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Emulab FAQ: Testbed Operations: Serial console access doesn't work, but SSH does?

Emulab FAQ: Testbed Operations: Serial console access doesn't work, but SSH does?

> When I boot the Linux image, it displays debugging messages but
> stops after the line "freeing unused kernel memory: 148K freed".
> There is no login prompt.  However, I can still SSH into the node from
> boss.

The serial console setup is probably wrong in the Linux image in some way.