Making a Smart Watch

[Nicholas Leippe]

try: http://www.linuxfordevices.com/c/a/News/CSR-SiRFatlasV/
or peruse linuxfordevices.com and maybe find something else that may
suit your needs

Not exactly what you need:
http://www.lantronix.com/device-networking/embedded-device-servers/xport-ar.html
but they may have something else that is close, or be willing to make
it--they clearly have expertise in *tiny* systems