The "clocksource tsc unstable" message has nothing to do with b43, b43legacy, or any other wireless driver. It comes from your CPU. Many, if not all, AMD 64-bit processors will show this message. Mine does, but it does not affect any operations. Linux uses other clocks that are stable, and is just informing you of the situation. Please IGNORE this message.
The "clocksource tsc unstable" message has nothing to do with b43, b43legacy, or any other wireless driver. It comes from your CPU. Many, if not all, AMD 64-bit processors will show this message. Mine does, but it does not affect any operations. Linux uses other clocks that are stable, and is just informing you of the situation. Please IGNORE this message.