[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists