Hi. Now I have Fedora Core 3, 2.6.11 SKAS3 patched host kernel and 2.6.10 guest kernel installed from hipl-complete.0.1.2.tar.gz using next steps in hipl-0.1.2/linux/ -folder: # make mrproper # make mrproper ARCH=um # cp ../test/configs/config-2.6.10-1.770_FC3_HIP .config I have deleted from /net/ipv6/Kconfig -file select PREEMPT -line and && X86_PC && REGPARAM=n from line: depends on IPV6 && EXPERIMENTAL && && X86_PC && REGPARAM=n # make xconfig ARCH=um I get plenty of 'trying to assing nonexisting symbol' -messages, but all necessary options (CONFIG_CLEAN_COMPILE=y, CONFIG_INET=y, CONFIG_IPV6=y, CONFIG_HIP=m etc.) exist. There is no CONFIG_REGPARAM -variable in .config. # make linux ARCH=um # make modules ARCH=um # make modules_install ARCH=um Problems start here. I tried to start UML-HIPL kernel with Fedora Core 3 root filesystem found from Strearn's website: I copied root_fs.fc-3-base.pristine.20050605.bz2 -file from http://www.stearns.org/uml-root/ and followed guides from http://www.stearns.org/uml-root/root_fs.fc-3-base.pristine.20050605.note # cp -p --sparse=always <( cat root_fs.fc-3-base.pristine.20050605.bz2 | bunzip2 -c - ) root_fs.2005060501 # chmod 644 root_fs.2005060501 I copied mkrootfs/emptyfs.swap.512.bz2 -file from http://www.stearns.org/ # cp -p --sparse=always <( cat emptyfs.swap.512.bz2 | bunzip2 -c - ) swap # chmod 644 swap # ./linux mem=160M ubd0=cow,root_fs.2005060501 ubd1=swap root=/dev/ubd/0 con=pty con0=fd:0,fd:1 I get: ... ubda: unknown partion table ubdb: unknown partion table Initializing stdio console driver messages, and UML doesn't start. I have tried also naming root filesystem as root_fs in folder where linux -file is, then: # ./linux and I get: ... ubda: unknown partition table Initializing stdio console driver Have I missed or done some point wrong? People have had these or this kind of messages in UML-users mailing list, but I can't find out solution. What root filesystems have people used with HIPL and UML or have you build your own? Thank you for help! -Teemu Väisänen