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Date: Mon, 11 Mar 2002 19:04:33 +0300
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
To: Jay Estabrook <Jay.Estabrook@compaq.com>
Cc: Kurt Garloff <garloff@suse.de>, Jochen Friedrich <jochen@scram.de>,
        linux-kernel@vger.kernel.org, Richard Henderson <rth@twiddle.net>
Subject: Re: Busmaster DMA broken in 2.4.18 on Alpha
Message-ID: <20020311190433.A16552@jurassic.park.msu.ru>
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In-Reply-To: <20020311100200.A1181@linux04.mro.cpqcorp.net>; from Jay.Estabrook@compaq.com on Mon, Mar 11, 2002 at 10:02:00AM -0500
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On Mon, Mar 11, 2002 at 10:02:00AM -0500, Jay Estabrook wrote:
> There are ISA cards, regardless of what ISA bus machine they are
> plugged into, that are able to generate only something less than
> 32-bits worth of address.

Indeed, I missed that.

> Since ISA devices don't have pci_dev structures, there's (currently)
> no way to pass an ISA device-dependent DMA mask to the IOMMU routines.
> Perhaps there needs to be an addition to the API that would allow
> for this (pci_set_isa_device_dma_mask()) ???

Yes, it would be nice to have something like this.

Another workaround also seems to be possible - for ISA devices
use mask other than 0x00ffffff _only_ if we don't have working
IOMMU. This doesn't help to get older Miatas work with such
type of ISA cards though...

Ivan.
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