Content-class: urn:content-classes:message
Subject: Problems with NFS server
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Date: Thu, 15 Jun 2006 15:36:15 +0200
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From: "Nicolas Boudin" <N DOT Boudin AT neopost DOT com>
To: <cygwin AT cygwin DOT com>
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Hello,

I am trying to export via NFS a cygwin directory as a root filesystem for an embedded Linux system (I hope it can work..), but I get problems. I installed the NFS services properly on Windows XP (nfsd, portmap, mountd). As indicated in the install script, they are running as an user that I created, member of the Administrators group. The Linux system can use an NFS root filesystem from a Linux PC without any problem, so my configuration should be OK. I use the NFS cygwin package version 2.3-4.

My kernel command line is:
console=ttyCL1 root=/dev/nfs nfsroot=172.16.20.245:/usr/src/buildroot-20060308/build_arm/root ip=172.16.7.65

At boot I get the following messages:
(...)
eth0: using half-duplex 10Base-T (RJ-45)
IP-Config: Guessing netmask 255.255.0.0
IP-Config: Complete:
      device=eth0, addr=172.16.7.65, mask=255.255.0.0, gw=255.255.255.255,
     host=172.16.7.65, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=172.16.20.245, rootpath=
Looking up port of RPC 100003/2 on 172.16.20.245
Looking up port of RPC 100005/1 on 172.16.20.245
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

It waits for about 3 seconds after the "Looking up..." lines and then it gives this error.

All I get in my logs on my server are these messages:
15:01:54: mountd: PID 4064: NFS mount request received (/usr/src/buildroot-20060308/build_arm/root, from 172.16.7.65).
15:01:58: mountd: PID 4064: NFS mount request completed (/usr/src/buildroot-20060308/build_arm/root, from 172.16.7.65).

I am exporting a directory with correct permissions, my /etc/exports contains:
/usr/src/buildroot-20060308/build_arm/root	172.16.7.65(rw,no_root_squash)

What is strange is that I don't get any error from nfsd.

If you have any idea... Thanks in advance for any help.

Nicolas

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