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   REPLYADDR theom+news@chiark.greenend.org.uk   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  f56a0e95   
   REPLY:  1c4cf98b   
   PID: SoupGate-Win32 v1.05   
   Bryan  wrote:   
   >   
   > Ok, I do see the lite version SHOULD boot from uSD, so perhaps this is a   
   > problem with the actual OS version as well. There's also this little bit   
   > of info with some changes to config.txt:   
   >   
   > https://www.waveshare.com/wiki/Wrote_Image_for_Compute_Module_   
   oards_Lite_version   
   >   
   > which I'll try.   
      
   This in config.txt:   
   dtoverlay=dwc2,dr_mode=host   
      
   (there should not be a dot on the end)   
      
   overrides the USB 2 port into host mode, ie to accept USB sticks etc.  I   
   suppose that could be a reason why your CM4 won't USB boot.  Ordinarily the   
   port can detect whether to be in host or device more via the 5th pin on the   
   micro USB connector, which is tied low in an OTG adapter to force host mode.   
   Maybe your board doesn't do this correctly?  Of course, if you can't boot   
   you can't read config.txt to force the port to the right direction, so   
   you'd have to rely on the pin being tied low.   
      
   Even without this, and even with no SD, I'd expect to see some sign of life   
   on the HDMI: the Pi4 should display a 'BIOS' style boot screen that says   
   what it's trying to boot from.   
      
   > I don't have a lot of information on the carrier itself, that seems to   
   > be somewhat lacking. Maybe the carrier is bad, being a Super High   
   > Quality Much Goodly Chinese device, who knows? There are reviews of it   
   > out there, but no real hard information. I'll dig into that as well.   
   >   
   > The local Micro Center has a cheap carrier in stock of a different   
   > style, so I'm going to pick up one of those this weekend and give that a   
   > try as well, but I'll grab an older OS first to see how that goes.   
      
   Good plan.  Once you can get anything working, you can then take deltas   
   against the setup you have to narrow down the problem.  If absolutely   
   nothing works then there are few clues.   
      
   Theo   
      
   --- SoupGate-Win32 v1.05   
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