Moin! When I try to compile 2.6.15.2 with ARCH=um and I did before "make clean" and "make ARCH=um menuconfig", it aborts due to this error: include/linux/jiffies.h:39:7: warning: "CONFIG_HZ" is not defined include/linux/jiffies.h:42:3: error: #error You lose. This repeats many many times. What information do you need? (Please cc-me on reply no nico-kernel2@...) Nico -- Latest release: ccollect-0.3.1 (http://linux.schottelius.org/ccollect/) Open Source nutures open minds and free, creative developers.