Comment 35 for bug 537133

That's a bit odd. I would expect if you had rw in your kernel options, and ro in your fstab, that it would do the remount. But in any case I think the kernel should mount the nfsroot rw unless you give ro in the kernel options.

I'm going to bring this up on the nfs mailing list (I'm an nfs developer, but have nothing to do with nfsroot).