Booting RPi4 from USB MSD by 5.10

Nicolas Saenz Julienne nsaenzjulienne at
Thu Jan 28 12:28:42 EST 2021

Hi Ryutaroh, thanks for the reports!

On Wed, 2021-01-27 at 12:25 +0900, Ryutaroh Matsumoto wrote:
> Hi all,
> Just FYI, CONFIG_RESET_RASPBERRYPI=y seems necessary
> when RPi4 is booted from USB MSD by the upstream kernel 5.10.x
> CONFIG_RESET_RASPBERRYPI=m is insufficient.

Agree I'll prepare a fix.

> 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

I'll investigate.


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