Hi~ i have some questions again. my building sequence is : ====================================== in l4_all/kernel/fiasco 1. make BUILDDIR=../../build/fiasco in l4_all/build/fiasco 2. make menuconfig in l4_all/l4 3. make config O=../build/l4env 4. make O=../build/l4env ====================================== my questions : 1. when i issue make in l4/ to build the L4 userland, does it automatic build fiasco subsequently？ 2. if yes, is its default output path for fiasco l4_all/kernel/fiasco/build? ( after the operations mentioned above, i find there are some new files in l4_all/kernel/fiasco/build ) but my configuration for fiasco is in l4_all/build/fiasco, is this auto build operation based on my config? or i should set BUILDDIR to l4_all/kernel/fiasco/build? when config l4linux: according to http://os.inf.tu-dresden.de/L4/LinuxOnL4/build-2.6.shtml, there are some options we shouldn't enable ex: like ACPI, SMP, preemption, apic/ioapic, HPET, highmem, MTRR, MCE, power management and similar. 1. does those options are default unable? or we should unable manually? 2. what does "similar" mean? thanks for answering.