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Re: Enhanced 2.2.12 MIPS Kernel Sources Available

To: "Kevin D. Kissell" <>, <>, <>
Subject: Re: Enhanced 2.2.12 MIPS Kernel Sources Available
From: "Bradley D. LaRonde" <>
Date: Thu, 10 Feb 2000 05:06:21 -0500
References: <002401bf734c$e8b5cac0$>
RFC: What about geting the same FPU emulation into SGI's tree?


----- Original Message ----- 
From: "Kevin D. Kissell" <>
To: <>; <>
Sent: Wednesday, February 09, 2000 5:27 PM
Subject: Enhanced 2.2.12 MIPS Kernel Sources Available

> As many of you will have inferred, MIPS Technologies Inc
> has been working on the MIPS/Linux kernel for the past
> six months or so, driven by the need for a flexible software
> platform for valdiation and characterisation of new MIPS
> processor designs.  Relatively early on, we made the difficult
> decision not to try to track the SGI Linux repository: It was
> too unstable, and the SGI activity is driven by a very
> different set of goals.  We therefore took the 2.2.12
> kernel sources from, and worked from there.
> I've shared some of our bug findings and fixes with 
> the SGI mailing list, and still more of them with Ralf
> directly, but a lot of other changes and improvements
> have been made that will certainly be of interest to readers
> of this list, particularly those targeting non-SGI platforms.
> This kernel supports the new generation of 32-bit MIPS
> CPUs with R4K exception models.  This involved fairly
> extensive changes to semaphore support and to TLB
> and cache management routines.  We know it works on
> the MIPS 4Kc, and with appropriate additions to the
> table of recognized CPUs in the (revised) CPU probe
> code, it should run on the IDT 323xx, and Toshiba TX49
> processor families as well.
> It includes an integrated FPU emulator that handles 
> the full MIPS FP instruction set, and allows FPU-less
> CPUs to run standard MIPS/Linux binaries.
> It contains a number of endianness fixes in the kernel
> and driver code, and is very stable in both configurations.
> It contains platform support for the Algorithmics P-5064
> and MIPS "Atlas" development boards, as well as the
> SGI Indy.
> This code is NOT a supported product of MIPS
> Technologies Inc.   It is being made available on an
> "as is" basis subject to the ususal GPL.  It should be
> accessible via anonymous (and blind) FTP for a while at
> and is archived on the Paralogos MIPS/Linux web site at 
>  We'd be very interested
> in any feedback, experimental results, and enhancements
> that any of you may wish to provide, and I will answer
> email questions to the extent that my time allows.
>             Regards,
>             Kevin K.
> __
> Kevin D. Kissell
> MIPS Technologies European Architecture Lab
> Tel. +
> FAX. +

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