CONFIG_ROOT_NFS missing on 2.6.11-gentoo-r8

[Mrs Kensington]

I'm trying to create a network booting system and following the tutorial on the gentoo wiki.

For it to work correctly I have to have "Root file system on NFS" compiled into my kernel which is CONFIG_ROOT_NFS.

However this isn't in the options in menuconfig i just get the following in File System -> Network File System...

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<*> NFS file system support
[*]   Provide NFSv3 client support
[ ]   Provide NFSv4 client support (EXPERIMENTAL)
[ ]   Allow direct I/O on NFS files (EXPERIMENTAL)
<M> NFS server support
[*]   Provide NFSv3 server support
[ ]     Provide NFSv4 server support (EXPERIMENTAL)
[*]   Provide NFS server over TCP support
< > Secure RPC: Kerberos V mechanism (EXPERIMENTAL)
< > Secure RPC: SPKM3 mechanism (EXPERIMENTAL)
<M> SMB file system support (to mount Windows shares etc.)
[*]   Use a default NLS (cp437) Default Remote NLS Option
< > CIFS support (advanced network filesystem for Samba, Window and other CIFS compliant servers)
< > NCP file system support (to mount NetWare volumes)
< > Coda file system support (advanced network fs)
< > Andrew File System support (AFS) (Experimental)

if i search the .config file for CONFIG_ROOT_NFS it isn't in there...

I thought maybe it was now implied by one of the other options but when I boot I get...

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VFS: Cannot open root device "nfs" or unknown-block(0,255)
Please append a correct "root=" boot option
Kernel panic- not syncing: VFS: Unable to mount root fs on unknown-block(0,255)

my grub line says....

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kernel /test/boot/kernel-2.6.11-gentoo-r8 ip=dhcp root=/dev/nfs nfsroot=10.0.0.1:/diskless/test

Does anyone have any ideas?

Thanks in advance

[Mrs Kensington]

ok I've managed to get it to work...

thanks to MajikC in the following thread...

http://forums.gentoo.org/viewtopic-t-240592.html

basically I had to enable the following in my kernel... i think the latter items appeared after enabling the first...

Device Drivers --> Networking support ---> Networking options ---> IP: kernel level autoconfiguration
Device Drivers --> Networking support ---> Networking options ---> IP: DHCP Support
File Systems ---> Network File Systems ---> Root file system on NFS

Just posting this in case anyone has the same problem...

off to enjoy diskless goodness now!

[MajikC]

Very happy to be of any assistance, I am a bit late posting, but very happy to of helped.