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

[Dimitri John Ledkov]

it does feel too many that it should be included by default, not sure
why the rest of the tty/serial drivers are not included, or how come
this one is not scoped under usb/hid, it is fairly small, and built on
arm64 only i think, thus it is useful to include by default - as at best
it is unlikely to impact initrd sizes much, and expanding support of
generic kernels on arm64 is very much in scope for Ubuntu.

** Project changed: initramfs-tools => initramfs-tools (Ubuntu)

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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:
  New

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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