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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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