Booting RPi4 from USB MSD by 5.10

[Ryutaroh Matsumoto]

Hi Nicolas,

I found that

>>> and almost 100% of CPU usage is consumed by udev, dbus and udisks2
>>> combined. I wonder if anyone other than me has experienced the same issue.
>>> Bug report was filed to Debian as
>>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980980

the above issue does not happen with
http://153.240.174.134:64193/kernel-deb-5.9/config-arm64-5.10.11.txt
http://153.240.174.134:64193/kernel-deb-5.9/linux-image-5.10.11-vc4patched_5.10.11-vc4patched-1_arm64.deb

It seems that
* CONFIG_RESET_RASPBERRYPI=y and boot from USB make this symptom appear.
* CONFIG_RESET_RASPBERRYPI=m, loading "reset-raspberrypi.ko" by initramfs and
  boot from USB make this symptom disappear.

best regards, Ryutaroh