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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'>The TI BeagleBoard had a similar issue plaguing early revisions. I seem to recall a hardware spin on one component resolved the problem.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'>I have used both the BeagleBoard C3 and RaspPi B with Data Distribution System (real-time, UDP pub/sub messaging) when I worked at RTI.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'>I never saw any indication of the 'USB hanging' on either device. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'>I was running messages on the IP stack as fast as the CPU could process them. ...but then again, I was also using lab-grade power.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'>...recall, the class of boards being discussed are basically minimal reference designs for cell phone chips...<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:Consolas'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:Consolas'>dan<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:Consolas'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> devel [mailto:devel-bounces@ntpsec.org] <b>On Behalf Of </b>Frank Nicholas<br><b>Sent:</b> Tuesday, May 03, 2016 6:35 PM<br><b>To:</b> Hal Murray <hmurray@megapathdsl.net><br><b>Cc:</b> gpsd-dev@nongnu.org; devel@ntpsec.org<br><b>Subject:</b> Re: RaspbPi HOWTO<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>On May 3, 2016, at 6:50 PM, Hal Murray <<a href="mailto:hmurray@megapathdsl.net">hmurray@megapathdsl.net</a>> wrote:<o:p></o:p></p></div><div><div><p class=MsoNormal><o:p> </o:p></p></div></div></blockquote><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal>The problem with the Pi was USB related. I don't see troubles when using the <br>Ethernet, but WiFi hangs occasionally (days). All the USB WiFi gizmos from <br>Adafruit use the same chip. My guess is that the WiFi chip does something <br>strange and the hardware/firmware doesn't handle that case.<br><br>I've got a couple of units that use a different chip on order. That might <br>tell me something.<o:p></o:p></p></div></div></blockquote></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I have 15 Raspberry Pi’s. I’ve used the original B thru Pi 3, and the “zero". I’ve had no issues with USB. I use Gentoo on all my Pi’s. I use USB for bluetooth, WiFi & as the root partition (USB storage). I’ve used at least 5 x brands of USB WiFi adapters. I’ve pretty much standardized on “<span style='font-size:8.5pt;font-family:"Menlo",serif'>Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]</span>” as of late, but I’ve used other chip sets (from Amazon for < $10). I’ve never had any WiFi issues or USB issues.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>With regards to WiFi, if I ping a Pi, sometimes 1-3 pings fail, before the WiFi seems to "wake up". I’ve not been able to track this down to a chipset or USB specific (it happens on the Pi 3, with built-in Broadcom WiFi). All my scripts that automate things with my Pi’s that are on WiFi, start with a “<span style='font-size:8.5pt;font-family:"Menlo",serif'>ping -c 4 -q $host</span>”. ALWAYS by the 4th ping, the Pi is responding. With the Ethernet, always by the 2nd ping, the Pi is responding.<o:p></o:p></p></div></div></body></html>