Honeycomb LX2 kernel config/boot params for console output?

I installed Gentoo on my LX2 and get as far as loading the kernel, but then I lose console output. I tried using the same boot parameters as SolidRun’s Ubuntu image, no dice. Thinking it’s probably a kernel config change that needs to happen. Does anyone know which flags need to be set for the LX2 to produce console output?