How do I disable ethernet auto-negotiation on the ConnectCore 9U?

At the U-Boot prompt enter:

setenv link 10:full
saveenv

Power cycle to make the new settings take effect.

Other possible settings:
setenv link 10:half;saveenv
setenv link 100:full;saveenv
setenv link 100:half;saveenv

To switch back to autonegotiation, remove the link variable:

setenv link; saveenv
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