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| <section id="slip"> |
| <h1>SLIP<a class="headerlink" href="#slip" title="Permalink to this heading"></a></h1> |
| <section id="slip-configuration"> |
| <h2>SLIP Configuration<a class="headerlink" href="#slip-configuration" title="Permalink to this heading"></a></h2> |
| <ol class="arabic"> |
| <li><p>Configure and build NuttX with SLIP enabled in the configuration. Load this |
| into FLASH and start the device.</p></li> |
| <li><p>Connect to a Linux box using a serial cable. This discussion assumes that the |
| serial device is <code class="docutils literal notranslate"><span class="pre">/dev/ttyS0</span></code> on both the target and the Linux box.</p></li> |
| <li><p>Reset on the target side and attach SLIP on the Linux side:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>modprobe<span class="w"> </span>slip |
| $<span class="w"> </span>slattach<span class="w"> </span>-L<span class="w"> </span>-p<span class="w"> </span>slip<span class="w"> </span>-s<span class="w"> </span><span class="m">57600</span><span class="w"> </span>/dev/ttyS0<span class="w"> </span><span class="p">&</span> |
| </pre></div> |
| </div> |
| <p>This should create an interface with a name like sl0, or sl1, etc. Add -d to |
| get debug output. This will show the interface name.</p> |
| <p>NOTE: The -L option is included to suppress use of hardware flow control. |
| This is necessary only if you are not supporting hardware flow control on |
| the target.</p> |
| <p>NOTE: The Linux slip module hard-codes its MTU size to 296. So you might |
| as well set <code class="docutils literal notranslate"><span class="pre">CONFIG_NET_ETH_MTU</span></code> to 296 as well.</p> |
| </li> |
| <li><p>After turning over the line to the SLIP driver, you must configure the |
| network interface. Again, you do this using the standard ifconfig and |
| route commands. Assume that we have connected to a host PC with address |
| 192.168.0.101 from your target with address 10.0.0.2. On the Linux PC |
| you would execute the following as root (assuming the SLIP is attached |
| to device sl0):</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>ifconfig<span class="w"> </span>sl0<span class="w"> </span><span class="m">10</span>.0.0.1<span class="w"> </span>pointopoint<span class="w"> </span><span class="m">10</span>.0.0.2<span class="w"> </span>up |
| $<span class="w"> </span>route<span class="w"> </span>add<span class="w"> </span><span class="m">10</span>.0.0.2<span class="w"> </span>dev<span class="w"> </span>sl0 |
| </pre></div> |
| </div> |
| </li> |
| <li><p>For monitoring/debugging traffic:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>tcpdump<span class="w"> </span>-n<span class="w"> </span>-nn<span class="w"> </span>-i<span class="w"> </span>sl0<span class="w"> </span>-x<span class="w"> </span>-X<span class="w"> </span>-s<span class="w"> </span><span class="m">1500</span> |
| </pre></div> |
| </div> |
| <p>NOTE: If hardware handshake is not available, then you might try the |
| slattach option-L which is supposed to enable “3-wire operation.”</p> |
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