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Fast Data MMU miss usually means that your boot disk either doesn't have an OS on it, or the boot block wasn't put on it. You might be booting from the wrong slice, or are using an image from a different architecture (like sun4v). The E10K is sun4u. You need to install the SUNWXCALL cluster to get all the E10K support.
If a board won't power on, that could be because of a fault in the board, or possibly a server configuration error. The error messages from POST should tell you. You can find the POST logs in the proper SSP domain directory to check.
You can certainly run with one board, if you create the domain with just the one board. It better be the one with the I/O card to the boot drive, though!