[Bug 2073835] Re: Default kernel commandline options on Raspberry Pi

[Heinrich Schuchardt]

boot.scr is only relevant when booting via U-Boot. In this case
/boot/firmware/cmdline.txt is not considered.

We still need a place to define the default command line. As you already
described this is /usr/share/flash-kernel/default/flash-kernel when
booting via flash-kernel's boot.scr. Documenting this file in the flash-
kernel man-page would be helpful.

When booting via U-Boot and GRUB the kernel command line is set in
/etc/default/grub*. Here cmdline.txt is ignored, too.

The suggested documentation fix should be introduced via
salsa.debian.org.

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https://bugs.launchpad.net/bugs/2073835

Title:
  Default kernel commandline options on Raspberry Pi

Status in flash-kernel package in Ubuntu:
  New

Bug description:
  This is Pi specific. The problem is that in older releases where we
  use u-boot in the Ubuntu raspi images, flash-kernel uses default
  kernel commandline options 'quiet splash' (from /usr/share/flash-
  kernel/default/flash-kernel) which end up hard-coded in
  /boot/firmware/boot.scr, specifically this line:

  setenv bootargs " ${bootargs} quiet splash"

  This line basically extends the kernel commandline options specified
  in /boot/firmware/cmdline.txt. On Pi, there should only be one place
  to specify kernel options and that's cmdline.txt, u-boot/flash-kernel
  should not modify or extend these options.

  We recently had a customer issue where we needed to enable kernel
  logging over the serial console which required modification of
  cmdline.txt *and* rebuilding boot.scr to drop 'quiet splash'. We
  should not have to touch boot.scr for this.

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