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Re: [PATCH] IP28 support

To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Subject: Re: [PATCH] IP28 support
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 29 Nov 2007 12:15:57 +0000
Cc: linux-mips@linux-mips.org
In-reply-to: <20071129095844.GA9106@alpha.franken.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20071126224004.D885AC2B26@solo.franken.de> <20071128143459.GA22943@linux-mips.org> <20071129095844.GA9106@alpha.franken.de>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.17 (2007-11-01)
On Thu, Nov 29, 2007 at 10:58:44AM +0100, Thomas Bogendoerfer wrote:

> I've changed that in the updated IP28 patch. I don't see a way to
> support ISA busmaster devices, because they will generate a physical
> address between 0 and 0x1000000, which will only hit the 512 KB
> mirrored RAM. Anything which uses ISA slave DMA is able to address
> the full 32bit address space.

Those 512kB could be used as a fairly claustrophobic ZONE_DMA.  Not
pretty though.

  Ralf

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