On Tue, 17 Nov 2009 18:48 +0100, "Florian Fainelli" <florian@xxxxxxxxxxx> wrote: > Hi, > > On Tuesday 17 November 2009 18:39:40 myuboot@xxxxxxxxxxx wrote: > > On Tue, 17 Nov 2009 10:33 +0100, "Ralf Baechle" <ralf@xxxxxxxxxxxxxx> > > > > wrote: > > > On Mon, Nov 16, 2009 at 06:21:21PM -0600, myuboot@xxxxxxxxxxx wrote: > > > > I have been struggling to bring up a MIPS 32 board with busybox with or > > > > without initramfs. > > > > The kernel stucks there without the shell coming up. > > > > > > > > [ 1.153000] nf_conntrack version 0.5.0 (1024 buckets, 4096 max) > > > > [ 1.161000] ip_tables: (C) 2000-2006 Netfilter Core Team > > > > [ 1.167000] TCP cubic registered > > > > [ 1.170000] NET: Registered protocol family 17 > > > > [ 25.971000] Freeing unused kernel memory: 1032k freed > > > > [ 39.969000] Algorithmics/MIPS FPU Emulator v1.5 > > > > > > > > > > > > What I tried here is to use initramfs with statically linked busybox. > > > > The initramfs seems to be up, and runs the commands in the /init one by > > > > one, and then it goes to a inifite loop in r4k_wait at > > > > arch/mips/kernel/genex.S. > > > > > > r4k_wait is called by the idle loop. Which means the kernel has no > > > process > > > to run so runs the idle loop. This might be because there is no other > > > process left running or because all processes are waiting for I/O for > > > example. So it's not uncommon that even busy systems ocasionally briefly > > > run the idle loop. In other words, seeing the processor executing > > > r4k_wait does not necessarily mean something went wrong. In this case - > > > also along with the other information you've provieded it's not obvious > > > what has gone wrong. > > > > > > Ralf > > > > According to an email from Kevin, I added a symbolic link from > > switch_root to busybox. The switch_root seems to be found now based on > > the execution sequence, but I got the following error - "Kernel panic - > > not syncing: Attempted to kill init!". This is the same error when I > > tried to start the shell without initramfs. Something must be wrong, but > > I can't quite figure out. > > > > [ 9.250000] Freeing unused kernel memory: 1032k freed > > [ 10.463000] Algorithmics/MIPS FPU Emulator v1.5 > > [ 41.695000] Kernel panic - not syncing: Attempted to kill init! > > [ 41.701000] Rebooting in 3 seconds. > > > > Thanks for your help. Andrew > > > > (gdb) c > > Continuing. > > > > Breakpoint 2, do_execve (filename=0x9780a000 "/init", argv=0x943dd2bc, > > envp=0x943dd230, regs=0x97819e30) > > at fs/exec.c:1293 > > 1293 retval = unshare_files(&displaced); > > (gdb) c > > Continuing. > > > > Breakpoint 2, do_execve (filename=0x9780a000 "/sbin/switch_root", > > argv=0x4f7450, envp=0x4f7464, regs=0x97819f30) > > at fs/exec.c:1293 > > 1293 retval = unshare_files(&displaced); > > (gdb) c > > Continuing. > > If you happen to use uClibc and gcc-4.4.0 or superior, make sure that you > have > that patch applied to uClibc: http://www.mail- > archive.com/uclibc@xxxxxxxxxx/msg04483.html > -- > WBR, Florian Yes, I am using uClibc and gcc-4.4.1. So I went ahead and applied the patch on ./toolchain_build_mips/uClibc-0.9.30.1/libc/sysdeps/linux/mips/bits/syscalls.h. After that I touched ./toolchain_build_mips/uClibc-0.9.30.1/.configured and rerun make. But the result is the same - "Kernel panic - not syncing: Attempted to kill init!". Any of your suggestions will be welcome. I have tried various things such as changes in init script or using hello_world as the init, but the result is very similar. Thanks a lot. Andrew Breakpoint 1, init_post () at init/main.c:839 839 async_synchronize_full(); (gdb) enable 2 (gdb) c Continuing. Breakpoint 2, do_execve (filename=0x9780a000 "/init", argv=0x943dd2bc, envp=0x943dd230, regs=0x97819e30) at fs/exec.c:1293 1293 retval = unshare_files(&displaced); (gdb) c Continuing. Breakpoint 2, do_execve (filename=0x9780a000 "/sbin/busybox", argv=0x4f7478, envp=0x4f748c, regs=0x97819f30) at fs/exec.c:1293 1293 retval = unshare_files(&displaced); (gdb) c Continuing. ^C Program received signal SIGSTOP, Stopped (signal). r4k_wait () at arch/mips/kernel/genex.S:147 147 jr ra Current language: auto; currently asm
