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    SubjectRe: problem bring up initramfs and busybox
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    On Tue, 17 Nov 2009 10:33 +0100, "Ralf Baechle" <ralf@linux-mips.org>
    wrote:
    > On Mon, Nov 16, 2009 at 06:21:21PM -0600, myuboot@fastmail.fm 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.


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