vmware bochs osr5 under linux

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From: Bela Lubkin <belal@caldera.com>
Subject: Re: INT13 function FAh during boot?
Date: Tue, 23 Apr 2002 00:34:49 GMT
References: <c12f3009.0204221242.29c063c4@posting.google.com> 

Carl Sopchak wrote:

> I've been trying to install OSR5 on top of linux using 'bochs' (a
> pentium emulator).  During the boot of the install disk (and if I
> recall correctly, any OSR5 bootable diskette), I get an error from
> bochs stating that it doesn't know function AH=FA for interrupt 13
> (I'm paraphrasing).  I've been working with the bochs people to get
> around this (and a hack that ignores this function succeeds to boot
> the floppy).  I've been trying to find information on what SCO is
> trying to do with this call, but all I've run across is a mention of
> PC Tools VSAFE and VWATCH functions.
> 
> Does anyone know what SCO is attepmting to do when calling int13 with
> AH=FA?  Could it really be checking for PC Tools???  I'm wondering
> primarilly to see how critical programming this function of INT13
> might be.  (If it is, maybe I'll try my hand at it...)

This is appararently trying to detect LAN boot PROMs supplied by either
LANWorks or Dirk Koeppen EDV-Beratungs-GmbH.  The code expects these
calls to return with the carry flag set if the PROMs it's probing for
are not present.

I believe that is the defined behavior for any case where a supported
BIOS API interrupt is being called with an unsupported subfunction -- it
should return with general purpose registers unchanged, and carry set.
(Not 100% sure about the part about general purpose registers being left
unchanged.)

Bochs should automatically implement this for all unknown subfunctions.
You should only be having a problem if Bochs actually tries to supply
some other API that would respond to INT 13 function FA (and apparently
it doesn't, or it wouldn't give you an error saying that it doesn't know
that function...)

>Bela<
 

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