[Bug 2019435] Re: Default initramfs is missing qcom_geni_serial module

[Benjamin Drung]

dracut is installing "=drivers/tty/serial" (see modules.d/90kernel-
modules/module-setup.sh). So we can just do the same in initramfs-tools.

** Changed in: initramfs-tools (Ubuntu)
   Importance: Undecided => Medium

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Triaged

** Changed in: initramfs-tools (Ubuntu)
     Assignee: (unassigned) => Benjamin Drung (bdrung)

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https://bugs.launchpad.net/bugs/2019435

Title:
  Default initramfs is missing qcom_geni_serial module

Status in initramfs-tools package in Ubuntu:
  Triaged

Bug description:
  Running Ubuntu 22.04 with the HWE kernel (5.19.0-38-generic
  #39~22.04.1-Ubuntu) on a Qualcomm RB5 derived product -
  https://developer.qualcomm.com/qualcomm-robotics-rb5-kit

  The platform has a USB to serial port that can be used as the Linux
  console.  However, this requires the qcom_geni_serial driver to
  operate.  That driver is available as a built module already, but only
  on the rootfs.  It is not included in the initramfs by default.

  The problem with this is that the console is activated quite late in
  boot, which reduces it's usefulness in debugging kernel/boot issues.
  Also, when it finally does come up, the console cannot operate as a
  login interface (no login prompt is provided) because the interface is
  initialized after systemd is operational.

  I can manually add the module to the initramfs by adding
  "qcom_geni_serial" to /etc/initramfs-tools/modules and running update-
  initramfs, however this is quite inconvenient.  It requires me to
  remove the storage from the platform, and modify it on another system.

  Given that the default initramfs already contains a large number of
  serial drivers, it feels like qcom_geni_serial should be included by
  default which would give an optimal "out of the box" experience on a
  number of Qualcomm based platforms.

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