The string "sOutW" is defined in the rocketport driver, and it outputs a debug message formatted that way.
It is possible you have debugging turned on for that driver - and it has to be turned on during the compile for that driver (otherwise the message is conditioned out). The other odd thing is that the source code has a newline showing to end the message. so I'm not sure why the dmesg output would have lost that.
Is it possible this is an old kernel? (the source I see looks like it is for a linux 2.6 version. back in 2003).
forgot the reference: http://lxr.free-electrons.com/source...int.h?v=2.6.26