Recently I did an upgrade to the mainline rt kernel 4.1, following this instructions https://github.com/beagleboard/bb.org-overlays/blob/master/readme.md.
The upgrade process went well and after boot I was unable to access the board via usb ethernet. In fact the interface shows up as eth2 on my linux box, so I typed ifconfig eth2 up 192.168.7.1.
Access was regained but after a while the interface will loose the ip address. So I had to reissue the ifconfig eth2 up command time after time.
Another thing is that the pru was not enabled. This kernel has support for prussdrv? I tried to copy my old boneblack.dtb but I found out that it was not compatible… also I found two locations for dtb, one under /boot/dtbs and another at /boot/udev/dtbs… which one should I use?
Thank you very much