** Changed in: linux-firmware (Ubuntu)
Milestone: None => ubuntu-23.10-beta
** Changed in: linux-firmware-raspi2 (Ubuntu)
Milestone: None => ubuntu-23.10
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https://bugs.launchpad.net/bugs/1942260
Title:
compress firmware in /lib/firmware
Status in initramfs-tools package in Ubuntu:
Fix Released
Status in linux-firmware package in Ubuntu:
Confirmed
Status in linux-firmware-raspi2 package in Ubuntu:
Confirmed
Bug description:
-- initramfs-tools
[Impact]
* linux supports xz compressed linux-firmware which saves disk space.
In focal, initramfs-tools only knows how to included uncompressed
firmware files (even when kernel supports loading compressed ones).
Newer releases of linux-firmware may use compressed firmware files
only, in such cases it would be nice for focal's initramfs-tools to
support compressed firmware files in case of partial or incomplete
upgrades (i.e. linux-firmware force installed or upgraded, without
newer initramfs-tools). The proposed changes to initramfs-tools are
backwards and forwards compatible, they prefer to include uncompressed
firmware files; and if missing, include compressed firmware files in
their uncompressed form. Thus maintaining compatibility with any
kernels, irrespective of compressed/uncompressed firmware inputs.
[Test Plan]
* Compress all files shipped by linux-firmware with xz
* Rebuild initrd
* Check that all the same firmware files are still included in the
initramfs, in their uncompressed form as before
[Where problems could occur]
* This SRU is precautionary to prevent accidental installation of
compressed linux-firmware from generating incorrect initramfs. It
should be noted that whilst initramfs-tools would create a compatible
initramfs with any kernels, pre-v5.3 kernels do not support xz
compressed firmware files at runtime. Mixing this new initramfs with
compressed firmwares and pre 5.3 kernels may lead to expectations of
supporting compressed firmware files with them only working at initrd
stage and not at runtime.
[Other Info]
Original bug report
Some facts:
- The linux kernel has supported loading xz compressed firmware since 5.3
- The size of /lib/firmware in impish is ~650Mb (and growing)
- The compressed size of firmware could be ~230Mb
It would be nice to install compressed firmware to save space.
Here are the plans from the Fedora project:
https://fedoraproject.org/wiki/Changes/CompressKernelFirmware
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