Option error

Peter Stuge stuge-linux-pcmcia at cdy.org
Sun Oct 8 14:31:02 EDT 2006

On Sun, Oct 08, 2006 at 03:30:23PM +0200, Dariusz Dwornikowski wrote:
> pcmcia: the driver needs updating to supported shared IRQ lines.
> 0.0: ttyS2 at I/O 0x3e8 (irq = 11) is a 16550A

The above is indeed the source of your problems. The root evil is
that the PC architecture has way too few IRQ lines (signals from IO
devices to the CPU that something has happened in the IO device, like
that data has come in or that it's now ok to send more data) and
computer makers don't care about spending extra $ to improve only
slightly on the situation by designing mainboards more carefully.

Software has to deal with the problem (checking which of several IO
devices actually yanked the IRQ line) but not all of the Linux PCMCIA
card drivers in 2.6 do this yet.


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