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Re: TITAN GE driver

To: "Anoop P.A." <Anoop_P.A@pmc-sierra.com>
Subject: Re: TITAN GE driver
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 28 May 2010 17:27:22 +0100
Cc: linux-mips <linux-mips@linux-mips.org>
In-reply-to: <A7DEA48C84FD0B48AAAE33F328C0201404E2D834@BBY1EXM11.pmc_nt.nt.pmc-sierra.bc.ca>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <A7DEA48C84FD0B48AAAE33F328C0201404E2D834@BBY1EXM11.pmc_nt.nt.pmc-sierra.bc.ca>
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User-agent: Mutt/1.5.20 (2009-08-17)
On Thu, May 27, 2010 at 10:51:47PM -0700, Anoop P.A. wrote:

> Any body used titan GE device with more than 512MB physical memory?   
> 
>  
> 
> If buffer is getting allocated above physical address 0x1fff_ffff ( ie.
> 30 bit buffer address) we may have to consider setting XDMA_BUFFADDRPRE
> (0x5018 ) .This is not taken care in original driver.  Any body had luck
> in enabling this prefix. I have tried enabling it and I could do flood
> ping with out packet loss. However when I do mass data transfer kernel
> getting panic. Further investigation showed kenel panics because DMA
> copies data to wrong address (which is being used).

The driver has not been used in ages so it's generally in a sad shape,
doesn't even compile.  I think nobody touched this driver seriously in
5 years, probably longer.  So it's sort of expected to eat your cat or
do other nasty stuff.

  Ralf

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