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Re: Questions about the device driver framework

From: Daniel Wagner
Subject: Re: Questions about the device driver framework
Date: Thu, 20 Jan 2005 23:09:01 +0100
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> Why there is the need for a virtual driver?

The ddf should not have knowlegde about the OS which is using it.  So
the real driver can't implement OS dependent code.

> Can't deva, which is OS dependent, trust access to drivers?

It could but that would serialize all access through deva ->
bottleneck.  As soon the real driver trusts a virtual driver they can
communicate without the help of deva.

> Also,
> Does all drivers trust each other?

Nope they don't have to but at some point its getting a bit tiresome
not to trust the device drivers.  Of course you have to be careful
from where new drivers are loaded but as soon a driver gets active in
the ddf it has access to all hardware resources.  So there is no point
in creating a 'secure' environment.

> How a bus driver serve and trust device drivers?

I don't see to what you are referring.  Could you elaborate a bit?


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