time-sync is a utility to sync the time with any Rockbox target that runs the software USB stack. It was originally take from libgpod and stripped of unnecessary code. http://gtkpod.git.sourceforge.net/git/gitweb.cgi?p=gtkpod/libgpod To compile and install, just run: make make install Example run: mcuelenaere@wim2160:~/rockbox/utils/time-sync$ sudo time-sync /dev/sdb1 Data Payload: 07 da 00 14 04 0c 30 2b 00 00 00 00 Write buffer cmd: 3b 01 00 0c 00 00 00 00 0c 00 Time was synced! Example udev rule (for Onda VX747): # automatically adjust my Rockboxed DAP RTC ACTION=="add", ATTRS{idVendor}=="07c4", ATTRS{idProduct}=="a4a5", KERNEL=="sd?", NAME="%k", RUN+="/usr/local/bin/time-sync /dev/%k"