Linux on a 386/16 and 287 copro ???

Linux on a 386/16 and 287 copro ???

Post by Mike You » Wed, 19 Oct 1994 03:59:06



        OK Linux gurus, here's one for you. I've been happily running
Linux 1.1.50 on a Packard Bell 386DX/16 system. But this one is different.
It has a socket for a 80287 copro chip instead of a 387 !! Now, Dos and
Windoze don't mind it a bit, and use the 287. But Linux pukes unless I
specify "no387" to init (which enables the floaating emulation code).
Question is this: is there any hope of getting Linux to use the
copro *at all* ?

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Linux on a 386/16 and 287 copro ???

Post by Michael Haard » Thu, 20 Oct 1994 04:46:36



>    OK Linux gurus, here's one for you. I've been happily running
> Linux 1.1.50 on a Packard Bell 386DX/16 system. But this one is different.
> It has a socket for a 80287 copro chip instead of a 387 !! Now, Dos and
> Windoze don't mind it a bit, and use the 287. But Linux pukes unless I
> specify "no387" to init (which enables the floaating emulation code).
> Question is this: is there any hope of getting Linux to use the
> copro *at all* ?

I am not sure (no guru), but I think the 287 is a subset of the 387.  So
you need the fp emulation, but things like adding and multiplication
will be handled by the 287, whereas other operations are done by the
387 emulation which gets active when the 287 can't handle the
instruction (by not knowing it or being missing entirely).

Michael
--
Twiggs and root are a wonderful tree (tm) Twiggs & root 1992 :-)
d? H- s(+)/(-) g! au a- w v(---) C++(+++) UUL++++S++++?++++ L++ 3 E-


 
 
 

Linux on a 386/16 and 287 copro ???

Post by Ron DuFres » Wed, 19 Oct 1994 14:55:12




>    OK Linux gurus, here's one for you. I've been happily running
>Linux 1.1.50 on a Packard Bell 386DX/16 system. But this one is different.
>It has a socket for a 80287 copro chip instead of a 387 !! Now, Dos and
>Windoze don't mind it a bit, and use the 287. But Linux pukes unless I
>specify "no387" to init (which enables the floaating emulation code).
>Question is this: is there any hope of getting Linux to use the
>copro *at all* ?

Very, very old packard bell you have there.  I have a 386/16, and it's
aged also, but still has the 387 slot which is filled.  Linux likes it's
home here, but we run an old kernel 1.0.8...

I know it's time to upgrade here, and sounds as though it's time to do
likewise there...

Ron DuFresne

\

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1. Linux on 386/16, 512K + 2 MB, & MFM, Anyone ?

[ Article crossposted from comp.os.linux.help ]

[ Posted on 15 Nov 1994 19:58:45 GMT ]

Hi Guys !

Is this possible ? I have tried _many_ configurations, including loadlin,
different custom compiled kernels & precompiled ones, lilo, no lilo, etc ..

I don't get _any_ messages, error or otherwise. Just hangs upon booting
with floppy.

Using loadlin, Since I configured dos to see 640K of memory, mapping is
wrong, (physical to virtual). Can't loadlin on 512K.

Hearsay; vague memories; guesses; pointers to specialized reading/hacking;
brilliance; all welcome,  :-)

Is the problem the machine ? or me ? It _had_ Xenix on the hard drive, (at
least a boot prompt)

Thanks in advance, specially for telling me it's possible :-). I'm trying
just to get it up and running for my provider who'd like to use Linux as a
newsbox as opposed to BSDI, since our ext2fs is reportedly a _lot_ faster
for smaller accesses, but would like to play around with it first. We'll
definitely throw in a large drive as soon as I get things configured.

Regards.

--
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 --Jay                     o        
                         <#<         " Above all.... have fun."
 +*+ Credits: smartmail__>^>__by * Linux+Pine3.91+Smail+Term-2.2.2+PoP +*

            -=[ telnet sos.sos.net 2023" login as "Jtalk" ]=-

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