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	<title>YAB &#187; ttff</title>
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	<link>http://blog.alexgirard.com</link>
	<description>Yet Another Blog</description>
	<pubDate>Wed, 26 Nov 2008 23:44:35 +0000</pubDate>
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		<title>[OpenMoko] GPS software and hardware solution</title>
		<link>http://blog.alexgirard.com/openmoko-gps-software-and-hardware-solution/</link>
		<comments>http://blog.alexgirard.com/openmoko-gps-software-and-hardware-solution/#comments</comments>
		<pubDate>Fri, 18 Jul 2008 11:15:05 +0000</pubDate>
		<dc:creator>alx</dc:creator>
		
		<category><![CDATA[Uncategorized]]></category>

		<category><![CDATA[gps]]></category>

		<category><![CDATA[hardware]]></category>

		<category><![CDATA[openmoko]]></category>

		<category><![CDATA[sdcard]]></category>

		<category><![CDATA[software]]></category>

		<category><![CDATA[solution]]></category>

		<category><![CDATA[ttff]]></category>

		<guid isPermaLink="false">http://blog.alexgirard.com/?p=202</guid>
		<description><![CDATA[The great thing about an open-source phone, like openmoko,  is that when there&#8217;s a problem, all the community can gather to find a solution.
At the beginning of the week, some people complained that they couldn&#8217;t get their phone GPS working: Time To First Fix signal (the initial signal that tell the phone where in [...]]]></description>
			<content:encoded><![CDATA[<p>The great thing about an open-source phone, like <a href="http://openmoko.com">openmoko</a>,  is that when there&#8217;s a problem, all the community can gather to find a solution.</p>
<p>At the beginning of the week, some people complained that they couldn&#8217;t get their phone GPS working: <a href="http://en.wikipedia.org/wiki/Time_to_first_fix">Time To First Fix</a> signal (the initial signal that tell the phone where in the world it is) was taking infinite time when a SD card was inserted.</p>
<p>Then some people joined <a href="http://lists.openmoko.org/pipermail/community/2008-July/021774.html">the thread on the community mailing list</a> to confirm the problem (other people joined just to complain, not helping much), and after a bunch of test, the source of the problem was confined on the SD card reader.</p>
<h2>Software solution</h2>
<p>After 24h, the OpenMoko team released a software solution to the problem, stopping the SD card reader internal clock just the time to get the TTFF signal, about 40 seconds, then everything would be back to normal.</p>
<p>The patch has been directly available on the project git repository, allowing the mos furious to recompile and reflash their phone in hours, the others waited for <a href="http://buildhost.openmoko.org/daily/">the daily build</a>. Imagine that, you get <strong>everyday a new build for your phone</strong>, without waiting for the infamous version 2.0 vaporware that might come out one day.</p>
<p>People have tested it, it works for many, but there&#8217;s still some phones that don&#8217;t have it.</p>
<h2>Hardware solution</h2>
<p>This morning, the OpenMoko hardware team published their <a href="http://www.openmoko.org/wiki/Image:Gta02_gps_10pf_rework_sop.pdf">hardware solution</a>:</p>
<p>&#8220;Soldering a 10pF capacitor between PIN5 and PIN6 at SD card slot without taking off the case as the below picture showed.&#8221;</p>
<p><img src="http://blog.alexgirard.com/wp-content/uploads/2008/07/imagen-9-300x191.png" alt="" title="Rework SOP for GPS issue of Freerunner" width="300" height="191" class="aligncenter size-medium wp-image-203" /></p>
<p>That might be a bit difficult for anyone to get access to a pico-capacitor and solder it at this tiny place, but at least it&#8217;s accessible for most of the soldering geeks.</p>
<p>So at the end, you&#8217;ve got a phone that&#8217;s so open that you&#8217;ve got a software and hardware solution of a production problem in a week. Of course, it&#8217;s not a consumer-ready phone, it would have been a complete disaster to recall all the phones, that&#8217;s just a bunch of geeks today that can touch this phone, but someday, you&#8217;ll have it in your hand, and you&#8217;ll just have to imagine all the open-source work that float inside.</p>
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