Mapping Video BIOS?

[Greg 'groggy' Lehey]

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  |........ ...>..@|
  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
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