ok, let's see if gps hw works at all: please do echo 1 > /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/neo1973-pm-gps.0/pwron cat /dev/ttySAC1 i think if the hw is ok, some readable lines beginning with G and a lot of commata should appear and after a while between the commata long numbers.