cospan

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  • in reply to: Mistake in am335x-osd3358-sm-red.dts related to MPU9250 #9236
    Dave Mcospan
    Participant

      That’s interesting, I ran into an issue when I brought up my board too.

      The issue was related to threaded interrupts and that I was using an i2c interrupt controller/GPIO expander. I wrote about it here:

      https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=253429

      in reply to: Application Note for LCD #6608
      Dave Mcospan
      Participant

        Thanks for looking into the LCD panel app note. I ended up figuring out the problem… problems

        Many were self-inflicted wounds including completely flipped LCD signals due to a last minute connector part number change. Then there was a strange issue with the kernel boot sequence. For some reason the DRM (Direct Render Manager) was loading the TI LCD Controller before the panel was loading which meant that the LCD Controller didn’t find any usable panels and the LCD Controller didn’t generate /dev/fb0

        If anyone runs into this issue a quick work around would be to make the TI LCDC an external module and the panel a built in module

        Here’s a writup of the problem:

        AM335X LCD Bringup

        Dave

        • This reply was modified 6 years ago by Dave Mcospan.
        in reply to: SiP Integration Requests #6539
        Dave Mcospan
        Participant

          If you do an AM57X SIP I would like a USB-C interface. Something like the TI:TPS65981 chip with USB 3.0 and DisplayPort. This would be nice because the designer would only need to add one port to the board and they can both power the board and have an entire desktop environment using a decent USB-C hub (USB Host ports, USB Ethernet, HDMI Output). USB-C supports dual role mode so you can still boot the board over USB. If you allow the user to modify the EEPROM of the USB chip you can request up to 20V.

          in reply to: Help with Board #6376
          Dave Mcospan
          Participant

            Unfortunately the forum formatter is changing ‘<‘ to < and ‘>’ to > and ‘&’ to &

            I’m not sure how to fix this

            in reply to: Help with Board #6372
            Dave Mcospan
            Participant

              I got the kernel booted and the WIFI is working! I had to figure out some things that were a little tricky and if anyone else is working on getting WIFI up and running on a custom board here are some notes:

               

              In the DTS you should add the following (Assuming you used the exact signals that were in the App Note)

              I am not sure if this is needed for everyone but I ended up not using the dtbbuilder tool and just compiled the kernel from source, copied over the vmlinuz, System.map, dtbs kernel modules and kernel header files onto the SD card. Because of this when I first booted up I needed to run:

              sudo depmod

              once that was done I could use the instructions here:

              Setting up Beaglebone Black Wireless

              Specifically I ran the following:

              Dave

              • This reply was modified 6 years, 1 month ago by Dave Mcospan. Reason: Incorrect formatting
              • This reply was modified 6 years, 1 month ago by Dave Mcospan. Reason: Formatting
              • This reply was modified 6 years, 1 month ago by Dave Mcospan.
              in reply to: Help with Board #6323
              Dave Mcospan
              Participant

                Thanks for getting back to me.

                It turned out to be a manufacturing issue. I just got a new part put on and I’m in u-boot.

                Dave

                in reply to: Help with Board #6234
                Dave Mcospan
                Participant

                  I just saw the image of the board didn’t upload, here’s a link:

                   

                  Guppy Buddy Rev A

                   

                  Dave Mcospan
                  Participant

                    Makes sense, thanks for the clarification!

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