2002-10-18 09:56:58

by Gerrit Bruchhäuser

Subject: bootsect.S and magic address 0x78

Hello Linus,


Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
refers to? I mean, is this somewhere specified?

Many thanks and cheers from germany.

Gerrit

2002-10-18 12:55:43

by Sean Estabrooks

Subject: Re: bootsect.S and magic address 0x78

> Hello Linus,
>
>
> Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
> refers to? I mean, is this somewhere specified?
>
> Many thanks and cheers from germany.
>
> Gerrit

> Hello Linus,
>
>
> Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
> refers to? I mean, is this somewhere specified?
>

Hope you'll settle for an answer from a simple lkml lurker and not the top
gun.

The address 0x78 points to the floppy disk drive parameter table
described here: http://www.xs4all.nl/~matrix/fdd_pt.html

A list of all the low memory ROM BIOS vectors and addresses can be
found here: http://www.cybertrails.com/~fys/rombios.htm

Cheers,
Sean

2002-10-19 09:38:07

by Rob Landley

Subject: Re: bootsect.S and magic address 0x78

On Friday 18 October 2002 05:03, Gerrit Bruchh?user wrote:
> Hello Linus,
>
>
> Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
> refers to? I mean, is this somewhere specified?
>
> Many thanks and cheers from germany.
>
> Gerrit

I believe Tigran's Linux Kernel Internels guide for 2.4 covers this, you can
download it from here:

http://www.tldp.org/guides.html

Alas, there isn't a 2.5 guide yet. Moves too fast. :)

Rob

2002-10-21 06:31:32

by Gerrit Bruchhäuser

Subject: Re: bootsect.S and magic address 0x78

Hello Sean,

thank you very much - you realy helped me a lot. I wrote to the top
because this question had been already posted many times. See for
instances: http://www.leto.net/mail/linuxasm/2001/msg00538.html

If this is ok for you then I would like to copy+paste your answer to all
these postings I crossed.

Many thanks and cheers!

Gerrit


Sean Estabrooks schrieb:

>>Hello Linus,
>>
>>
>>Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
>>refers to? I mean, is this somewhere specified?
>>
>>Many thanks and cheers from germany.
>>
>>Gerrit
>>
>>
>
>
>
>>Hello Linus,
>>
>>
>>Can you tell me where this magic address 0x78 in arch/i386/bootsect.S
>>refers to? I mean, is this somewhere specified?
>>
>>
>>
>
>Hope you'll settle for an answer from a simple lkml lurker and not the top
>gun.
>
>The address 0x78 points to the floppy disk drive parameter table
>described here: http://www.xs4all.nl/~matrix/fdd_pt.html
>
>A list of all the low memory ROM BIOS vectors and addresses can be
>found here: http://www.cybertrails.com/~fys/rombios.htm
>
>Cheers,
>Sean
>
>
>
>