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飞思卡尔i.MX 6Quad Android 4.2.2的中兴和Ublox 3G驱动移植

2013年03月19日 ⁄ 综合 ⁄ 共 8172字 ⁄ 字号 评论关闭

 

1      概述

平台:freescale i.MX 6Quad 4核开发板Sabre-sd(不带屏幕)

操作系统:Android 4.2.2_r1(代码补丁为android_jb4.2.2_1.1.0-ga_source)

内核:3.0.35

3G模块:中兴MG3732UbloxLISA-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)  拷贝基于android4.2的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/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
    class main
    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
 

在调试过程中,发现Log出现此句错误:

usb1-1: device v19d2 pffeb is not supported

 说明modem模块没有被识别到,但此时已在option.c中添加了这个设备属性:

{ USB_DEVICE(0x19d2, 0xffeb) }

所以怀疑可能是usb的问题。

因sabre-sd开发板只有1个usb-otg接口,没有普通的usb口,我尝试用飞线重新飞了一个普通usb口出来,把中兴3G模块接到这个普通的usb口上,这句错误log就没有再出现了。

 

2、  在系统启动后,发现log打印:

I/RIL     ( 2308): 3G modemmonitor thread is start
I/RIL     ( 2308): Opening ttydevice /dev/ttyUSB0
I/RIL     ( 2308): Runtime 3Gcan't find supported modem
E/RILC    ( 2308):RIL_register: RIL version 7
E/RIL     ( 2308): openingdata channel device - /dev/ttyFAKEPort. retrying...
E/RIL     ( 2308): openingdata channel device - /dev/ttyFAKEPort. retrying...
E/RIL     ( 2308): openingdata channel device - /dev/ttyFAKEPort. retrying...

这些log信息是在libreference-ril.so中打印的,说明系统没有调用到libztewcdma-ril.so文件。

后查看hardware/ril/rild/rild.c文件的源码,发现问题出现在main函数的switch(modem_type)语句段中。

解决方法是把switch(modem_type)语句段注释掉,重新编译rild可执行程序,即可正常地调用到libztewcdma-ril.so文件。

 

 

3、  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

4、  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android4.2的3g驱动压缩文件如下:

RIL_sc_<version>.zip
ril_sc_<version>                                Sourceoverlay for Android Platform
       build/target/product                     Device configuration folder files
       external/ppp/                            Data connection files
       hardware/gsm0710muxd                     Channel multiplexer
       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 –pvRf  ril_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 uril-repo /system/bin/uril-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/uril/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/uril-repo.sh脚本未得到执行,解决方法是修改/system/bin/uril-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 uril-repo /system/bin/uril-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,$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
 

4、  在android 4.2上作了以上修改后,发现pppd进程还未能启动,经检测,发现/system/bin/init.gprs-pppd文件未能得到执行,相关的服务在init.rc中的:

service pppd_data0 /system/bin/init.gprs-pppd
           user root radio
           group radio cache inet misc
           disabled
           oneshot

Disabled表示服务暂停执行,等待property_set("ctl.start", "pppd_data0")的时候才执行,说明可能是初始化系统的时候出现了问题。

我重新编译system/core/init目录,发现不能编译通过,报错如下:

undefined reference to watchdogd_main

因/system/core/init/property_service.c和/system/core/init/Android.mk文件都是ublox驱动文件修改过的,所以我仔细查看这两个文件,发现是Android.mk文件出现问题,ublox提供的Android.mk文件是针对android 4.1的,并不是4.2,在LOCAL_SRC_FILES中缺少了watchdogd.c文件,修改Android.mk文件如下:

1)    在LOCAL_SRC_FILES中添加watchdogd.c

2)      在SYMLINKS中添加$(TARGET_ROOT_OUT)/sbin/watchdogd

然后重新编译system/core/init,生成root/init程序,pppd进程即可成功启动,并可使用3G网络。

 

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