Assuming you do manage to get your modem configured to look like it is on the right IRQ and IObase for the traditional COM2 ...I'm actually a bit surprised to see that Mandrake does something to fiddle with the conventional settings for /dev/ttyS1. But ...
At 02:44 PM 6/8/2003 -0700, Richard Dawson wrote:
Something that is complicated by the fact that I have to use setserial each time I boot in order to have Linux use the "standard" IRQ for ttyS1. (ttyS0 is associated with IRQ3 as one might expect).
This "one" would expect no such thing. ttyS0 is supposed to be the Linux analog to COM1, which means it should have these settings:
kuryakin:~# setserial /dev/ttyS0
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4Similarly, ttyS1 is the analog to COM2, with these default settings:
kuryakin:~# setserial /dev/ttyS1
/dev/ttyS1, UART: 16550A, Port: 0x02f8, IRQ: 3(The UART entry is not part of the default; the presence of a UART entry normally means that the kernel has actually found a serial device at that IRQ/IObase location.)
So my questions: (1) Am I missing something? Am I barking up entirely the wrong tree?
If you are fiddling blindly with jumpers, it is likely that you are changing the IObase assignments in unpredictable ways. Both IRQ -AND- IObase have to match what setserial expects to access a serial device.
(2) Where can I put a setserial command in order that Linux boots up with IRQ 4 associated with ttyS1?
In an init script. On my Debian systems, I add this sort of local stuff to /etc/init.d/rclocal
and make a symlink pointing to that from
/etc/rc2.d/S99zlocalInit-directory setups vary a bit by distro, so you will have to check for the exact locations Mandrake uses to correspond to these.
(BTW, I assume you meant IRQ 3, not "IRQ 4", in the question.)
(3) Has anyone else experienced this confusion with the modem that I am using? (I have submitted a rquest for ino to US Robotics)
(4) Anything else relevant that might help.
I don't know your mobo, but if it has pci slots as well as isa alots, you might check the BIOS to make sure that IRQ 3 is being made available to isa-slot devices. Just disabling the on-mobo COM2 (IRQ3) serial port might not be enough to accomplish this.
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