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Since systemd also used tmpfs we should make a similar patch for the systemd-udev script Fix for bug: https://bugzilla.yoctoproject.org/show_bug.cgi?id=4632 Since udev 172, the 'mknod' logic was removed from udev. Yocto Dylan is now using udev 182. This means /dev is now required to be a devtmpfs filesystem (maintained by the kernel). If the root filesystem is a ramdisk, the kernel's auto-mount of /dev doesn't activate since there is no rootfs to actually mount... The bug causes an unusable system as /dev doesn't contain even basic nodes required to even get a login prompt. The Yocto udev/init script mounts tmpfs if it does not detect tmpfs or devtmpfs mounted at /dev. This appears to be outdated logic that is no longer correct. I believe the Yocto udev init script should be checking and mounting only 'devtmpfs' on dev. (From OE-Core master rev: d3616f31617830cac9375e8f4aa33e344ac554ed) (From OE-Core rev: 20b50e8d99fa58818a23d3e82411ac1691e6552d) Signed-off-by: Alex Olson <alex.olson+yocto@gmail.com> [YOCTO #4632] Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>