3.5 PiTFT setup

Blatantly Stolen from Adafruit

ssh into your RetroPie

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curl -SLs https://apt.adafruit.com/add-pin | sudo bash
sudo apt-get update
sudo apt-get install adafruit-pitft-helper raspberrypi-bootloader
sudo adafruit-pitft-helper -t 35r
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The “curl” line can take a very long time; this is normal. Likewise with the “update.” When the adafruit-pitft-helper script asks about the console, answer 'n'.DO NOT enable the console on the PiTFT or you’ll be starting over.
Edit /boot/config.txt and change the dtoverlay line (near the end, added by the adafruit-pitft-helper script) to make it a little more responsive:

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dtoverlay=pitft35r,rotate=90,speed=64000000,fps=30
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Also while you're editing that file, add these lines at the end so the framebuffer's running at the PiTFT's native resolution:

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hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt=480 320 60 1 0 0 0
disable_overscan=1
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Install fbcp:

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git clone https://github.com/tasanakorn/rpi-fbcp
cd rpi-fbcp/
mkdir build
cd build/
cmake ..
make
sudo install fbcp /usr/local/bin/fbcp
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And edit /etc/rc.local, inserting this one line just before the final 'exit 0':

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/usr/local/bin/fbcp &
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Then 'sudo reboot' and you should have RetroPie/EmulationStation on the PiTFT!