(11 Mar 2026)

My P550 machine using "Sabrent Rocket M.2" fails to boot with the
"unified kernel" (soon to be renamed as "omni kernel"):

    https://copr.fedorainfracloud.org/coprs/g/forge-riscv-members/riscv64_unified_kernel

We debugged this on the Fedora RISC-V Matrix channel and got the end of
it: the problem seems to be NVMe specific (Sabrent Rocket M.2):

I had to turn off PCIe Active State Power Management (ASPM) for the
kernel to boot:

    pcie_aspm=off

(Thanks to Jason Montleon for the suggestion.)


To make it persistent across kernel updates:

    $ grubby --update-kernel=ALL --args='pcie_aspm=off'

    (Or: GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub)


Jason pointed me to this related LKML thread:
https://lkml.org/lkml/2025/11/13/2065  

            * * *

The other ideas that we tried:

- Rename the `options root=$UUID ...` UUID to `options
  root=/dev/nvme0n1p3 ...`  in `/boot/loader/entries/*unified*.conf`
  file to no avail.

- `rd=shell rd.timeout=20` or `emergency` (shortcut for systemd's
  emergency unit) in the Grub menu fails to bring an emergency shell;
  same story with `init=/bin/bash`.

- Finanlly, this brings the rescue shell: "rdinit=/bin/bash" (note, the
  'rdinit' vs. 'init' difference), but it won't mount enough things to
  be useful.