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

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Date:	Wed, 11 Feb 2009 14:18:52 +0200
From:	Risto Suominen <risto.suominen@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	khc@...waw.pl, netdev@...r.kernel.org
Subject: Re: [PATCH 002/002] de2104x: support for systems lacking cache 
	coherence

2009/2/11 David Miller <davem@...emloft.net>:
>
> I think the pci_alloc_consistent() implementation for your particular
> platform should be fixed instead :-)
>
Looks like it works as expected with 2.6.24. This patch is all that is needed.

Still I think that my first solution was beautiful in its simplicity
:) (and usable with older kernels)

Risto

Allow setting NOT_COHERENT_CACHE explicitly.

Signed-off-by: Risto Suominen <Risto.Suominen@...il.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.

View attachment "incoherent_cache.patch" of type "text/x-diff" (635 bytes)