1 概述
平台：freescale i.MX 6Quad 4核开发板Sabrelite
操作系统：Android 4.0.4
内核：3.0.15
3G模块：中兴MG3732和UbloxLISA-U130
2 中兴MG3732模块移植
2.1 准备
准备一张可用的联通3G卡，放入SIM卡卡槽，接着把中兴MG3732开发板通过usb连接到主板上。
2.2 移植步骤
1） 拷贝libztewcdma-ril.so文件到 /system/lib目录下
2） 在/driver/usb/serial/option.c中添加pid,vid如下：
{USB_DEVICE(0x19d2, 0xffff) },
{USB_DEVICE(0x19d2, 0xfffe) },
{USB_DEVICE(0x19d2, 0xfffd) },
{USB_DEVICE(0x19d2, 0xfffc) },
{USB_DEVICE(0x19d2, 0xfffb) },
{USB_DEVICE(0x19d2, 0xfff1) },
{USB_DEVICE(0x19d2, 0xfff6) },
{USB_DEVICE(0x19d2, 0xfff7) },
{USB_DEVICE(0x19d2, 0xfff8) },
{USB_DEVICE(0x19d2, 0xfff9) },
{USB_DEVICE(0x19d2, 0xffee) },
{USB_DEVICE(0x19d2, 0xffed) },
{USB_DEVICE(0x19d2, 0xffeb) },
{USB_DEVICE(0x19d2, 0xffec) },
3） 拷贝chat, pppd到/system/bin目录下，确保/system/bin 目前下有pppd 和chat 两个程序，且可以运行
4） 添加ip-up到/system/etc/ppp/目录下
5） 在init.rc文件中添加
chmod 0755 /system/lib/libztewcdma-ril.so
chown root /system/bin/pppd
chmod 4755 /system/bin/pppd
service ril-daemon /system/bin/rild -l/system/lib/libztewcdma-ril.so -- -d /dev/ttyUSB0
socket rild stream 660 root radio
socket rild-debug stream 660 radio system
user root group radio cache inet misc
6） 配置menuconfig如下：
[*] Network device support --->
<*> PPP (point-to-point protocol) support
[*] PPP multilink support (EXPERIMENTAL)
[*] PPP filtering
<*> PPP support for async serial ports
<*> PPP support for sync tty ports
<*> PPP Deflate compression
<*> PPP BSD-Compress compression
<*> PPP MPPE compression (encryption)(EXPERIMENTAL)
<*> PPP over Ethernet (EXPERIMENTAL)
<*> PPP over L2TP (EXPERIMENTAL)
2.3 调试过程
1、 进入android系统后，首先查看模块的端口是否识别，如果能正确识别的话，可以看到以下4个端口：
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB2
/dev/ttyUSB3
2、 注意设置ril-daemon的端口为/dev/ttyUSB0，否则rild进程无法启动，在
logcat –b radio中会显示以下错误：
I/RILJ ( 2392): Couldn't find 'rild' socket; retrying after timeout
I/RILJ ( 2392): Couldn't find'rild' socket; retrying after timeout
I/RILJ ( 2392): Couldn't find'rild' socket; retrying after timeout
I/RILJ ( 2392): Couldn't find'rild' socket; retrying after timeout
I/RILJ ( 2392): Couldn't find'rild' socket; retrying after timeout
3、 在调试过程中，模块可以拨打电话，但无法上网，用ps命令未发现pppd进程，log如下：
D/RILJ ( 2369): 0: [77] SETUP_DATA_CALL
E/RILD ( 2135): get exit sig 17
E/RILD ( 2135): checkPPPConnection: pid_exit == 1
E/RILD ( 2135): checkPPPConnection: interface[ppp0]information is not found
E/RILD ( 2135): start_pppd: failed to check PPP interfaceUP
E/RILD ( 2135): EVENT_PPPD_MANAGER_PPPD_EXIT
E/RILD ( 2135): pppd exit. status = 1024
E/RILD ( 2135): pppd exit . no restart pppd .
E/RILD ( 2135): SetupDefaultPDP failed.
说明pppd进程启动失败。
后发现是pppd权限问题导致，解决方法如下：
启动系统后，在adb中执行以下命令修改pppd权限：
chown root /system/bin/pppd
chmod 4755 /system/bin/pppd
若系统是只读属性，需用remount命令重新挂载文件系统：
mount –o remount,rw/dev/block/mmcblk0p5 /system/
3 ublox LISA-U130模块移植
3.1 准备
准备一张可用的联通3G卡，放入SIM卡卡槽，接着把ublox u130开发板通过usb连接到主板上。
3.2 移植步骤
1） 解压ublox提供的压缩文件如下：
RIL_sc_<version>.zip
ril_sc_<version> Source overlay for Android Platform
build/target/product Device configuration folder files
external/ppp/ Data connection files
hardware/gsm0710muxd Channelmultiplexer
hardware/ril/ublox_ril/ RIL core directory
system/core/rootdir/Android.mk Compilation script
system/core/init/property_service.c Set RIL services property
system/core/liblog/logd_write.c Log configuration files
2） 把相关文件拷贝到android源码中
cp –pvRf ril_sc_<version>/external/ppp/ <android_root>/external/ppp
cp –pvRf ril_sc_<version>/hardware/ril/ublox_ril <android_root>/hardware/ril/
cp –pvRf ril_sc_<version>/system/* <android_root>/system
cp –pvRfril_sc_<version>/build/* <android_root>/build
3） 在device/fsl/imx6/AndroidProducts.mk中添加：
RIL_COM_INTERFACE := usb
4） 在init.rc文件中添加如下语句：
# Changepermissions for modem
chmod 0660 /dev/ttyACM0
chown radio radio /dev/ttyACM0
chmod 0660 /dev/ttyACM1
chown radio radio /dev/ttyACM1
chmod 0660 /dev/ttyACM2
chown radio radio /dev/ttyACM2
# Set permissions for u-blox RILRepository
chown radio radio /system/etc/rril
chmod 0770 /system/etc/rril
chown radio radio/system/etc/rril/repository.txt
chmod 0660/system/etc/rril/repository.txt
# Set u-blox RIL repository state
setprop net.rril.repository notready
#Prepare u-blox RIL repository
service rril-repo/system/bin/rril-repo.sh
user root
group radio
oneshot
# Load u-blox RIL
service ril-daemon /system/bin/rild -l/system/lib/librapid-ril-core.so --
-a /dev/ttyACM0 -n /dev/ttyACM1
class main
socket rild stream 660 root radio
socket rild-debug stream 660 radiosystem
user root
group radio cache inet misc audio
service pppd_data0/system/bin/init.gprs-pppd
user root radio
group radio cache inet misc
disabled
oneshot
service pppd_data1/system/bin/init.gprs-pppd
user root radio
group radio cache inet misc
disabled
oneshot
service pppd_term /system/bin/stop_pppd15
class main
disabled
oneshot
service pppd_kill /system/bin/stop_pppd 9
class main
disabled
oneshot
5） 配置menuconfig如下：
DeviceDrivers
USB Support
<*>USB Modem (CDC ACM)support
DeviceDrivers
Network device support
<*>PPP (point-to-pointprotocol) support
<*>PPP support for asyncserial ports
<*>PPP support for sync ttyports
<*>PPP Deflate compression
6） 重新编译系统，确保生成以下文件
/system/lib/librapid-ril-core.so
/system/lib/librapid-ril-util.so
/system/lib/librapid-ril-oem.so
/system/bin/pppd
/system/bin/chat
/system/bin/init.gprs-pppd
/system/bin/ip-down
/system/bin/ip-up
/system/bin/stop_pppd
/system/bin/rril-repo.sh
/system/etc/rril/repository.txt
/system/etc/ppp/ chap-secrets
/system/etc/ppp/ chat-isp1
/system/etc/ppp/ chat-isp2
/system/etc/ppp/ ip-down-ppp0
/system/etc/ppp/ ip-up-ppp0
/system/etc/ppp/ ip-up-vpn
/system/etc/ppp/pap-secrets
/system/etc/ppp/peers/gprs1
/system/etc/ppp/peers/gprs2
3.3 调试过程
1、 启动系统后，确保3G模块端口可以被系统识别：
/dev/ttyACM0
/dev/ttyACM1
/dev/ttyACM2
/dev/ttyACM3
/dev/ttyACM4
/dev/ttyACM5
2、 用ps命令查看rild进程是否启动，如果已启动，此时一般拨打电话是没问题的。
3、 在调试过程中发现不能上网，用ps命令查看，发现pppd进程未启动。在adb中用logcat –b radio查看日志发现有两处错误：
第一处错误：
E/RILR ( 2109):CRepository::OpenRepositoryFile() - ERROR: Could not open file"/data/rril/repository.txt" - No such file or directory
第二处错误：
I/pppd.gprs( 3262): Configure pppd securityoptions
I/pppd.start( 3271): Starting pppd
E/pppd ( 3272): unrecognizedoption 'gprs1'
I/pppd.start( 3279): pppd exited with2
第一处错误could not find /data/rril/repository.txt的原因是/system/bin/rril-repo.sh脚本未得到执行，解决方法是修改/system/bin/rril-repo.sh的权限，以及在init.rc中添加servicerril-repo的class属性：
# Prepare u-blox RIL repository
service rril-repo /system/bin/rril-repo.sh
class main
user root
group radio
oneshot
第二处错误unrecognizedoption 'gprs1'的原因是执行/system/bin/init.gprs-pppd脚本时出错，当$ppp_usr为空字符串时，脚本执行以下语句：
/system/bin/pppd user $ppp_usr call gprs$(( $ppp_if + 1 ))
=》
/system/bin/pppd user call gprs1
此语句执行失败，所以pppd进程无法启动。
修改后的正确的脚本为：
case $ppp_auth in
0)
/system/bin/log -t pppd.start "/system/bin/pppd call gprs$(( $ppp_if+ 1 ))"
/system/bin/pppd call gprs$(( $ppp_if + 1 ))
;;
*)
if [ "$ppp_usr" = "" ];then
/system/bin/log -t pppd.start "/system/bin/pppd call gprs$(( $ppp_if+ 1 ))"
/system/bin/pppd call gprs$(( $ppp_if + 1 ))
else
/system/bin/log -t pppd.start "/system/bin/pppd user $ppp_usr callgprs$(( $ppp_if + 1 ))"
/system/bin/pppd user $ppp_usr call gprs$(( $ppp_if + 1 ))
fi