Booting RPi4 from USB MSD by 5.10

Ryutaroh Matsumoto ryutaroh at
Tue Jan 26 22:25:39 EST 2021

Hi all,

Just FYI, CONFIG_RESET_RASPBERRYPI=y seems necessary
when RPi4 is booted from USB MSD by the upstream kernel 5.10.x

When RPi4 is booted from an SD card,
also works well.
Related info:

By the way, when 5.10 kernel is booted from USB MSD and udisks2 is
installed, kernel emits flood of false media change messages to udev,
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

Best regads, Ryutaroh Matsumoto

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