[Bug 2064208] Re: Installer crashes when booting from USB on Raspberry Pi

[Dave Jones]

** Changed in: ubiquity (Ubuntu)
       Status: New => Triaged

** Changed in: ubiquity (Ubuntu)
   Importance: Undecided => High

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Title:
  Installer crashes when booting from USB on Raspberry Pi

Status in ubiquity package in Ubuntu:
  Triaged

Bug description:
  After writing the Ubuntu 24.04 Desktop for Raspberry Pi image to an
  SSD drive with a USB3 interface (specifically; this issue does not
  occur when booting from an SD card), booting the drive on a Pi 4 or Pi
  5, and running through the installer to the point where the
  (corrupted) slide deck starts to display during setup, the installer
  crashes.

  [ Workaround ]

  At the time of writing, some workarounds have been found, but none
  that consistently work on all boards with all drives. One workaround
  that has worked on a Pi with a Samsung EVO SSD, and a Crucial SSD is
  as follows:

  Before booting the image, find config.txt on the boot partition, and
  the "dtoverlay=vc4-kms-v3d" line within it. There will be two of these
  lines, you want the first one under an "[all]" section. Append
  ",cma-128" to the line. Specifically, the following section:

    dtoverlay=vc4-kms-v3d
    disable_fw_kms_setup=1

  Should become:

    dtoverlay=vc4-kms-v3d,cma-128
    disable_fw_kms_setup=1

  Unmount the drive cleanly, boot it, and run through the installer. You
  may revert the change (if you wish) after successful installation.

  Another workaround, reported as working on a Pi 5 with an NVMe drive
  attached over PCIe:

  Before booting the image, find config.txt on the boot partition. Under
  the first "[all]" section append the following line:

    dtparam=pciex1

  Unmount the drive cleanly, boot it, and run through the installer.

  Please note both workarounds have also been reported as failing with
  certain drive combinations.

  [ Background ]

  Given this crash occurs immediately upon the (corrupted) slide deck
  starting, that it only occurs when booting from USB (but the exact
  same image works from an SD card), and that merely changing the pre-
  allocation of the contiguous memory area affects it, I suspect this at
  least related to (if not a duplicate of) LP: #2037015, particularly
  since a crash bug is now associated with it too, LP: #2062146.

  Still, I'll leave this open as a non-duplicate for now as I'm not
  positive of root-cause yet.

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