Ok, found the issue: a kernel will only boot in Lucid if devtmpfs is
compiled in. Just setting the following in my .config results in a
successful boot:

CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y

Just to repeat: this is a change that occurred late in the lucid
development cycle; before then, devtmpfs was not necessary.

I don't know if making devtmpfs mandatory was a deliberate move or just
accidental, so I'll leave it up to someone else to decide whether to
close this as INVALID or not. Personally, I've got no objection to
enabling devtmpfs so I'm happy now.

-- 
cannot boot custom kernel with no initrd
https://bugs.launchpad.net/bugs/575666
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