linux-kernel - Re: Reading /dev/mem by dd

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Message-ID: <20100216123141.6c601dfd@lxorguk.ukuu.org.uk>
Date:	Tue, 16 Feb 2010 12:31:41 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nameer Yarkon <nameer.yarkon@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Reading /dev/mem by dd

> how does X11 get now direct access to the physical memory (instead of
> /dev/mem) ?

Via frame buffer devices.

If you think about things like hot-plug it's rather hard to do frame
buffer access any other way. The rules on memory types and aliasing also
make it nearly impossible to do properly with /dev/mem on a modern CPU.

Alan
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