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New CM3+
#1
Just curious if anyone has tried out the New CM3+ yet? I ordered mine from Adafruit last night so it should be here next week sometime in assuming. I definitely noticed a positive difference when I went from the original Pi 3b to the Pi 3b+ so I'm curious to see if I get them with the new CM3+. At the very least the new heat spreader should be pretty beneficial, at least for me anyway because I still get some substantial heat even with the fan on the L2 R2 board. Never to the point of thermal shutdown but better heat management is never a bad thing .
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#2
We just got a new CM3L+ in yesterday.  It can be made to work, but it's not as straightforward as you might think.  I think that'll get better when the updates get into apt.

The new CM3+ is clocked at the same max clock rate as the normal CM3.  It is better at using less power and better at dissipating heat.

If you want to try your module out, you will first need to fully update your system.  I'd definitely suggest making a IMG backup of your SD before you do this.

Minimally, you might be able to get by with these steps.

For anyone reading this after February 2019, I would guess that you can just update using the built-in RetroPie updates at some point, so I wouldn't recommend going this route unless you HAVE to.  rpi-update and rpi-source will grab stuff from outside of the apt/Raspbian control scheme.

sudo apt install rpi-update
sudo rpi-update

In theory, after that, you could shut down, pop in the new module, and start up the system.  The button driver will likely NOT work.  To rebuild and install it for the new kernel, do this.


ls /usr/src/

Look for the newest number behind mk_arcade_joystick_rpi.  If it's not 0.1.5.7, change this next command accordingly.


sudo apt install -y --force-yes dkms cpp-4.7 gcc-4.7 joystick raspberrypi-kernel raspberrypi-kernel-headers wiringpi
dkms install -m mk_arcade_joystick_rpi -v 0.1.5.7

If it complains about missing kernel headers, then you need those.  You can get them like this.

sudo apt install libncurses5-dev bc
sudo wget https://raw.githubusercontent.com/notro/...rpi-source -O /usr/bin/rpi-source && sudo chmod +x /usr/bin/rpi-source && /usr/bin/rpi-source -q --tag-update

Then try this again,
dkms install -m mk_arcade_joystick_rpi -v 0.1.5.7
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#3
Thank you so much for your extremely detailed and beyond helpful reply. I think it'll be here today so I'm gonna give it a go hopefully this afternoon. I figured it wasn't going to be a simple swap and go but it would have been a nightmare to try and figure out on my own, so again thank you. Now I can stop being lazy and get the brightness controller and at least one analog stick installed along with it as I've been procrastinating hard on that front.
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