Considering the case in which the name resolution by NIS is carried out, ypbind should rise ahead of nfs.
I don't think it is a PPC specific bug... The point is we don't know how a host resolves DNS. If the host chooses to look up domain name by NIS and we have hostname based NFS imports like somehosts:/export/home /home nfs defaults 0 0 it will fail to mount somehosts:/export/home since rcscripts are run by alphabeticalorder when no depend() defined and /etc/init.d/netmount is invoked after /etc/init.d/ypbind. It seems rather like configuration issue but we'd better have "use ypbind" in depend() section of netmount.
this would need to be modified in the netmount rc-script... this seems like an issue for baselayout.
nfs-util's nfsmount init script has been fixed to include a 'use ypbind' in the depend(). Please reemerge nfs-utils or simply copy the file from /usr/portage/net-fs/nfs-utils/files/nfsmount to /etc/init.d