Re: initramfs /init freeze

[Mike Frysinger <vapier@gentoo.org>]

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On Monday 28 April 2008, Kristoffer Ericson wrote:
> On Mon, 28 Apr 2008 21:04:49 "Roni Feldman" wrote:
> > I'm experiencing odd behavior on an SH4 setup: I have an embedded
> > initramfs in the kernel image.
> > The kernel boots fine but the sequence freezes after
> > run_init_process("/init") is executed.
> >
> > I say "freeze" because I tried code that only does "return 0;" and I
> > even wrote an init.s with
> > a _start function that jmp's to address 0 (and was supposed to cause
> > an exception, but nothing
> > appeared in ttySC1, not even a panic for the exit of the init process).
> >
> > All the printk()'s are visible, and the console handover from sercon0
> > to ttySC1 seems to work
> > fine (I have no trouble doing printk's before the call to kernel_execve).
> >
> > I also tried both static and dynamic linking when I wrote the empty
> > main().
>
> I believe the dynamic linking issue was in pre glibc 2.3.4 (atleast on SH3)
> so shouldn't be an issue atm.

and static seems to fail the same way ...

you could try enabling magic sysrq on your system.  otherwise, jtag/kgdb would 
be very useful just to see where the processor is stuck.

> > Busybox as a shell and an /init shell script seems to suffer from the
> > same symptoms.
> >
> > My setup:
> > cpu: SH7751R LE configuration
> > kernel: 2.6.25-rc8
> > gcc: Gentoo 4.1.2 p1.0.2 with glibc 2.7
> >
> > I started to suspect my too-new glibc, so now I'm struggling with
> > crossdev to compile a uclibc
> > toolchain.
>
> I know glibc 2.3.x / 2.4.x / 2.5.x works well, but never tried 2.7. Usually
> though its gcc thats causing the issues. But you should step back and build
> it with older gcc/glibc just to make sure.
>
> For reference I usually use gcc 3.4.5 & glibc 2.3.6 for kernel builds.

glibc-2.7 seems to work fine on my systems ...
-mike

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