mount rootfs over NFS problem

mount rootfs over NFS problem

[kerstin jonsson]

Hi,

I have a powerpc based platform and would like to have access to all the 
latest
RapiodIO patches included in the mm-tree, but I fail to mount my rootfs 
over nfs using the latest mm-kernel.

I can see that the code handling nfs mount in the mm-tree differs 
significantly from the  code in the kernel I used earlier (where nfs 
mount of rootfs works for me - linux-2.6 currently 2.6.36-rc8).

I'm using the same default_config options as input to the mm-build as I 
do for 2.6.36-rc8 and the same kernel cmdline options, the console log 
from the boot show no significant deviation from the two kernels, not 
until I reach the point init init/main.c:kernel_init() where 
/dev/console is supposed to be opened. If it is helpfull in any way, the 
nfs mount attempt fails at:

line 2131 of fs/namespace.c:do_mount()

I guess that there is something that I need to do different to make this 
happen in the mm-tree - possibly something my platform init code should 
have prepared or some extra kernel config option(s) that  is/are needed 
when building the mm kernel.

Please advice!
Kerstin

Kernel command line: root=/dev/nfs rw nfsroot=192.168.0.201:/srv/nfs 
ip=192.168.0.142:192.168.0.201:192.168.0.1:255.255.255.0:unknown:eth0:off console=ttyS0,115200 
riohdid=0 nfsrootdebug

console printout from mm-kernel:
...
IP-Config: Complete:
      device=eth0, addr=192.168.0.142, mask=255.255.255.0, gw=192.168.0.1,
      host=unknown, domain=, nis-domain=(none),
      bootserver=192.168.0.201, rootserver=192.168.0.201, rootpath=
Warning: unable to open an initial console.
Root-NFS: nfsroot=/srv/nfs
VFS: Unable to mount root fs via NFS, trying floppy.
...

console printout from 2.6.36-rc8:

...
IP-Config: Complete:
      device=eth0, addr=192.168.0.142, mask=255.255.255.0, gw=192.168.0.1,
      host=unknown, domain=, nis-domain=(none),
      bootserver=192.168.0.201, rootserver=192.168.0.201, rootpath=
Root-NFS: Mounting /srv/nfs on server 192.168.0.201 as root
Root-NFS:     rsize = 4096, wsize = 4096, timeo = 0, retrans = 0
Root-NFS:     acreg (min,max) = (3,60), acdir (min,max) = (30,60)
Root-NFS:     nfsd port = -1, mountd port = 0, flags = 00000200
Looking up port of RPC 100003/2 on 192.168.0.201
PHY: mdio@fa724520:09 - Link is Up - 100/Full
Root-NFS: Portmapper on server returned 2049 as nfsd port
Looking up port of RPC 100005/1 on 192.168.0.201
Root-NFS: mountd port is 34144
VFS: Mounted root (nfs filesystem) on device 0:12.
...

Re: mount rootfs over NFS problem

[kerstin jonsson]

As it turned out the PPC32 build was broken - due to changes in the
initramfs size calculation - I ended up with a __initramfs_size of zero, 
after
which not much worked.
Sorry for cluttering the list with misleading information, however, no 
one seem
to have taken any notice so I guess - no harm done.
Patch to follow...

Rgds,
Kerstin

On 10/20/2010 05:03 PM, kerstin jonsson wrote:
> Hi,
>
> I have a powerpc based platform and would like to have access to all the
> latest
> RapiodIO patches included in the mm-tree, but I fail to mount my rootfs
> over nfs using the latest mm-kernel.
>
> I can see that the code handling nfs mount in the mm-tree differs
> significantly from the  code in the kernel I used earlier (where nfs
> mount of rootfs works for me - linux-2.6 currently 2.6.36-rc8).
>
> I'm using the same default_config options as input to the mm-build as I
> do for 2.6.36-rc8 and the same kernel cmdline options, the console log
> from the boot show no significant deviation from the two kernels, not
> until I reach the point init init/main.c:kernel_init() where
> /dev/console is supposed to be opened. If it is helpfull in any way, the
> nfs mount attempt fails at:
>
> line 2131 of fs/namespace.c:do_mount()
>
> I guess that there is something that I need to do different to make this
> happen in the mm-tree - possibly something my platform init code should
> have prepared or some extra kernel config option(s) that  is/are needed
> when building the mm kernel.
>
> Please advice!
> Kerstin
>
> Kernel command line: root=/dev/nfs rw nfsroot=192.168.0.201:/srv/nfs
> ip=192.168.0.142:192.168.0.201:192.168.0.1:255.255.255.0:unknown:eth0:off console=ttyS0,115200
> riohdid=0 nfsrootdebug
>
> console printout from mm-kernel:
> ...
> IP-Config: Complete:
>        device=eth0, addr=192.168.0.142, mask=255.255.255.0, gw=192.168.0.1,
>        host=unknown, domain=, nis-domain=(none),
>        bootserver=192.168.0.201, rootserver=192.168.0.201, rootpath=
> Warning: unable to open an initial console.
> Root-NFS: nfsroot=/srv/nfs
> VFS: Unable to mount root fs via NFS, trying floppy.
> ...
>
> console printout from 2.6.36-rc8:
>
> ...
> IP-Config: Complete:
>        device=eth0, addr=192.168.0.142, mask=255.255.255.0, gw=192.168.0.1,
>        host=unknown, domain=, nis-domain=(none),
>        bootserver=192.168.0.201, rootserver=192.168.0.201, rootpath=
> Root-NFS: Mounting /srv/nfs on server 192.168.0.201 as root
> Root-NFS:     rsize = 4096, wsize = 4096, timeo = 0, retrans = 0
> Root-NFS:     acreg (min,max) = (3,60), acdir (min,max) = (30,60)
> Root-NFS:     nfsd port = -1, mountd port = 0, flags = 00000200
> Looking up port of RPC 100003/2 on 192.168.0.201
> PHY: mdio@fa724520:09 - Link is Up - 100/Full
> Root-NFS: Portmapper on server returned 2049 as nfsd port
> Looking up port of RPC 100005/1 on 192.168.0.201
> Root-NFS: mountd port is 34144
> VFS: Mounted root (nfs filesystem) on device 0:12.
> ...
>
>
>
>
>
> --
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