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Re: [Gumstix-users] How to debug hardware problem?
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From: glamprecht <ge...@ra...> - 2012-04-04 06:31:23
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I did pull up RX. Finally after 3 days I found the problem, but still do not understand why it would not boot. I chose the most expensive PCB manufacturer for the 6 prototypes - 4 layer board. They are capable of doing 64 layers. Well so they made a mistake with the photoplotting and shorted the following lines internally to the ground plane. ETH0_CS EM_D15 EM_D12 ETH0_NCS Gerhard From: Ash Charles-2 [via Gumstix] [mailto:ml-...@n6...] Sent: 30 Maart 2012 06:49 PM To: glamprecht Subject: Re: How to debug hardware problem? Hi, If the console/RX line is floating, the OMAP boot ROM may think something is trying to communicate. This line should be high impedance. -Ash On Sun, Mar 25, 2012 at 12:03 PM, glamprecht <[hidden email]> wrote: > I've designed some of my own expander boards and manufactured 6 of them. I > have taken the Chestnut43 as basis. I also have a Chestnut43. > > On the Overo Fire after a second of power up, the middle led gives a flash > and then about 2 seconds later the blue LED starts flashing. This indicates > that it is booting up. If the reset is held in or it does not boot up the > middle LED just stays on. > > If I plug in the Overo Fire on the Chestnut43 it boots up. > > If I plug in the Overo Fire onto any of my 6 boards, the middle LED just > stays on. I presume it does not boot up. I have only populated the 3.3V > power supply and nothing else. Am I correct in saying that if only power is > applied to the 4 3.3V lines and the 4 GND lines it should start up? All the > other signals can be floating? > > Back to the Chestnut43 all works. > > To eliminate my Power Supply which I think is perfect, I have desoldered my > 3.3V regulator and cross wired the Chestnut 3.3V to my board with 1.5" 1.5mm > square cable. I have some 10uF low esr caps close to the 70 pin connectors. > Still does not work. > > I have tried adding a reset switch without any luck. > > Either my presumption that it should work with stock firmware if only 3.3V > is applied is incorrect, or there is something not shown on the Chestnut43 > schematics or there is something wrong with my 70pin connectors. > > In any case is there any way that I can use a multimeter/oscilloscope or > logic analyser connected to parts/pads on the OVERO itself to see if it is > in Reset state or not. Whether it is power-good or not? I have no problem > soldering wire wrap wire on 0402 or even smaller scale. > > Hope someone can help me. I am really stuck here. > > -- > View this message in context: http://gumstix.8.n6.nabble.com/How-to-debug-hardware-problem-tp4654354p46543 54.html > Sent from the Gumstix mailing list archive at Nabble.com. > > ---------------------------------------------------------------------------- -- > This SF email is sponsosred by: > Try Windows Azure free for 90 days Click Here > http://p.sf.net/sfu/sfd2d-msazure > _______________________________________________ > gumstix-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gumstix-users ---------------------------------------------------------------------------- -- This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users _____ If you reply to this email, your message will be added to the discussion below: http://gumstix.8.n6.nabble.com/How-to-debug-hardware-problem-tp4654354p46718 60.html To unsubscribe from How to debug hardware problem?, click here <http://gumstix.8.n6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_b y_code&node=4654354&code=Z2VyaGFyZEByYWRhcnZpc2lvbi5jby56YXw0NjU0MzU0fC0xMDI 5NDc1Njky> . <http://gumstix.8.n6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer& id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNames pace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeN amespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails %21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> NAML -- View this message in context: http://gumstix.8.n6.nabble.com/How-to-debug-hardware-problem-tp4654354p4684146.html Sent from the Gumstix mailing list archive at Nabble.com. |