[recent macs] I'd do a vanilla amd64 build and try that. I have the impression it works. Long ago (4.0?), there was a multi-arch image that had about 8 architectures (something like i386, amd64, sparc, sparc64, macppc, alpha, ?), and something in the boot process found the right bootloader and kernel for each one. It is surely easier to have two separate cds. I wouldn't try to run i386 userland with an amd64 kernel even though it might work; it seems like asking for trouble.
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