R5000 Linux

R5000 Linux

[Clarence Donath]

Hello,

Is there a Linux kernel for the R5000 IP32?  I would like to get involved.

I've successfully configured this SGI O2 to boot the available R4000 IP22 
kernel so I'm ready to go with IP32 if someone would be so kind as to point 
me to an existing kernel.

Thank you,
Clarence Donath

Re: R5000 Linux

[Guido Guenther]

On Thu, Apr 17, 2003 at 09:12:55AM -0400, Clarence Donath wrote:
> Is there a Linux kernel for the R5000 IP32?  I would like to get involved.
I can send you a binary image if that's what you're looking for
(although I'm definitely not the right person to offer this since I have
almost 0 knowledge about the O2). I'd recommend to start from the
sources which are available through linux-mips.org's cvs repository.
See:
 http://www.linux-mips.org/kernel.html 
and the patches for the O2 for 2.5 are here:
 http://www.linux-mips.org/~glaurung/
You'll also find a cross toolchain there. The major show stopper for me
is currently the "do_cpu invoked from kernel context!" problem which I
didn't find any time to look into yet. I wonder wether I'm the only
person seeing this?

> 
> I've successfully configured this SGI O2 to boot the available R4000 IP22 
> kernel so I'm ready to go with IP32 if someone would be so kind as to point 
> me to an existing kernel.
Check out the excellent Linux O2 howto (but if you've done that for IP22
alreay this will be easy):
 http://www.total-knowledge.com/progs/mips/o2-howto.shtml
Regards,
 -- Guido

Re: R5000 Linux

[ilya]

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On Thu, Apr 17, 2003 at 04:56:50PM +0200, Guido Guenther wrote:
> You'll also find a cross toolchain there. The major show stopper for me
> is currently the "do_cpu invoked from kernel context!" problem which I
> didn't find any time to look into yet. I wonder wether I'm the only
> person seeing this?
I was able to reproduce it with following simple sequence of events:
#(while true; do true; done)>/dev/zero
As soon as I interrupt this, do_cpu oops happened. Problem occurs
somewhere in signeal handlin code. I didn't investoigate further yet, as
for what I am doing at the moment it is not a problem.

What is a problem, is memory leak in 2.5.47. Every time *any* process is forked,
system permenently looses few K of memory. Modifying above loop to run
cat</proc/meminfo will bring down system to its knees in about 5-10 minutes.


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Re: R5000 Linux

[ilya]

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O2-HOWTO: http://www.total-knowledge.com/progs/mips/o2-howto.shtml
more on the subject + kernel binaries + patches at
http://www.linux-mips.org/~glaurung/

On Thu, Apr 17, 2003 at 09:12:55AM -0400, Clarence Donath wrote:
> Hello,
> 
> Is there a Linux kernel for the R5000 IP32?  I would like to get involved.
> 
> I've successfully configured this SGI O2 to boot the available R4000 IP22 
> kernel so I'm ready to go with IP32 if someone would be so kind as to point 
> me to an existing kernel.
> 
> Thank you,
> Clarence Donath
> 

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