We have 2.6.29-ts, and notice that the IRQ counts in /proc/interrupt go
absolutely wild when we attempt to insert a 0.2 second, TTL/CMOS level signal
onto pin A21 of the PC104 connector of the TS-7260.
When the square wave voltage goes high, the system load goes up so much that
the shell freezes until the voltage drops, at which time the count in
/proc/interrupts has jumped like it does each time the voltage goes to 5, by
about 397,000 in 0.2 seconds!!
First place I looked was into Matthieu's patch set release notes, where I find
these curious words:
"2.6.29 suppress one more patch "ep93xx_debounce_irq". It does not add much
compared to 2.6.28.x
DMA engine is not included yet."
"debounce ?!?" Is that why we get so many interrupts in a row? Some kind of
contact bounce? Are we missing a driver we need from the set built by
Matthieu's chipset? Does this mean we can't have DMA at 2.6.29, or not at all?
Any wise words would be greatly appreciated, thanks!
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