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<!-- name="Rogier Wolff" -->
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<!-- subject="Re: success: Mustek 1200SP, firmware 1.02" -->
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<title>sane-devel: Re: success: Mustek 1200SP, firmware 1.02</title>
<h1>Re: success: Mustek 1200SP, firmware 1.02</h1>
<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
<i>Tue, 30 Sep 1997 01:09:33 +0200 (MET DST)</i>
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Nils Schuller wrote:<br>
<i>&gt; </i><br>
<i>&gt; A question to those who have the backround and could do this: Would it</i><br>
<i>&gt; be possible to have some sort of dynamic allocation of BIG_BUFF-space at</i><br>
<i>&gt; runtime? This would make much sense for scanning: depending on the size</i><br>
<i>&gt; of a scan the program would request the needed amount?</i><br>
<i>&gt; I have no idea, if the kernel supports things like that, or if it would</i><br>
<i>&gt; be too hard to do that?</i><br>
<p>
There is not much the kernel can do dynamically with this: You need<br>
contiguous physical memmory (until the IO system gets a complete<br>
overhaul as Larry Mcvoy is propagating). <br>
<p>
&lt;commercial plug&gt; I'm in the business of writing Linux device drivers,<br>
and I can handle a new assignment any time now :-) Anybody know a<br>
device driver that needs writing fast? &lt;/commercial plug&gt;<br>
<p>
The upside of this is that I have I'll write up a patch tomorrow that<br>
allows several different subsystems to allocate memory from a single <br>
buffer that is allocated at boot time. <br>
<p>
For example a video grabber would need a big contiguous physical<br>
buffer, just like "sg". Using my big buffer patch, you would be able<br>
to share that buffer between these two "users". <br>
<p>
Roger.<br>
<p>
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