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I have just upgraded to the latest OS Raspbian Pixel and my serial connection has stopped working. I know that the hardware is configured correctly as it worked pre-update. I have updated to the latest firmware as well.

sudo apt-get update
sudo apt-get upgrade
sudo rpi-update

I have verified that the pi3 is getting serial information. I have employed the dtoverlay=pi3-disable-bt in the /boot/config.txt.

The /boot/cmdline.txt it is as follows:

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles

I have then run

sudo systemctl disable hciuart

Running minicom

sudo minicom -D /dev/ttyS0 -b19200

yields no results. I have already read all the posts, like this one, How do I make serial work on the Raspberry Pi3 and tried everything to no avail. Thank you for your help.

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Ray Troy
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  • Have you tried /dev/ttyAMA0?? If you switched the ports with the .dt overlay, ttyS0 would be the bluetooth module. – goldilocks Nov 07 '16 at 20:01
  • @goldilocks sudo minicom -D /dev/ttyAMA0 -b19200 yields an error minicom: cannot open /dev/ttyAMA0: No such file or directory – Ray Troy Nov 07 '16 at 20:04
  • Well, they've done something new and wacky then (read the section about pi3-disable-bt in /boot/overlays/README.txt). There should be /dev/serial0 and serial1 symlinks, see which nodes they link to. – goldilocks Nov 07 '16 at 20:07
  • @goldilocks yes. I have even tried sudo minicom -D /dev/serial0 -b19200 minicom: cannot open /dev/serial0: No such file or directory – Ray Troy Nov 07 '16 at 20:10
  • Unfortunately you have tried too many things. See "In normal circumstances there is NEVER a need to run rpi-update as it always gets you to the leading edge firmware and kernel and because that may be a testing version it could leave your RPi unbootable". https://www.raspberrypi.org/forums/viewtopic.php?p=916911#p916911 What does ls -l /dev/ser* show – Milliways Nov 07 '16 at 23:07
  • @Milliways after running that command it states lrwxrwxrwx 1 root root 7 Nov 8 08:28 /dev/serial0 -> ttyAMA0 lrwxrwxrwx 1 root root 5 Nov 8 08:28 /dev/serial1 -> ttyS0 – Ray Troy Nov 08 '16 at 13:38
  • After reinstalling NOOBS and NOT running rpi-update I get output on the ttyAMA0 in minicom. – Ray Troy Nov 08 '16 at 13:43

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