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Date:   Thu, 10 Apr 2014 14:46:12 +0200
From:   Ralf Baechle <ralf@linux-mips.org>
To:     Miod Vallat <miod@online.fr>
Cc:     linux-mips@linux-mips.org
Subject: Re: arch/mips/sgi-ip22/Platform:29: *** gcc doesn't support needed
 option -mr10k-cache-barrier=store.  Stop.
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On Thu, Apr 10, 2014 at 12:10:41PM +0000, Miod Vallat wrote:

> > Odd, I thought R10K systems were locked to booting 64-bit kernels only.  At
> > least the Octane was when it was bootable.  Not sure about IP27.
> 
> The Octane needs a 64-bit ARCS and kernel only because none of its
> physical memory is addressable with KSEG0/KSEG1.
> 
> > >> IP26 (R8000) is not supported in Linux.  I think OpenBSD got it
> working, though.
> 
> For some very limited value of working (it boots single-user but does not
> last long due to page table corruption).

The R8000 is infamous for its buggyness.  In a silent night in Mountain View
you can still hear SGI IRIX developers' curses echoing from distant
mountains ...

  Ralf