Barebox Linux NFS-Root

Forum: Linux
Dirk 
I try to run Linux with nfs-root from barebox, but the kernel cannot mount
root-filesystem. I've added parts of my "/env/config" and some messages
from booting, which I regarded as being important for my problem.

Does anybody has a hint for me? Did I forget anything in my config?

Kind Regards

Dirk

/env/config:
..
eth0.ipaddr=192.168.10.200
eth0.serverip=192.168.10.150
eth0.netmask=255.255.255.0
eth0.gateway=192.168.10.254
..
kernel_loc=tftp
rootfs_loc=net
rootfs_type=jffs2
rootfsimage=rootfs.${rootfs_type}
..
_______________________________

Boot-Output:
..
Starting kernel ...

commandline: console=ttySAC0,115200 mini2440=0tbi
ip=192.168.10.200::192.168.10.254:255.255.255.0::: root=/dev/nfs
nfsroot=192.168.10.150:/srv/nfsroot,v3,tcp noinitrd
mtdparts=nand:256k(bareb)
arch_number: 1999
Uncompressing Linux... done, booting the kernel.
..
..
dm9000 dm9000: eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
IP-Config: Complete:
     device=eth0, addr=192.168.10.200, mask=255.255.255.0,
gw=192.168.10.254,
     host=192.168.10.200, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=192.168.10.150, rootpath=
VFS: Mounted root (nfs filesystem) on device 0:15.
devtmpfs: error mounting -2
Freeing init memory: 148K
Kernel panic - not syncing: No init found.  Try passing init= option to
kernel. See Linux Documentation/init.txt for guidance.
[<c00326d4>] (unwind_backtrace+0x0/0xf4) from [<c0350fa0>]
(panic+0x4c/0x1ac)
[<c0350fa0>] (panic+0x4c/0x1ac) from [<c002d5b0>] (init_post+0xc4/0x140)
[<c002d5b0>] (init_post+0xc4/0x140) from [<c0008430>]
(kernel_init+0xe4/0x120)
[<c0008430>] (kernel_init+0xe4/0x120) from [<c002e878>]
(kernel_thread_exit+0x0/0x8)

davef 
Have you tried to mount a "default" rootfs via NAND.  Are you using the
Pengutronix BSP?  Which version of Barebox?

Dirk 
It's barebox 2011.07, Kernel 3.0, busybox 1.18.5.

I found out, that root seemed to be mounted.
When I deactivated devtmpfs in Kernel-Config,
I get another message. (No Init found).
(On /sbin/init is a link to busybox.)


IP-Config: Complete:
     device=eth0, addr=192.168.10.200, mask=255.255.255.0,
gw=192.168.10.254,
     host=192.168.10.200, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=192.168.10.150, rootpath=
VFS: Mounted root (nfs filesystem) on device 0:14.
Freeing init memory: 148K
Kernel panic - not syncing: No init found.  Try passing init= option to
kernel. See Linux Documentation/init.txt for guidance.
[<c00326d4>] (unwind_backtrace+0x0/0xf4) from [<c0350b14>]
(panic+0x4c/0x1ac)
[<c0350b14>] (panic+0x4c/0x1ac) from [<c002d5b0>] (init_post+0xc4/0x140)
[<c002d5b0>] (init_post+0xc4/0x140) from [<c00083f0>]
(kernel_init+0xe4/0x120)
[<c00083f0>] (kernel_init+0xe4/0x120) from [<c002e878>]
(kernel_thread_exit+0x0/0x8)

davef 
Dirk,

You seem to be at the "bleeding edge"!  I am still working with Barebox
2011.05 and 2.6.39.3.

Good luck,
Dave

Dirk 
I used buildroot (latest from git)
"make mini2440_defconfig"
Added Barebox and Kernel3.0 :-)

Is it possible, that there is something wrong with my busybox-binary?


Kind Regards
Dirk

davef 
That looks suspect, but it has been over a year since I struggled with
cross-compiling Busybox myself.

It is suppose to use a default init file, if don't provide one.

Dave.

dirk 
I had a look at LXR.
I found out (main.c from line 677)
Kernel tries several defaults, before it panics.
I'm sure to have "/sbin/init" in my rootfs.
Is there a possibility to debug loading my init?

Kind Regards

Dirk


if (execute_command) {
     run_init_process(execute_command);
     printk(KERN_WARNING "Failed to execute %s.  Attempting "
     "defaults...\n", execute_command);
}
run_init_process("/sbin/init");
run_init_process("/etc/init");
run_init_process("/bin/init");
run_init_process("/bin/sh");


panic("No init found.  Try passing init= option to kernel. "
      "See Linux Documentation/init.txt for guidance.");

Juergen Beisert 
> devtmpfs: error mounting -2

Does your "/srv/nfsroot" contains a dev/ directory?

dirk 
Do you mean, that I need a whole filesystem in /srv/nfsroot ?

I just put the rootfs.jffs2 file there.
the rootfs.jffs2 contains a "/dev"-directory.

dirk 
Ok, 
I've unpacked my rootfs to /srv/nfsroot.
Finished.



Thanks a lot.


Kind Regards

Dirk

Juergen Beisert 
Dirk,

you always need the whole root filesystem at the location where you
instruct your kernel to NFS-mount. That is how "NFS root filesystem" is
working.
The rootfs.jffs2 is intended for the NAND flash.

dirk 
Yes,
I understood after your last answer.

Thanks for your help. 




Kind regards

Dirk