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Adaptation/GUID-10C986FD-BD56-4F8E-87EC-7B890EFCDAC7.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-10C986FD-BD56-4F8E-87EC-7B890EFCDAC7" xml:lang="en"><title>DMA Chipset Configuration</title><shortdesc>Chipset configuration is performed entirely within the
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platform service implementation.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The DMA controller chipset has multiple DMA channels that can be
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configured for different DMA transfers. Drivers generally initialize
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and open the required DMA channel and use this channel to do the DMA
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transfers. </p>
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<p>For some peripherals, such as the Camera and the Display controller,
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there can be dedicated DMA channels that cannot be configured for
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DMA transfers by other peripherals. </p>
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<p>To configure the channels and other features of the chipset, you
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may need to write code. This code should be executed prior to the
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DMA channels being used for the first time, or to configure dynamically-allocated
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channels.</p>
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<p>This requires chipset specific code which is beyond the scope of
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this documentation. Please refer to your chipset's datasheet and any
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accompanying documentation for details on how to perform any required
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chipset configuration.</p>
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<p><note>If you need to perform chipset configuration after the device
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driver has loaded, there is an <xref href="GUID-93A3F01A-3489-37E5-921C-5EA5228545AA.dita"><apiname>Extension()</apiname></xref> function.
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This function passes chipset specific code or instructions from the
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client to the platform service implementation. Implementation of the <xref href="GUID-93A3F01A-3489-37E5-921C-5EA5228545AA.dita"><apiname>Extension()</apiname></xref> API is platform specific and is not covered
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further in this documentation.</note></p>
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</conbody></concept>
FCL/sftools/depl/docscontent