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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Leigh,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I’ve tested the TFP-401 with the with the correct level shifters implemented on the MinnowBoard Max and it made no difference to functionality. We did use a HDMI/DVI
analyzer on the board and verified the correct levels were implemented(on the modified board). The specific issue at hand appears to be related to how the video controller handles the DVI (not HDMI) legacy modes. I was able to replicate this issue using a
NUC (which does have the correct level shifters). Once I upgraded the firmware on the NUC the issue went away…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">No schedule for A4 has been announced yet…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dave<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<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"> elinux-MinnowBoard [mailto:elinux-minnowboard-bounces@lists.elinux.org]
<b>On Behalf Of </b>Leigh Gawne<br>
<b>Sent:</b> Sunday, June 7, 2015 1:01 PM<br>
<b>To:</b> MinnowBoard Development and Community Discussion<br>
<b>Subject:</b> Re: [MinnowBoard] HDMI level shifters and revision A4<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi Dave,<o:p></o:p></p>
<p>Thanks for the info, however in my case I must say this does not look like the firmware issue mentioned below - I have tested this with UEFI and coreboot/seaBIOS and this makes no difference, unlike that stated in the ticket.
<o:p></o:p></p>
<p>Based on the fact that there is a known issue (<a href="https://bugzilla.yoctoproject.org/show_bug.cgi?id=7027">https://bugzilla.yoctoproject.org/show_bug.cgi?id=7027</a>) with the HDMI interface being out of spec and with the testing I have done everything
points at a hardware problem. Some boards just about work, others don't at all. EDID is all working fine. Unless the HDMI drive strengths or levels can be adjusted by software, then I can't see how a firmware fix would improve anything here, any thoughts?
<o:p></o:p></p>
<p>Hence back to my earlier question about the A4 revision of the board with proper HDMI compliant signals - is this available yet? If so I can very easily check to see if this solves my problem.
<o:p></o:p></p>
<p>Thanks,<o:p></o:p></p>
<p>Leigh<o:p></o:p></p>
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<p class="MsoNormal">On 7 Jun 2015 18:34, "Anders, David" <<a href="mailto:david.anders@intel.com">david.anders@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Leigh,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">See this bug report:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://bugzilla.yoctoproject.org/show_bug.cgi?id=7719" target="_blank">https://bugzilla.yoctoproject.org/show_bug.cgi?id=7719</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">specifically the TFP401 and TFP501 chips from TI are not working with the MinnowBoard Max. the issue
appears to be a firmware , not hardware issue, and is being worked on…</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dave</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><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"> elinux-MinnowBoard [mailto:<a href="mailto:elinux-minnowboard-bounces@lists.elinux.org" target="_blank">elinux-minnowboard-bounces@lists.elinux.org</a>]
<b>On Behalf Of </b>Leigh Gawne<br>
<b>Sent:</b> Sunday, June 7, 2015 2:43 AM<br>
<b>To:</b> MinnowBoard Development and Community Discussion<br>
<b>Subject:</b> Re: [MinnowBoard] HDMI level shifters and revision A4</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p>Hi Dave,<o:p></o:p></p>
<p>I am using the TI TFP401 as the DVI decoder. <o:p></o:p></p>
<p>I thought about spinning another revision of the board with an additional level shifter, but given that these are present on the A4 revision, my preference is just to get this revision and everything should play nice.<o:p></o:p></p>
<p>Thanks,<o:p></o:p></p>
<p>Leigh<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On 6 Jun 2015 11:21 pm, "Anders, David" <<a href="mailto:david.anders@intel.com" target="_blank">david.anders@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Leigh,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">We have found that there are some DVI receiver chips that are of issue with the minnowboard max. which chipset are you using to covert from HDMI/DVI
to LVDS?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Dave</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> elinux-MinnowBoard [mailto:<a href="mailto:elinux-minnowboard-bounces@lists.elinux.org" target="_blank">elinux-minnowboard-bounces@lists.elinux.org</a>]
<b>On Behalf Of </b>Leigh Gawne<br>
<b>Sent:</b> Saturday, June 6, 2015 6:46 AM<br>
<b>To:</b> <a href="mailto:elinux-minnowboard@lists.elinux.org" target="_blank">elinux-minnowboard@lists.elinux.org</a><br>
<b>Subject:</b> [MinnowBoard] HDMI level shifters and revision A4<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Hi guys,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">I have a customised daughterboard for the Minnoxboard Max which includes an HDMI to LVDS subsystem. During test, I have found that some boards are unable to drive
the connected LCD display panel. Further investigation leads me to believe that it is the missing level shifters on the Minnowboard Max which mean that this is not working as expected (connecting other HDMI sources to the board, i.e. PC, etc. work absolutely
fine. Inspection of the diff pair levels on a scope shows that it is definitely marginal).
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">I understand that revision A4 of the board (<a href="https://bugzilla.yoctoproject.org/show_bug.cgi?id=7027" target="_blank">https://bugzilla.yoctoproject.org/show_bug.cgi?id=7027</a>)
will include these level shifters. My question is whether this revision of the board is available yet, and if so, how I couple go about ordering a couple of them for test to ensure it solves my problem. I purchase around 10 boards around a month or so ago,
and these are all revision A2.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Any insights or additional information would be most helpful.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-GB">Leigh</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><br>
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<a href="http://lists.elinux.org/mailman/listinfo/elinux-minnowboard" target="_blank">http://lists.elinux.org/mailman/listinfo/elinux-minnowboard</a><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
_______________________________________________<br>
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<a href="http://lists.elinux.org/mailman/listinfo/elinux-minnowboard" target="_blank">http://lists.elinux.org/mailman/listinfo/elinux-minnowboard</a><o:p></o:p></p>
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