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Re: plugin USB device doesnot loads the KEXT.Help required!
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Re: plugin USB device doesnot loads the KEXT.Help required!

  • Subject: Re: plugin USB device doesnot loads the KEXT.Help required!
  • From: "rohit dhamija" <email@hidden>
  • Date: Tue, 26 Sep 2006 20:31:20 +0530
Hi Fernando,
 
I didnot tried to spam actually. I was doubtful , in which category this questions BEST fits into. So i sent the same question to 3 lists.
 
B/w i shall be thankful if you could please share your comments for the query. ?Below are the brief steps
1) I copied my kext in  /System/Library/Extensions
2) I loaded the same using "kextload" command
3) My USB bulk device was already plug-in. So it detects my device and loads successfully.
4) Now I plug-out my device and wait for more than 2-3 minutes. In this duration the kextunloads itself.
5) Now when I plug-in the device again, the KEXT no more loads itself.
 
Why ? Please help.
Rohit

 
On 9/26/06, Fernando Urbina <email@hidden> wrote:
Please stop spamming 3 lists with your same question.  Choose one and ask your question there.

--

Fernando Urbina

USB Technology Team

Apple Computer, Inc.


On Sep 26, 2006, at 1:14 AM, rohit dhamija wrote:

Dear All,
 
I have developed a KEXT for my USB Bulk Device to support for Mac OS X 10.3.9 ppc and Mac OS X 10.4.7 ppc and Intel. Encountering a tricky issue and want your suggestions to resolve the same. The issues is very easily reproducable on Mac OS X 10.3.9.
 
If I plug-out my USB bulk device and close the applications using it, my KEXT gets unloaded. Now if I immediately (less < 1 minute) plugin the device, the KEXT detects the device and everything works fine.
 
On the other hand if I plugin my USB device after some time ( > 2 minutes), my "KEXT NO MORE GETS LOADED" :(
The device LED no more blinks, and kextstat doesnot show my KEXT entry. 
 
Below are the entries shown in system.log, when I plugin the device after long time
>tail -f /var/log/system.log
 
shows following entries:
 
"MyCompany MyKEXT: family specific matching fails
last message repeated 5 times
MyCompany MyKEXT: Stalling for module
Cannot find extension with id com.MyCompany.MyKEXT.My"
 
I am simply stuck!!! I know that the Mac OS kernel unloads the drivers itself when they are not in use. But the drivers should get loaded itself when the USB device is plugged in.
 
What can be the possible reason for KEXT being not loaded again ??
Did any body encoutered similar issue before ? Or I am doing somewhat wrong??
Please send your suggestions / comments for the same. Also do let me know in case further clarification is required in this regard.
 
Thanks and Regards,
--
Rohit Dhamija(M) 9818446545
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Rohit Dhamija(M) 9818446545 
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      • From: "Herb Petschauer" <email@hidden>
References: 
 >plugin USB device doesnot loads the KEXT.Help required! (From: "rohit dhamija" <email@hidden>)
 >Re: plugin USB device doesnot loads the KEXT.Help required! (From: Fernando Urbina <email@hidden>)

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