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	<title>Dangerous Prototypes &#187; issues</title>
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		<title>Bus Pirate bootloader bug</title>
		<link>http://dangerousprototypes.com/2010/01/05/bus-pirate-bootloader-fail/</link>
		<comments>http://dangerousprototypes.com/2010/01/05/bus-pirate-bootloader-fail/#comments</comments>
		<pubDate>Tue, 05 Jan 2010 13:32:06 +0000</pubDate>
		<dc:creator>Ian</dc:creator>
				<category><![CDATA[Bus Pirate]]></category>
		<category><![CDATA[bootloader]]></category>
		<category><![CDATA[issues]]></category>

		<guid isPermaLink="false">http://dangerousprototypes.com/?p=2976</guid>
		<description><![CDATA[
There is nothing wrong with the Bus Pirate, this will only effect future firmware upgrades. 
There&#8217;s an erase issue with the AN1157 bootloader used in all Bus Pirate versions. So far it&#8217;s not been a problem because it only effects an unused section of memory, but the next firmware release might require that space. The [...]]]></description>
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<p><em>There is nothing wrong with the Bus Pirate, this will only effect future firmware upgrades. </em></p>
<p>There&#8217;s an <a href="http://dangerousprototypes.com/2009/08/06/bus-pirate-firmware-upgrades-on-linux-osx/#comment-1515">erase issue</a> with the <a href="http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&amp;nodeId=1824&amp;appnote=en533906">AN1157</a> bootloader used in all Bus Pirate versions. So far it&#8217;s not been a problem because it only effects an unused section of memory, but the next firmware release might require that space. The translated versions already use it. There&#8217;s a risky procedure that will clear the entire chip, but it&#8217;s 100% guaranteed to brick your Bus Pirate if something goes wrong.</p>
<p>The bottom line is that a bootloader update is needed if the firmware grows much larger, we need to reclaim that space (up to 6KB). Normally a bootloader upgrade requires a &#8216;real&#8217; PIC programmer, but we can deploy the GPL&#8217;d <a href="http://mrmackey.no-ip.org/elektronik/ds30loader/">ds30 Loader</a> (also used in the <a href="http://dangerousprototypes.com/2009/12/11/prototype-web-platform/">web platform</a>) using the existing bootloader. Bootloader upgrades for everyone! But not yet! There&#8217;s still some issues. Additional details to follow.</p>
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