So I used Windows machine briefly... and now it should be possible to upgrade firmware over-the-air. That's good, because that should be doable from Control Center... and that runs from Linux.
But I'm now hitting other problem: where to get gcc-msp430 that works under Linux? I got one from TinyOS project, but that will not work with CPU in Chronos. I tried one from tevp.net, but that depends on binutils-msp430... Ideas?