Hi, I bought a adafruit gps module http://www.adafruit.com/products/746 and a raspberry pi. Now cross compiling a kernel with pps support is too much of a hassle (for me). So I wrote a small program which, from userspace, listens on a selectable GPIO pin and then feeds the timestamp via shared memory to NTP. Works not very bad: 10us jitter at most. I thought maybe some of you might be interested. The (open source, of course) program can be retrieved from: http://vanheusden.com/time/rpi_gpio_ntp/
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