Am 26.09.2013 13:57, schrieb Ramkumar Ramachandra: > Richard Weinberger wrote: >>> $ file linux >>> linux: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), >>> dynamically linked (uses shared libs), for GNU/Linux 2.6.32, not >>> stripped >>> $ ./linux ubd0=busybox-rootfs >>> [...] >>> Kernel panic - not syncing: No init found. Try passing init= option >>> to kernel. See Linux Documentation/init.txt for guidance. >> >> I don't know that rootfs but it looks like there is no init. > > Ofcourse there's an init on the busybox-rootfs, and I'm able to boot > it with an x86_64 Linux. The reason for panic is incorrect: I think > (although not sure) a 32-bit rootfs userland will work. A 32Bit UML kernel can run 32Bit users, a 64Bit UML kernel can only run 64Bit userland. We have no 32Bit compat layer on x86_64. Patches are welcome. >>> [1] 25526 abort (core dumped) linux ubd0=busybox-rootfs >>> % >>> >>> Rubbish. >> >> UML core dumps at panic() by design. > > On a related note, why does it screw up my terminal? I have to `reset` > to get a nice working terminal. I really don't know. That is not by design. >> Seriously, my plan is to get rid of SUBARCH, that's why I did not push your patches >> upstream and I've send the rid of SUBARCH patch series. >> It turned out that other archs depend on SUBARCH too therefore some more thinking is needed. >> Time passed, merge window closed, $dayjob needed some attention... > > Don't let some grand plan stall reasonable patches that fix immediate problems. > >> That said, your "arch/um: make it work with defconfig and x86_64" patch is also not perfect. >> "make defconfig ARCH=um SUBARCH=x86" will create x86_64 defconfig, which is wrong and breaks existing >> setups. > > Wrong. > > $ make defconfig ARCH=um SUBARCH=i386 > *** Default configuration is based on 'i386_defconfig' > # > # configuration written to .config > # I wrote "SUBARCH=x86" *not* SUBARCH=i386. Again, if SUBARCH=x86 works too I'll happily merge it. But as of now it breaks existing setups. Thanks, //richard
