DM365+EC122调试（二）

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本文详细记录了在瑞泰DM365开发板上调试EC122 3G模块的过程，包括运行usb_modeswitch、创建/var/lock目录以及使用wvdial拨号等步骤，最终成功解决设备资源忙的问题。

硬件平台：瑞泰DM365开发板

开发板内核：Linux 2.6.18

DVSDK版本：2_10_00_17

问题2：

Cannot open /dev/ttyUSB0: Device or resource busy

Cannot open /dev/ttyUSB1: Device or resource busy

Cannot open /dev/ttyUSB2: Device or resource busy

……

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继上一篇《 DM365+EC122调试（一）》，这篇继续在DM365板子上调试EC122。现在开发板加载的是NandFlash上的文件系统。

第一步，运行 usb_modeswitch -W

     Target device description data
      -------------------------
      Manufacturer: HUAWEI TECHNOLOGIES
     Product: HUAWEI Mobile
     Serial No.: 
     -------------------------
      Found correct target device

Mode switch succeeded. Bye.

Oh, Shit ! 竟然出现上面这些信息，而且还没有引起OOM Killer。于是reboot，再次usb_modeswitch -W，仍然没有引起OOM Killer。太好了，似乎感觉马上就能调好3G模块了。在 /dev/tts/ 目录下多了 USB0、USB1、 USB2、 USB3这么四个节点。

恩，试试 wvdial 吧。于是运行 wvdialconf /etc/wvdial.conf ，新问题又来了，就是上面的那个“问题2 ”。我的天啊，不要这么折磨我好吗，我好想赶紧写论文啊！

坚持不懈的搜索网上的解决办法，终于看到这么个标题《 [SOLVED] HSDPA Huawei E220 and wvdial: Device or resource busy》。此时，看到那个 [SOLVED]是多么的让我欣喜啊！引用其中的关键内容：

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Hey, I just recently went through this and it nearly drove me nuts, had the 'device busy' problem even for root. After many, many days and several aneurysms I finally found my problem, maybe this will help you too.

It turned out that wvdial tries to create a lock file for the usb device in '/var/lock', but for some reason when I looked in '/var' I had no 'lock' directory. I checked my other Arch machine and it has a '/var/lock' directory, so I'm not sure where this one disappeared to.

Soon as I created ' /var/lock ' wvdial worked perfectly. Hope this helps you out.

Cheers,
Wittfella

Last edited by Wittfella (2009-06-16 15:45:48)

----From https://bbs.archlinux.org/viewtopic.php?id=74163

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赶紧的查看自己的文件系统，哦，的确没有找到' /var/lock '，果断创建吧。并且，手动的在 /dev 目录下建立了 ttyUSB0 ttyUSB1 ttyUSB2 ttyUSB3这四个符号链接，分别对用 /dev/tts/ 目录下的 USB0 USB1 USB2 USB3。重新运行 wvdialconf /etc/wvdial.conf 正确找到了 ttyUSB0 ，然后就是运行 wvdial ，一切OK，拨号成功！

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--> WvDial: Internet dialer version 1.61
--> Warning: section [Dialer [08]conf] does not exist in wvdial.conf.
--> Warning: section [Dialer /etc/wvdial.conf] does not exist in wvdial.conf.
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT#777
--> Waiting for carrier.
ATDT#777
CONNECT 3100000
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Thu Jan 1 00:17:15 1970
--> Pid of pppd: 833
--> Using interface ppp0
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> local IP address 49.92.62.141
--> pppd: [08]x[03]
--> remote IP address 172.25.8.25
--> pppd: [08]x[03]
--> primary DNS address 218.2.135.1
--> pppd: [08]x[03]
--> secondary DNS address 61.177.7.1
--> pppd: [08]x[03]
Caught signal 2: Attempting to exit gracefully...
--> Terminating on signal 15
--> pppd: [08]x[03]
--> Connect time 0.5 minutes.
--> pppd: [08]x[03]
--> pppd: [08]x[03]
--> Disconnecting at Thu Jan 1 00:17:45 1970
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