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

[Dave Jones]

Closing as won't fix: the serial console is too important to disable by
default on our server images, and there's nothing we can realistically
do about a piece of hardware that attached to the serial pins that spams
the serial console as a result (u-boot *should* be interruptible by key-
press after all).

This is *less* of an issue in 22.04 as u-boot is not in the boot
sequence there, but the boot screen will still flicker on that release
as plymouth perceives the escape key being repeatedly pressed on the
serial console, so the work-around still applies there (change
enable_uart to 0 in config.txt).

** Changed in: u-boot (Ubuntu)
       Status: Confirmed => Won't Fix

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

Title:
  fan-shim interrupts u-boot

Status in u-boot package in Ubuntu:
  Won't Fix

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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