Re: Problems getting linux APM provisions (0.5) on thinkpad 701cs

[Ken Manheimer <klm@CNRI.Reston.VA.US>]

Petran Schmidt's response, follows, was the answer to my problem.
Much thanks - i figured someone out there had encounted this, and it's
very cool that these mailing lists and help groups give us (me!)
access to the answers!

Here's petran's response:

From: Petran Schmidt <schmidt@cranium>
Message-Id: <9511061630.AA00453@cranium>
Subject: linux APM
To: klm@CNRI.Reston.Va.US
Date: Mon, 6 Nov 1995 11:30:23 -0500 (EST)

I had a similar problem, and wrote Stephen Rothwell (the original APM
author).  Here's my message to him and his response (edited).

> The code gave me a linker error for symbol "_apm_bios_entry" not found.  I
> found the string on line 106 of apm_bios.c, and figured that possibly the
> first underscore was not necessary with my compiler and saw that the only
> thing that I could find that this could be referencing is the variable
> apm_bios_entry declared later in the same file:
> 
> apm_bios.c:106:         "lcall %%cs:_apm_bios_entry\n\t" \
> apm_bios.c:189:}                                apm_bios_entry;
> 
> after changing line 106 to:
> apm_bios.c:106:         "lcall %%cs:apm_bios_entry\n\t" \
> 
> I compiled it and it compiled without errors.  I thought that I'd see if you
> had some insight into this before I load the kernel.  I've been scanning the
> newsgroups for a discussion of this, and haven't found any.  Am I the only
> person to experience this problem?  Am I missing a compiler flag?

This is caused because you are compiling the kernel in ELF which
does not use the leading underscore on external symbol names.
You have made the correct change, and it should work.

Others have experieneced this problem.

I suggest that you subscribe to the linux-apm mailing list at vger.rutgers.edu
as further announcements/discussion will occur there.  I have handed
APM stuff over to Rik Faith (at least temporarily).  He has made a version
for the 1.3.x kernels and is attempting to get it into the kernel proper.
----------------------------------------------------------------

I hope that this is helpful.

    -Peter Schmidt