[avrdude-dev] [bug #30753] bsd programmer causes PCI parport to bring interrupt storm to Linux

[Guan Xin]

URL:
  <http://savannah.nongnu.org/bugs/?30753>

                 Summary: bsd programmer causes PCI parport to bring
interrupt storm to Linux
                 Project: AVR Downloader/UploaDEr
            Submitted by: cppgx
            Submitted on: Wed 11 Aug 2010 10:56:18 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Xin Guan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

bsd programmer uses ACK line for input. With my "NetMos Technology PCI 1 port
parallel adapter (rev 01)", this will generate infinit interrupts during and
after programming.

On Linux 2.6.34.* I can see "hi" taking a good portion of CPU time in "top".
On Linux 2.6.35.*, "hi" takes 0.0% CPU time. However, in both cases the system
is slowed down by more than 70%. The same problem does not occur when I use
the traditional ISA parport on the same computer (with the bsd programmer).

By changing MISO to line 12 (paper out), the problem is solved.





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