On 7/8/09 8:18 AM, "Spencer Oliver" <[email protected]> wrote:
>> You asked me what the result of Spencer's patch was under Mac
>> OS X. I tested it against my system this evening and as you
>> will see below, it caused a number of startup faults. It
>> also appears to make the j-link dongle completely
>> unresponsive thereafter.
>>
>> I guess the bigger question is this. Did the Windows version
>> ever suffer from the intermittent startup problem or was this
>> exclusively a problem with Linux/Mac systems?
>>
>> If Windows doesn't need the usb_reset and doesn't suffer from
>> the intermittent issue, doesn't it make more sense to put a
>> conditional around it that excludes that step for windows
>> rather then forcing the device search again?
>>
>>
>> Info : J-Link initialization started / target CPU reset initiated
>> Error: J-Link command 0xde failed (-13)
>> Error: J-Link command 0xdc failed (-13)
>> Error: J-Link command 0x01 failed (-13)
>> Error: J-Link command EMU_CMD_VERSION failed (-13)
>>
>> Info : J-Link JTAG Interface ready
>> Error: J-Link command 0xdd failed (-13)
>> Error: J-Link command 0xdf failed (-13)
>> Error: J-Link setting speed failed (-13)
>> Error: usb_bulk_write failed (requested=6, result=-13)
>> Error: jlink_tap_execute, wrong result -107 (expected 1)
>> Error: usb_bulk_write failed (requested=6, result=-13)
>> Error: jlink_tap_execute, wrong result -107 (expected 1) .
>> .
>> .
>>
>
> Strange, i fail to see why my patch would cause this.
> I have only tested the patch on linux and win32 and it works fine on these.
>
> All the patch does is re-enumerate after the usb_reset.
> Could you step through and see that a valid handle is returned?
>
> Cheers
> Spen
Hi Spencer,
The problem for Mac OS X starts when the second usb_open call is made after
re-enumeration. Based on my testing the second call returns a valid handle.
Unlike the first handle, however, it is a zombie since anything using it
ends up in a permanent black hole. If I comment out that single line, your
patch works OK.
The problem is I am guessing that statement is critical to Windows operation
or you would not have likely put it in there.
I am trying some other things, to see if I can find a solution that works
across all three platforms. What a pesky problem.
Gary
Gary Carlson
Gary Carlson, MSEE
Principal Engineer
Carlson-Minot Inc.
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