bugAVR Downloader/UploaDEr - Bugs: bug #49376, Resource busy error on El Capitan


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bug #49376: Resource busy error on El Capitan

Submitted by:  None
Submitted on:  Mon 17 Oct 2016 08:33:00 PM UTC  
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Originator Name:  Serjio
Originator Email:  -email is unavailable- Open/Closed:  Open
Release:  6.3 Programmer hardware: 
Device type: 

Mon 17 Oct 2016 10:05:05 PM UTC, comment #2:

Indeed, as far as I know from Arduino-related forums (when investigating a similar issue - cdc comms are also buggy in El Capitan - I bumped into complains that their environment/projects stopped working after upgrade to El Capitan) - it turns out that starting 10.11 Apple somehow changed the way OSX works with usb (enumerates usb?). Besides, they removed tty devices.
Do you mean to say that avrdude needs tty to work properly?
Anyway, I though there were some users of avrdude running El Capitan - wanted to learn if they face such problem and their solutions...

serjio <serjio>
Mon 17 Oct 2016 09:48:39 PM UTC, comment #1:

Maybe the operating system now has some service (or whatever)
that is immediately grabbing a TTY device once it appears?

Alas, I'm afraid that's nothing which can be solved in
AVRDUDE, rather a kind of OS issue. At the very least, it
requires someone with more insight into OSX.

Joerg Wunsch <joerg_wunsch>
Project Administrator
Mon 17 Oct 2016 08:33:00 PM UTC, original submission:

Tested on two laptops with El Capitan with the same error. Works smoothly on Yosemite.

avrdude -c stk500v2 -P /dev/cu.usbmodemavrdope1 -p attiny85
avrdude: ser_open(): can't open device "/dev/cu.usbmodemavrdope1": Resource busy



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