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Message-ID: <3D3FB6C8.1070409@evision.ag>
Date: Thu, 25 Jul 2002 10:28:56 +0200
From: Marcin Dalecki <dalecki@evision.ag>
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To: Vojtech Pavlik <vojtech@suse.cz>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       William Lee Irwin III <wli@holomorphy.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC/CFT] cmd640 irqlocking fixes
References: <20020724225826.GF25038@holomorphy.com> <1027559111.6456.34.camel@irongate.swansea.linux.org.uk> <20020725095448.B21541@ucw.cz>
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Vojtech Pavlik wrote:

> 
> The kernel functions are OK. The problem is that the kernel can use
> PCIBIOS calls to set the registers. And certain old buggy BIOSes which
> violate the PCI spec can use wrong size data transfers to set the
> registers, which the CMD640 doesn't like.
> 
> IMHO the best workaround here would be either to disable PCIBIOS calls
> and revert to conf1 or conf2 in the PCI code if a CMD640 is present, or
> just panic() in the CMD640 code and suggest to the user to use
> "pci=nobios" on the kernel command line. I'd actually prefer the later.
> 

 From a long long time ago during the first days of this driver I 
remember that those chips could be wired to both PCI and VLB(ISA) bus.
And this is the main reaons why the functions is question exist in first 
place -> "emulating" PCI configuration space access on VLB.


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