[Bug 1873520] Re: fan-shim interrupts u-boot

[Maxwell Andrews]

Disabling the UART is an option for me, as I use this USB console
(https://www.adafruit.com/product/3589) device on all my Raspberry PI
4Bs. I hacked the Pimoroni Python automatic.py file to disabled any
communication to the GPIO14 & GPIO15 pins, and even cut the stacker pins
on my header. Now, I can use the USB console and have the fan-shim's
system service switching the fan on and off under Ubuntu (Focal Fossil).

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https://bugs.launchpad.net/bugs/1873520

Title:
  fan-shim interrupts u-boot

Status in u-boot package in Ubuntu:
  New

Bug description:
  The popular pimoroni fan-shim uses the serial lines on the GPIO header
  to control an RGBLED. The default configuration of Ubuntu includes a
  serial console, which can interrupt the u-boot process with an
  appropriately timed key-press. When the fan-shim is installed, it
  effectively spams the serial console continuously with the result that
  the boot process is interrupted and lots of repeated characters appear
  on the screen.

  The workaround, for now, is to add the following line to the
  syscfg.txt file, disabling the serial port:

    enable_uart=0

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