_|
  0000c000  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
  *
  00010000

That's pretty much what I expected.  Up to offset bff0, it's identical
with the Microsoft dump.

Greg
--
Finger grog_at_lemis.com for PGP public key
See complete headers for address and phone numbers

Received on Sun Jul 27 2003 - 19:31:59 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:16 UTC