Ok, guess it's time for my "problem of the month" post. :)
I've recently been attempting to access /dev/ttyS0, but for some
strange reason, Linux always reports that it's busy. Odd -- I have
/dev/ttyS0-2, and ttyS1 and 2 are the only two ports being used.
So I ran fuser/lsof to learn what might be grabbing the port. fuser
shows that ttyS1-2 are being accessed, but not ttyS0.
On a hunch, I killed my PPP connection (which uses ttyS2), and
amazingly, ttyS0 became available. Anyhow, I can't quite figure out
how my modem's use of ttyS2 could effect ttyS0. Here is what dmesg
says about my serial ports:
Serial driver version 4.27 with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
ttyS02 at 0x03e8 (irq = 4) is a 16550A
So, it looks as if there shouldn't be any conflicts, except for the
IRQs being shared by both, but doesn't the fact that they're using
different addresses make that possible? If not, what should I do to
fix this?
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