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Problems with NFS server


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= ip=

At boot I get the following messages:
eth0: using half-duplex 10Base-T (RJ-45)
IP-Config: Guessing netmask
IP-Config: Complete:
      device=eth0, addr=, mask=, gw=,
     host=, domain=, nis-domain=(none),
     bootserver=, rootserver=, rootpath=
Looking up port of RPC 100003/2 on
Looking up port of RPC 100005/1 on
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
15:01:58: mountd: PID 4064: NFS mount request completed (/usr/src/buildroot-20060308/build_arm/root, from

I am exporting a directory with correct permissions, my /etc/exports contains:

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

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


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