NFS root on BeagleBone Black

[Oleksandr Tymoshenko]

On 2013-07-07, at 10:06 PM, Douglas Beattie <beattidp at ieee.org> wrote:

> Working with the BeagleBone Black, I'm hoping to achieve boot to NFS root.
> Thinking I'm fairly far along, I'm stuck with an 'error 19' at the final steps of
> booting the kernel. Here's a little background -- any hints would be appreciated.
> 
> On FreeBSD 9.1, I have a TFTP server, plus an NFS export on the same folder;
> here are a few snippets from the console, which confirm this.
> 
> [bsd03: /root/oss/crochet-freebsd]# tail -n2 /etc/inetd.conf 
> tftp    dgram   udp     wait    root    /usr/libexec/tftpd      tftpd -l -s /opt/tftpboot
> tftp    dgram   udp6    wait    root    /usr/libexec/tftpd      tftpd -l -s /opt/tftpboot
> [bsd03: /root/oss/crochet-freebsd]# cat /etc/exports
> /opt/tftpboot -maproot=0 -alldirs -network 192.168.0.0 -mask 255.255.255.0
> [bsd03: /root/oss/crochet-freebsd]# showmount -e
> Exports list on localhost:
> /opt/tftpboot                      192.168.0.0 
> 
> I have built (using the excellent crochet facility) and can boot FreeBSD from
> the microSD card, and I have verified that I can NFS mount the exported folder.
> 
> Then, I created a custom kernel configuration, BEAGLEBONENFSROOT, with
> just a couple changes, as follows:
> 
> options         NFS_ROOT                #NFS usable as /, requires NFSCL
> options         ROOTDEVNAME=\"nfs:192.168.0.198:/opt/tftpboot/beaglebone\"
> 
> And, then I built the kernel from the command line, with DESTDIR into my target
> folder for NFS root, doing all the make targets in turn; buildworld, buildkernel,
> installkernel, installworld, distrib-dirs, distribution ...

I'm not 100% sure but it might be NFS version mismatch. AFAIR we have
now both NFSv3 and NFSv4 in kernel. NFSv3 prefix is oldnfs, NFSv4 prefix is nfs
(or is it newnfs too?). NFSv3 is enabled by NFSCLIENT. Make sure you server NFS
and client NFS versions are synced.