apps/doc/kinfocenter/dma/index.docbook

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   8 <article lang="&language;">
   9 <title><acronym>DMA</acronym> Channel Information</title>
  10 <articleinfo>
  11
  12 <authorgroup>
  13 <author>&Matthias.Hoelzer-Kluepfel;</author>
  14 <author>&Helge.Deller;</author>
  15 <author>&Duncan.Haldane;</author>
  16 <author>&Mike.McBride;</author>
  17 <!-- TRANS:ROLES_OF_TRANSLATORS -->
  18 </authorgroup>
  19
  20 <date>2002-02-12</date>
  21 <releaseinfo>3.00.00</releaseinfo>
  22
  23 <keywordset>
  24 <keyword>KDE</keyword>
  25 <keyword>KControl</keyword>
  26 <keyword>DMA</keyword>
  27 <keyword>system information</keyword>
  28 </keywordset>
  29 </articleinfo>
  30
  31 <sect1>
  32 <title><acronym>DMA</acronym> Channel Information</title>
  33
  34 <para> This page displays information about the <acronym>DMA</acronym>
  35 (Direct Memory Access) Channels.  A <acronym>DMA</acronym> channel is a
  36 direct connection that allows devices to transfer data to and from
  37 memory without going through the processor. Typically, i386-architecture
  38 systems (<acronym>PC</acronym>'s) have eight <acronym>DMA</acronym>
  39 channels (0-7).  </para>
  40
  41 <note> <para> The exact information displayed is system-dependent.  On
  42 some systems, <acronym>DMA</acronym> Channel information cannot be
  43 displayed yet.  </para> </note>
  44
  45 <para> On &Linux;, this information is read from <filename
  46 class="devicefile">/proc/dma</filename>, which is only available if the
  47 <filename class="directory">/proc</filename> pseudo-filesystem is
  48 compiled into the kernel.  </para>
  49
  50 <para> A list of all currently-registered (<acronym>ISA</acronym> bus)
  51 <acronym>DMA</acronym> channels that are in use is shown. The first
  52 column shows the <acronym>DMA</acronym> channel, and the second column
  53 shows the device which uses that channel.  </para>
  54
  55 <para>
  56 Unused <acronym>DMA</acronym> channels are not listed.
  57 </para>
  58
  59 <para>
  60 The user cannot modify any settings on this page.
  61 </para>
  62
  63 </sect1>
  64 </article>