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Date:	Sun, 4 Apr 2010 09:31:00 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	"tek-life" <teklife.kernel@...il.com>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: Can we remove the Zone_DMA?

Am Sonntag, 4. April 2010 06:21:54 schrieb tek-life:
> In Linux , The Memory is divided to three zone. They are ZONE_DMA
> 、ZONE_NORMAL  and ZONE_HIGHMEM. From the book of "Undstand the Linux
> kernel ", the ZONE_DMA has the effect that the Direct Memory Access
> (DMA) processors for old ISA buses have a strong limitation: they are
> able to address only the first 16 MB of RAM. SO ,we must set a zone
> for  the DMA on ISA bus.  And I suspect that the hardware has
> developed so quickly .And  in this days the ISA has been weeded out.

Floppy disks & paralell ports still use DMA

	Regards
		Oliver
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