[Bug 1187616] [NEW] udev firmware handler needs to support multiple firmware sources for Ubuntu Touch

[Steve Langasek]

Public bug reported:

Currently, udev has a hardcoded firmware search path of /lib/firmware.
This prevents it from being usable to load all firmware on ubuntu touch
images, which necessarily have separate partitions for vendor-provided
firmware vs. system-provided firmware - we can't expose both of these
sets of firmware in /lib/firmware.  So to address this, udev would need
to be configured to search more than one firmware path.  This appears to
be supported using a space-separated list of directories as the argument
to --with-firmware-path.

The logical directories to search in an Ubuntu Touch context would be
/lib/firmware, /system/firmware, and /vendor/firmware.  If we want to
avoid the latter two as being non-standard directories, we can use bind
mounts or symlinks to the appropriate places and only search "standard"
directories like /lib/firmware and /usr/local/lib/firmware.  But at
minimum we need one extra search path.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1187616

Title:
  udev firmware handler needs to support multiple firmware sources for
  Ubuntu Touch

Status in “systemd” package in Ubuntu:
  New

Bug description:
  Currently, udev has a hardcoded firmware search path of /lib/firmware.
  This prevents it from being usable to load all firmware on ubuntu
  touch images, which necessarily have separate partitions for vendor-
  provided firmware vs. system-provided firmware - we can't expose both
  of these sets of firmware in /lib/firmware.  So to address this, udev
  would need to be configured to search more than one firmware path.
  This appears to be supported using a space-separated list of
  directories as the argument to --with-firmware-path.

  The logical directories to search in an Ubuntu Touch context would be
  /lib/firmware, /system/firmware, and /vendor/firmware.  If we want to
  avoid the latter two as being non-standard directories, we can use
  bind mounts or symlinks to the appropriate places and only search
  "standard" directories like /lib/firmware and /usr/local/lib/firmware.
  But at minimum we need one extra search path.

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