From dad7abe725908e7693974bb18984a4e826d1f052 Mon Sep 17 00:00:00 2001 From: KemoNine Date: Tue, 11 Aug 2020 16:22:54 -0400 Subject: [PATCH] Add note about fanshim causing problems with uart during early boot that can prevent the system from starting ; tweak docs WRT armor case and fan shim, recommend fan shim over armor case as it's a more flexible solution --- docs/pimoroni_fan_shim.md | 8 ++++++++ hardware.md | 3 ++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/docs/pimoroni_fan_shim.md b/docs/pimoroni_fan_shim.md index 6e25ea1..ff476c6 100644 --- a/docs/pimoroni_fan_shim.md +++ b/docs/pimoroni_fan_shim.md @@ -9,7 +9,15 @@ sudo -sHu root # Move boot serial -> UART5 to avoid colission between UART1 and fanshim nano -w /boot/firmware/usercfg.txt # Add following to top of file + +# Enable uart5 on pins for ttyAMA1 +# Pin 32 : TX (connect to RX on adapter) +# Pin 33 : RX (connect to TX on adapter) dtoverlay=uart5 +# Turn off uart ; fanshim will break boot if this is enabled +# Further reading: https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1873520 +enable_uart=0 + nano -w /boot/firmware/cmdline.txt # switch console=serial0,115200 to console=ttyAMA1,115200 diff --git a/hardware.md b/hardware.md index 8846c22..fb8228c 100644 --- a/hardware.md +++ b/hardware.md @@ -10,8 +10,9 @@ This is a surprisingly straight forward project that has minimal in the way of h * [Geekworm Armor Case](https://geekworm.com/products/raspberry-pi-4-model-b-armor-aluminum-alloy-case-protective-shell) * If you would like an always on fan, select the model with the integrated fan option * [Pimoroni Fan SHIM](https://shop.pimoroni.com/products/fan-shim) - * This has better cooling as well as on/off support than the Geekworm Armor Case with cooling + * This has better cooling as well as on/off support * You probably want this instead of the Geekworm armor case with fans + * This will **NOT** require soldering to use but assumes you have room to slip the fan all the way down on the main header * USB to Serial adapter * There are a lot of options, choose one you know that will work well * Mini HDMI to HDMI adapter