Template:FAQ/Questions/robostix board works when

==The robostix board works when a solo board because the sample program that lights LEDs operates properly. When connected to the gumstix Linux board, neither board works: the Linux board does not boot, the gumstix LED program does not run, and the atmega ISP will not connect to the robostix.== The way things power up when the robostix/gumstix are connected together, the robostix is held in reset (so nothing on the robostix runs). See the Robostix uboot page for a way that the robostix can be made to start running as soon as the gumstix is powered on.

The ISP connector will only work when the robostix is NOT plugged into a gumstix. This is because the gumstix is trying to drive the same signals that the ISP programmer is.

The console port should work fine, but it's a TTL level console port and not an RS-232 level port, so you need some type of external voltage conversion device (like the one from Acroname or HVWTech). An unmodified tweener board will not work with the robostix/gumstix either.

Some customers see the red LED flash very briefly when they power things up (this is the program on the AVR trying to run, but then whatever u-boot does to the GPIO lines causes the robostix to go into reset, at which point the Red LED goes out.