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

[Guilherme Oliveira]

In my case, I read a one-way communication coming from a power meter on
the uart. Since I can't control the flow of data coming and also need to
have uart enabled, how can I work arround?

Is is possible to set enable_uart=0 on /boot/firmware/usercfg.txt and
after boot use a script to reenable it?

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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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