Hello Black,
See steps below, and try:
(1) Compliling android source code
(2) Copy init.gprs-pppd to /out/target/..../system/etc (编译输出路径中,输出system.img的地方)
(3)Copy 3gdata_call.conf to /out/target/..../system/etc
(4)Copy rild to /out/target/..../system/bin
(5)Copy libreference-ril.so /out/target/.... /system/lib/
(6)Copy libril.so /out/target/.... /system/lib/
/* the following to lines should added to /out/target/...../init.rc or init.freescale.rc */
(7) chmod 777 /etc/init.gprs-pppd
(8)chmod 777 /system/bin/rild
Then run "make" command, new sysmtem.img will be created.
Have a nice day!
BR,
Weidong