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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