[PATCH 002/002] de2104x: support for systems lacking cache coherence

[Benjamin Herrenschmidt]

On Thu, 2009-02-12 at 13:22 +0200, Risto Suominen wrote:
> Here is a patch that helped me to get my de2104x NIC working on my
> PowerMac 5500. As an interesting side effect, it also made my mesh
> module crash.
> 
> Background can be found here: http://www.spinics.net/lists/netdev/msg88488.html

I'll catch up with the discussion in netdev, I think the workaround
should be in the driver... Or if not, we can do special dma-ops just for
that device.

Just to make sure I didn't miss something, please send me a tarball
of /proc/device-tree of your machine.

Cheers,
Ben.

> Risto
> 
> Allow setting NOT_COHERENT_CACHE explicitly.
> 
> Signed-off-by: Risto Suominen <Risto.Suominen at gmail.com>
> ---
> The testing is done on kernel version 2.6.24.
> 
> --- a/arch/powerpc/platforms/powermac/Kconfig.org	2008-01-25
> 00:58:37.000000000 +0200
> +++ b/arch/powerpc/platforms/powermac/Kconfig	2009-02-10
> 17:44:24.000000000 +0200
> @@ -18,4 +18,10 @@ config PPC_PMAC64
>  	select PPC_970_NAP
>  	default y
> 
> -
> +config NOT_COHERENT_CACHE
> +	bool "Incoherent cache"
> +	default n
> +	help
> +	  Setting this option may be necessary for avoiding cache-related
> +	  problems with some network cards on some platforms. An example is
> +	  2104x and PowerMac 5500.
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