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SubjectRe: [Regression] Missing device nodes for ETR, ETF and STM after CONFIG_UEVENT_HELPER=n

On Fri, 26 Jul 2019 12:19:25 +0200
Greg Kroah-Hartman <> wrote:

> > This somehow is not mounting etr, etf, stm devices when uevent-helper is
> > disabled. Anyways as Suzuki mentioned, using devtmpfs does fix the issue.
> Last I looked (many years ago) mdev requires uevent-helper in order for
> it to work. I recommend that if you rely on mdev to keep that option
> enabled, or to just use devtmpfs and udev :)

Since Busybox 1.31.0, mdev has gained a daemon mode. In this mode, mdev
runs in the background, and receives uevent through a netlink socket.
So there's been some changes in how Busybox mdev works in recent times.

Best regards,

Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering

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