Public bug reported:

When attempting to boot the Ubuntu 24.04 image on an eMMC variant of the
CM5, attached to a CM4 I/O carrier board, the boot hangs fairly early
on, just presumably at the point it attempts to mount the "real" root.
The following error message is repeated on the console:

[   14.648143] mmc0: mmc_select_hs400 failed, error -84
[   14.653123] mmc0: error -84 whilst initialising MMC card

This occurs with both the noble release kernel (6.8.0-1004.4), and with
an image built from up to date sources using the noble-updates kernel
(6.8.0-1015.17). I haven't managed to test the noble-proposed kernel
(6.8.0-1016.18) yet.

The issue doesn't occur with the oracular image (with kernel
6.11.0-1004.4).

I'll attach the output from the serial console from as far as it got.

** Affects: linux-raspi (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "mmc-failure.log"
   
https://bugs.launchpad.net/bugs/2089555/+attachment/5840250/+files/mmc-failure.log

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https://bugs.launchpad.net/bugs/2089555

Title:
  mmc0 error on boot with eMMC CM5

Status in linux-raspi package in Ubuntu:
  New

Bug description:
  When attempting to boot the Ubuntu 24.04 image on an eMMC variant of
  the CM5, attached to a CM4 I/O carrier board, the boot hangs fairly
  early on, just presumably at the point it attempts to mount the "real"
  root. The following error message is repeated on the console:

  [   14.648143] mmc0: mmc_select_hs400 failed, error -84
  [   14.653123] mmc0: error -84 whilst initialising MMC card

  This occurs with both the noble release kernel (6.8.0-1004.4), and
  with an image built from up to date sources using the noble-updates
  kernel (6.8.0-1015.17). I haven't managed to test the noble-proposed
  kernel (6.8.0-1016.18) yet.

  The issue doesn't occur with the oracular image (with kernel
  6.11.0-1004.4).

  I'll attach the output from the serial console from as far as it got.

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