Hello, On Fri, 26 Jul 2019 12:19:25 +0200 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> 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 -- Thomas Petazzoni, CTO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com