Re: nfs root filesystem

Keep in mind you need to enable the other options in the kernel config
specifically for root over nfs.

Craig Casey


On 7/12/05, Craig Hughes <craig@xxxxxxxxxxx> wrote:
> On Jul 11, 2005, at 9:09 PM, John D. Blair wrote:
> 
> > Yeah, I already rebuilt my kernel so nfs is not a module.  I've
> > confirmed that I've built it correctly, too... when I boot off the
> > kernel using flash and mount an nfs drive, it doesn't show the nfs
> > driver loaded.  This is correct since its not compiled as a module.
> 
> not just NFS though -- also need to build-in smc91x and all the TCP/
> IP stuff NFS needs.
> 
> C
> 
> 
> > On Mon, 2005-07-11 at 22:44 -0400, albertd wrote:
> >
> >> John:
> >>
> >> As far as I remember, current buildroots have all the networking
> >> drivers
> >> built as modules, and those modules are needed for nfs rooting.
> >>
> >> The modularization is needed to support the varieties of gumstix out
> >> there (possibilities are no bt, no usb, no wifi), so you will have to
> >> build your favorites into your kernel and make sure that the
> >> equivalent
> >> of a MAC is known at boot time.
> >>
> >> Make sure you track your linux 2.6.x .config file outside the
> >> buildroot
> >> so Craig's good work will not undo yours. :)
> >>
> >>     Albert.
> >>
> >> John D. Blair wrote:
> >>
> >>
> >>> I'm trying to boot my gumstix with a nfs root filesystem.  Has
> >>> anybody
> >>> tried to do this?  I can't get it working.
> >>>
> >>> Here's what I'm trying:
> >>>
> >>> First, I rebuilt my kernel so nfs was not a module anymore and
> >>> installed
> >>> this on the flash on my gumstix.
> >>>
> >>> Next, I try booting with the bootargs u-boot variable set to this:
> >>>
> >>> console=ttyS0,115200n8 root=/dev/nfs ip=192.168.101.106  \
> >>>   nfsroot=192.168.101.16:/home/gumstixroot reboot=cold,hard
> >>>
> >>> I also set the serverip and ipaddr variables to the correct values.
> >>>
> >>> I know the nfs server works, since I can mount it on the gumstix in
> >>> someplace other than root if I boot the gumstix from flash.  I
> >>> can even
> >>> use pivot_root to make the nfs filesystem into the root filesystem.
> >>>
> >>> Here's the last few lines of the console:
> >>>
> >>> IP: routing cache hash table of 512 buckets, 4Kbytes
> >>> TCP established hash table entries: 4096 (order: 3, 32768 bytes)
> >>> TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
> >>> TCP: Hash tables configured (established 4096 bind 4096)
> >>> Kernel panic - not syncing: VFS: Unable to mount root fs on
> >>> unknown-block(0,255)
> >>>
> >>> Does anybody have any suggestions?
> >>>
> >>> -john.
> >>>
> >>>
> >>>
> >>>
> >>>
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> 
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