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Log

2019-03-14

  • DevBoard showed up today; wanted to start playing with it immediately.
  • Followed the [Getting Started Guide][1] verbatim but hit some immediate roadblocks.
$ dmesg | grep ttyUSB
[11567.500409] usb 1-2: cp210x converter now attached to ttyUSB0
[11567.503236] usb 1-2: cp210x converter now attached to ttyUSB1
[11569.062428] cp210x ttyUSB1: failed set req 0x1e size 4 status: -32
[11569.062443] cp210x ttyUSB1: failed to set baud rate to 300
  • Unclear that the above faileds were actually a problem but then....
$ screen /dev/ttyUSB0 115200
[screen is terminating]
  • The Guide tells you to unplug, replug, and retry but this didn't resolve anything for me.
  • I think at the end of the day this was due to udev persmissions because sudo screen /dev/ttyUSB0 115200 got it working immediately.
  • The rest went fairly smoothly.
  • Note that if you update the hostname in /etc/hostname you should do the same in /etc/hosts otherwise you'll see a bunch of complaints about sudo not being able to resolve the hostname.
  • The first thing I tried to do that was "out of bounds" was to install a salt-minion via the standard [bootstrap script][2].
  • I quickly hit a problem there in that lsb_release reports "Mendel" even though the board is basically running Debian Stretch. More on that below in the "OS Notes" section.
  • I forced lsb_release to report what I wanted it to by using this hack.
  • Then I added the Debian Stetch sources (see next) so the bootstrap could install what it needed to.
$ cat /etc/apt/sources.list.d/debian-stretch.list
deb http://deb.debian.org/debian/ stable main contrib non-free
deb-src http://deb.debian.org/debian/ stable main contrib non-free

deb http://deb.debian.org/debian/ stable-updates main contrib non-free
deb-src http://deb.debian.org/debian/ stable-updates main contrib non-free

deb http://deb.debian.org/debian-security stable/updates main
deb-src http://deb.debian.org/debian-security stable/updates main

deb http://ftp.debian.org/debian stretch-backports main
deb-src http://ftp.debian.org/debian stretch-backports main
  • salt-minion services installed and started successfully after that.

2019-03-15

  • Decided to install OpenCV 4.0.1 from source and dealt with some challenges.
  • The dev board has <1G of RAM for compilng stuff, so this was a real issue.
  • Added a swapfile to avoid "Out of memory" errors.
sudo apt-get install dphys-swapfile
  • Gives us a 2GB swap file by default.
  • Immediately ran out of disk space.