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

[Guilherme Oliveira]

An additional info:

setting the environment variable below for u-boot solves the problem on
the u-boot CLI. To get to the CLI, I need to have and HDMI monitor and a
USB keyboard.

setenv bootdelay -2

Can someone help me adding this through ssh command line. I need to fix
an equipment that is already in field, with hard physical access to it.

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

Title:
  fan-shim interrupts u-boot

Status in u-boot package in Ubuntu:
  Confirmed

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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