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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Boot from Host (INT6000)</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><meta name="keywords" content="Intellon, Atheros, Qualcomm, HomePlug, powerline, communications, INT6000, INT6300, INT6400, AR7400, AR7420"><link rel="home" href="index.html" title="Qualcomm Atheros Open Powerline Toolkit"><link rel="up" href="ch04.html" title="Chapter 4. Firmware"><link rel="prev" href="ch04s11.html" title="Update Local Host (INT6000/INT6300/INT6400)"><link rel="next" href="ch04s13.html" title="Boot from Host (INT6300)"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">
Boot from Host (INT6000)
</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch04s11.html">Prev</a> </td><th width="60%" align="center">Chapter 4.
Firmware
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Boot from Host (INT6000)
</h2></div></div></div><p>
The Boot from Host operation downloads a firmware image and <acronym class="acronym">PIB</acronym> image from the local host and starts firmware execution. The process is initiated by the <span class="trademark">INT6000</span>™ <span class="application">Bootloader</span> following a device reset. The <span class="application">Bootloader</span> passes control to the <span class="trademark">INT6000</span>™ <span class="application">Softloader</span> to negotiate with the local host. The process therefore requires <span class="application">Softloader</span> aware software running on the local host in order to complete.
</p><p>
The device does not have a unique hardware address until the firmware starts and assigns one. Until that time, the <span class="application">Softloader</span> accepts messages addressed to 00:B0:52:00:00:01. In addition, the <span class="application">Softloader</span> does not know the hardware address of the local host and so it addresses <code class="constant">VS_HST_ACTION</code> messages to FF:FF:FF:FF:FF:FF; however, these messages are not forwarded over powerline.
</p><div class="figure"><a name="idp21387560"></a><p class="title"><b>Figure 4.4.
Boot from Host (INT6000)
</b></p><div class="figure-contents"><pre class="programlisting">
INT6000 LOCAL-HOST
[01] | |
[02] |-------- VS_HST_ACTION.IND -------->| [03]
[05] |<------- VS_HST_ACTION.RSP ---------| [04]
| |
[07] |<------- VS_WR_MOD.REQ -------------| [07]
[07] |-------- VS_WR_MOD.CNF ------------>| [07]
[07] |<-----------------------------------| [07]
[07] |----------------------------------->| [07]
| |
[08] |<------- VS_WR_MOD.REQ -------------| [08]
[08] |-------- VS_WR_MOD.CNF ------------>| [08]
[08] |<-----------------------------------| [08]
[08] |----------------------------------->| [08]
| |
[10] |<------- VS_ST_MAC.REQ -------------| [09]
[11] |-------- VS_ST_MAC.CNF ------------>| [12]
</pre></div></div><br class="figure-break"><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
The <span class="trademark">INT6000</span>™ <span class="application">Bootloader</span> automatically starts after device reset. It reads the <span class="application">Softloader</span> from <acronym class="acronym">NVRAM</acronym>, writes it into <acronym class="acronym">SDRAM</acronym> and starts execution. The <span class="application">Softloader</span> then manages the Boot from Host process.
</p></li><li class="listitem"><p>
The <span class="application">Softloader</span> broadcasts a <code class="constant">VS_HST_ACTION.IND</code> message every <code class="constant">500</code> milliseconds to request the download of runtime firmware and <acronym class="acronym">PIB</acronym>. The <code class="varname">HOST_ACTION_REQ</code> field of the message is 0x00 in this case. The message source address if <code class="constant">00:B0:52:00:00:01</code> as explained above.
</p></li><li class="listitem"><p>
The local host receives the <code class="constant">VS_HST_ACTION.IND</code> message and inspects the HOST_ACTION_REQ field to determine action requested. It may then elect to service the request or ignore it. On a single-host system, the host must service the request or the device will not start. On a multi-host system, one of the hosts must elect to service the request or the device will not start.
</p></li><li class="listitem"><p>
The local host sends a <code class="constant">VS_HST_ACTION.RSP</code> message to the device to indicate the ability and willingness to service the request. The MSTATUS field is set to 0x00 for affirmative and 0x01 for negative.
</p></li><li class="listitem"><p>
The <span class="application">Softloader</span> receives the <code class="constant">VS_HST_ACTION.RSP</code> from the host and inspects the MSTATUS field. On affirmative status, the <span class="application">Softloader</span> stops sending <code class="varname">VS_HST_ACTION</code> messages and waits indefinitely for the firmware image and <acronym class="acronym">PIB</acronym>.
</p></li><li class="listitem"><p>
The local host determines which firmware image and <acronym class="acronym">PIB</acronym> to download. In some cases there may be no choice. In other cases, there may be a choice between default and custom software or between current and upgraded software. This is a principle design issue to consider.
</p></li><li class="listitem"><p>
The local host downloads a firmware image to the device by sending <code class="constant">VS_WR_MOD.REQ</code> messages to the device and waiting for a <code class="constant">VS_WR_MEM.CNF</code> messages from the device after each request. Each message contains an image segment, the memory offset, the segment length and the checksum used to monitor and manage download progress. If a single transaction fails, the local host should detect it and repeat it.
</p></li><li class="listitem"><p>
The local host downloads a <acronym class="acronym">PIB</acronym> to the device by sending <code class="constant">VS_WR_MOD.REQ</code> messages to the device and waiting for a <code class="constant">VS_WR_MEM.CNF</code> message from the device after each request. Each message contains an image segement, the memory offset, the segment length and the checksum used to monitor and manage download progress. If a single transaction fails, the local host should detect it and repeat it.
</p></li><li class="listitem"><p>
The local host starts execution of the downloaded firmware by sending a <code class="constant">VS_ST_MAC.REQ</code> message to the device. The message contains the start address for the firmware.
</p></li><li class="listitem"><p>
The <span class="application">Softloader</span> receives the <code class="constant">VS_ST_MAC.REQ</code> from the local host, validates the content.
</p></li><li class="listitem"><p>The <span class="application">Softloader</span> sends a <code class="constant">VS_ST_MAC.CNF</code> message to the local host to indicate an ability or willingness to start execution. Assuming an ability and willingness, the <span class="application">Softloader</span> immediately starts firmware execution which relinquishes device control to the firmware.
</p></li><li class="listitem"><p>
The local host receives the <code class="constant">VS_ST_MAC.CNF</code> message from the device, inspects the MSTATUS field and acts accordingly. Assuming an affirmative status, this process terminates.
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