[gentoo-embedded] dynamic linked init and initrd

[Natanael Copa]

I'm working on a cdrom where an uclibc system is running from RAM.

The idea is to build runtime modules that is pulled during boot, just 
like leaf (I'm actually porting a bering based cd)

I have some problem with the init program when it is dynamically linked.

The init program is supposed to be a shell script that only start a 
busybox shell. Thats a start. But no matter what I do, busybox won't 
start my script and I think it is because busybox is dynamically linked. 
I want it to be so.

My kernel parameter is

init=/linuxrc

where linuxrc is a shell script:
#!/bin/busybox sh

/bin/busybox sh


Just for testing I wrote a hello world program and used it as init. 
(init=/hello)

When this is linked statically, this is what I get:

Hello world!
Kernel panic: Attempted to kill init!

The hello world is executed and "init" exits. Fine. Everything works.

But when I link my hello program dynamically, linux says:

Kernel panic: No init found. Try passing init= option to kernel.

Those are the files that are on my initrd image:
bin/busybox
bin/sh
lib/libm.so.0
lib/libcrypt.so.0
lib/libc.so.0
lib/ld-uClibc.so.0
hello
dev/console
sbin/ldconfig

When I run ldd on /sbin/init on the ucgentoo build box it says that init 
also is dynamically linked:
ucgentoo:/usr/src/bsn2 # ldd /sbin/init
        libc.so.0 => /lib/libc.so.0 (0x40007000)
        ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x40000000)

So it *is* possible to have a dynamically linked init program. But I am 
missing something.
If anywone could give me hint, links about init/dynamic linking whatever 
that could push me forward, I would be very thankful.

Thanks!


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