Hi Juergen, 2014-09-01 15:20 GMT+02:00 Juergen Borleis <j...@pengutronix.de>: > Hi Guillermo, > > On Monday 01 September 2014 13:11:48 Guillermo Rodriguez Garcia wrote: >> I am playing around to see if I can replace udev with mdev for the >> mini2440. >> >> Most of it is working but as soon as I remove udev, I also lose the >> /dev/fd, /dev/stdin, /dev/stdout, /dev/stderr entries > > Are you sure, you need these entries? It seems to me it is used in very rare > cases.
I am not really sure. Initially I was just comparing the /dev tree after moving from udev to mdev, to identify potential issues. I noticed these nodes were missing and could not find where they were being created. I was then surprised to see that these are specialcased by udev (see [1] for version 182 which is the one used by the Mini2440 BSP) I don't really know if I need these entries but the fact that they are handled specially by udev makes me wonder. Also I know that bash uses /dev/fd for process substitution ,e.g. you can try: $ echo >(true) Anyway I need an init script for mdev (to tell the kernel to use it for hotplug events, and also for the initial coldplugging). Since I will need to write this script anyway, I can just create these nodes there. [1] http://git.kernel.org/cgit/linux/hotplug/udev.git/tree/src/udevd.c#n960 Best, Guillermo
