DM365+EC122調試（二）

硬體平台：瑞泰DM365開發板

開發板核心：Linux 2.6.18

DVSDK版本：2_10_00_17

//

問題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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    繼上一篇《 DM365+EC122調試（一）》，這篇繼續在DM365板子上調試EC122。現在開發板載入的是NandFlash上的檔案系統。

    第一步，運行 usb_modeswitch -W

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

      Mode switch succeeded. Bye.

    Oh, Shit ! 竟然出現上面這些資訊，而且還沒有引起OOM Killer。於是reboot，再次usb_modeswitch -W，仍然沒有引起OOM Killer。太好了，似乎感覺馬上就能調好3G模組了。在 /dev/tts/ 目錄下多了 USB0、USB1、 USB2、 USB3這麼四個節點。

    恩，試試 wvdial 吧。於是運行 wvdialconf /etc/wvdial.conf ，新問題又來了，就是上面的那個“問題2 ”。我的天啊，不要這麼折磨我好嗎，我好想趕緊寫論文啊！

    堅持不懈的搜尋網上的解決辦法，終於看到這麼個標題《 [SOLVED] HSDPA Huawei E220 and wvdial: Device or resource busy》。此時，看到那個 [SOLVED]是多麼的讓我欣喜啊！引用其中的關鍵內容：

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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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    趕緊的查看自己的檔案系統，哦，的確沒有找到' /var/lock '，果斷建立吧。並且，手動的在 /dev 目錄下建立了 ttyUSB0 ttyUSB1 ttyUSB2 ttyUSB3這四個符號連結，分別對用 /dev/tts/ 目錄下的 USB0 USB1 USB2 USB3。重新運行 wvdialconf /etc/wvdial.conf  正確找到了 ttyUSB0 ，然後就是運行 wvdial
，一切OK， 撥號成功！

 

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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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    痛苦的調試過程終於有了一些令人稍稍滿意的結果了。

    好了，本文結束了，今後還會有其他調試記錄！

2012-05-04