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I'd check which version of NFS you're using to export your NFS share from the Solaris 10 box - it may be that it's not available on Sol 9 box?
NFSv4 isn't available on Solaris 9, but I would expect it to step down if that were the problem. To test this, first I edited /etc/default/nfs to force the maximum protocol to 3, restarted nfsd with svcadm and confirmed with rpcinfo that only 2 and 3 were advertised. The boot hung in the same place. Then I forced v2 over UDP only and tried again. It hung again in the same place.
Solaris 10 boots successfully with the boot server forced to v2 over UDP and left at defaults.
I've seen this with Solaris 9 as the boot server for a Solaris 8 machine. Didn't work. If I wanted to boot Solaris 8 machine, I had to use Solaris 8 boot server. Same for Solaris 9 - Solaris 9 boot server to boot solaris 9 machine. I suspect Solaris 10 is the same way - Solaris 10 boot server for Solaris 10 machine.