Hi,
For a special purpose I needed a initramfs - that didn't work. So I reduced the initramfs setup to the simplest.
Mount the root and switch_root into it. But that didn't work either. I really am stuck here!
If I go with the init-script for the initramfs I posted below the system prints out the
switch_root usage-text from busybox. But the syntax is right, ain't it??
When I use chroot instead of switch_root then it prints the
usage-text of init before the kernel panic.
If I try with "/sbin/init 5" then, after a while the system reports "init: timeout opening/writing control channel /dev/initctl".
In the other cases I get the following error messages before the system hangs:
"Kernel Panic", "Attempted to kill init", "init not tainted"
(With the init script below there is a error saying:"sh: can't access tty; job control turned off". I know why it's there - but don't know if it is connected to this problem.)
This information may be important:
- The machine boots from a usb-harddisk
- /sbin/init on the new root is available
- the system on newroot is sane and runs perfect standalone (without initramfs)
- the system on newroot uses baselayout-2 with openrc
- busybox is built as static binary
- busybox version is v1.15.3
Here is the relevant data:
My uname -a on that machine:
Code:
Linux nibbler 2.6.35-zen2 #13 ZEN Fri Nov 5 21:40:41 CET 2010 i586 Geode(TM) Integrated Processor by AMD PCS AuthenticAMD GNU/Linux
Content of the initramfs:
Code:
-rwxr-xr-x 1 root root 348 Nov 7 11:00 init
bin:
total 1.5M
drwxr-xr-x 2 root root 4.0K Nov 7 10:15 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
-rwxr-xr-x 1 root root 1.5M Nov 6 19:03 busybox
dev:
total 20K
drwxr-xr-x 5 root root 4.0K Nov 7 10:15 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
crw------- 1 root root 5, 1 Nov 7 10:14 console
drw------- 2 root root 4.0K Nov 7 10:15 fb
crw------- 1 root root 1, 1 Nov 7 10:14 mem
drw------- 2 root root 4.0K Nov 7 10:15 misc
crw-rw-rw- 1 root root 1, 3 Nov 7 10:14 null
crw--w---- 1 root root 4, 0 Nov 7 10:14 tty0
crw------- 1 root root 4, 1 Nov 7 10:14 tty1
drw------- 2 root root 4.0K Nov 7 10:15 vc
crw------- 1 root root 1, 5 Nov 7 10:14 zero
etc:
total 8.0K
drwxr-xr-x 2 root root 4.0K Nov 6 12:03 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
lib:
total 8.0K
drwxr-xr-x 2 root root 4.0K Nov 7 10:15 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
mnt:
total 8.0K
drwxr-xr-x 2 root root 4.0K Nov 6 12:03 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
proc:
total 8.0K
drwxr-xr-x 2 root root 4.0K Nov 6 12:03 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
root:
total 12K
drwxr-xr-x 2 root root 4.0K Nov 7 00:28 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
-rw-r--r-- 1 root root 33 Nov 7 00:28 .ash_history
sbin:
total 624K
drwxr-xr-x 2 root root 4.0K Nov 7 10:16 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
lrwxrwxrwx 1 root root 12 Nov 7 00:28 mdev -> /bin/busybox
-rwxr-xr-x 1 root root 607K Nov 6 12:06 mount.aufs
-rwxr-xr-x 1 root root 963 Nov 7 10:16 umount.aufs
sys:
total 8.0K
drwxr-xr-x 2 root root 4.0K Nov 6 12:03 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
usr:
total 16K
drwxr-xr-x 4 root root 4.0K Nov 7 10:12 .
drwxr-xr-x 12 root root 4.0K Nov 7 11:21 ..
drwxr-xr-x 2 root root 4.0K Nov 6 18:43 lib
drwxr-xr-x 2 root root 4.0K Nov 7 10:12 share
This is one of the more sane versions of the init:
Code:
#!/bin/busybox ash
# -*- mode: sh -*-
export CONSOLE="/dev/tty1"
mkdir /mnt/ro
mount -t proc none /proc
mount -t sysfs none /sys
sleep 15
mdev -s
echo mdev > /proc/sys/kernel/hotplug
mount -o ro /dev/sda2 /mnt/ro
echo > /proc/sys/kernel/hotplug
umount /proc
umount /sys
exec switch_root /mnt/ro /sbin/init
# or chroot /mnt/ro /sbin/init
This command is used for creating the archive:
Code:
find . -print0 | cpio --null -ov --format=newc | gzip -9 > /boot/initramfs.cpio.gz
This is the grub.conf:
Code:
# GRUB CONFIG
default 1
timeout 3
# The normal boot - rootdelay is important!
title Gentoo Linux 2.6.35-zen
root (hd0,1)
kernel /boot/bzImage-2.6.35-zen root=/dev/sda2 rootdelay=20
# The initramfs config
# Here I tried also without rootdelay and with ichkpt=6 - no difference
title Aufs Gentoo Linux 2.6.35-zen
root (hd0,1)
kernel /boot/bzImage-2.6.35-zen root=/dev/sda2 rootdelay=20
initrd /boot/initramfs.cpio.gz
Here is the kernel config:
http://pastebin.com/Y0Fz48J7
Any help is highly appreciated!
