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<li class="toctree-l1 current"><a class="current reference internal" href="">Brief description of DriverDisc version 3</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#devices-which-can-contain-dds">Devices which can contain DDs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#selecting-dd-manually">Selecting DD manually</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#automatic-driverdisc-detection">Automatic DriverDisc detection</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#ddv3-structure">DDv3 structure</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#initrd-overlay-driverdisc-image">Initrd overlay driverdisc image</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#firmware-and-module-update">Firmware and module update</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#package-installation">Package installation</a></li>
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<div class="section" id="brief-description-of-driverdisc-version-3">
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<h1>Brief description of DriverDisc version 3<a class="headerlink" href="#brief-description-of-driverdisc-version-3" title="Permalink to this headline">¶</a></h1>
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<p>For a new major release we decided to introduce a new version of DriverDisc
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feature to ensure the smoothest vendor and user experience possible. We had
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many reasons for it:</p>
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<ul class="simple">
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<li>the old DD didn’t support multiple architectures</li>
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<li>the old DD wasn’t particulary easy to create</li>
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<li>the old DD had two copys of modules, one for anaconda and one for
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instalation</li>
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<li>the modules in old DD weren’t checked for kernel version</li>
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</ul>
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<p>We also changed the feature internal code to enable some functionality that
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was missing from the old version. More about it below.</p>
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<div class="section" id="devices-which-can-contain-dds">
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<h2>Devices which can contain DDs<a class="headerlink" href="#devices-which-can-contain-dds" title="Permalink to this headline">¶</a></h2>
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<p>The best place to save your DriverDisc to is USB flash device. We also support
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(or plan to) IDE and SATA block devices with or without partitions, DriverDisc
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image stored on block device, initrd overlay (see documentation below) and for
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special cases even network retrieval of DriverDisc image.</p>
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</div>
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<div class="section" id="what-can-be-updated-using-dds">
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<h2>What can be updated using DDs?<a class="headerlink" href="#what-can-be-updated-using-dds" title="Permalink to this headline">¶</a></h2>
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<p>All drivers for block devices, which weren’t used for retrieving DriverDiscs,
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the same applies also for network drivers eg. you cannot upgrade network
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driver for device, which was used prior the DriverDisc extraction.</p>
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<p>RPMs for installation. If the DriverDisc repo contains newer package, than the
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official repository, the newer package will get used.</p>
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<p>We also plan to support anaconda’s updates.img placement on the DriverDisc to
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update stage2 behaviour of anaconda.</p>
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</div>
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<div class="section" id="selecting-dd-manually">
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<h2>Selecting DD manually<a class="headerlink" href="#selecting-dd-manually" title="Permalink to this headline">¶</a></h2>
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<p>Use the ‘inst.dd’ kernel command line option to trigger DD mode.
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If no argument is specified, the UI will prompt for the location of the driver
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rpm. Otherwise, the rpm will be fetched from the specified location.</p>
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<p>Please consult the appropriate Installer Guide for further information.</p>
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</div>
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<div class="section" id="automatic-driverdisc-detection">
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<h2>Automatic DriverDisc detection<a class="headerlink" href="#automatic-driverdisc-detection" title="Permalink to this headline">¶</a></h2>
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<p>Anaconda automatically looks for driverdiscs during startup.</p>
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<p>The DriverDisc has to be on partition or filesystem which has been labeled
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with ‘OEMDRV’ label.</p>
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</div>
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<div class="section" id="ddv3-structure">
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<h2>DDv3 structure<a class="headerlink" href="#ddv3-structure" title="Permalink to this headline">¶</a></h2>
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<p>The new DriverDisc format uses simple layout which can be created on top of
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any anaconda’s supported filesystem (vfat, squashfs, ext2 and ext3).</p>
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<div class="highlight-python"><div class="highlight"><pre><span></span>/
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|rhdd3 - DD marker, contains the DD's description string
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/rpms
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| /i386 - contains RPMs for this arch and acts as package repo
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| /i586
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| /x86_64
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| /ppc
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| /... - any other architecture the DD provides drivers for
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</pre></div>
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</div>
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<p>There is a special requirement for the RPMs used to update drivers. Anaconda
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picks up only RPMs which provide “kernel-modules = <running kernel version>”.</p>
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</div>
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<div class="section" id="initrd-overlay-driverdisc-image">
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<h2>Initrd overlay driverdisc image<a class="headerlink" href="#initrd-overlay-driverdisc-image" title="Permalink to this headline">¶</a></h2>
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<p>We have designed another possible way of providing updates in network boot
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environments. It is possible to update all modules this way, so if special
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storage module (which gets used early) needs to be updated, this is the
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preffered way.</p>
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<p>This kind of driverdisc image is applied over the standard initrd and so has
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to respect some rules.</p>
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<ul class="simple">
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<li>All updated modules belong to /lib/modules/<kernel version>/.. according to
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their usual location</li>
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<li>All new modules belong to /lib/modules/<kernel version>/updates</li>
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<li>All new firmware files belong to /lib/firmware</li>
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<li>The rpm repo with updated packages belongs to /tmp/DD-initrd/</li>
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<li>The (empty) trigger file /.rundepmod must be present</li>
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</ul>
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</div>
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<div class="section" id="firmware-and-module-update">
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<h2>Firmware and module update<a class="headerlink" href="#firmware-and-module-update" title="Permalink to this headline">¶</a></h2>
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<p>The firmware files together with all .ko files from the RPMs are exploded to
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special module location, which has preference over built-in Anaconda modules.</p>
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<p>Anaconda doesn’t use built-in modules (except some storage modules needed for
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the DD to function properly) during the DriverDisc mode, so even in case when
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you are updating some modules with second (or later) DriverDisc, the updated
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modules will be loaded. There is one exception though, if your module depends
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on a module which is only present in built-in module directory, that built-in
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module gets also loaded.</p>
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</div>
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<div class="section" id="package-installation">
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<h2>Package installation<a class="headerlink" href="#package-installation" title="Permalink to this headline">¶</a></h2>
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<p>It is also possible to include arbitrary packages on the DriverDisc media and
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mark them for installation. You just have to include the package name in the
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package repo for correct architecture and mark it as mandatory.</p>
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</div>
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<div class="section" id="summary">
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<h2>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
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<p>This new DriverDisc format should simplify the DD creation and usage a lot. We
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will gladly hear any comments as this is partially still work in progress.</p>
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