3Com Modem + Realtek Network
I had trouble at first getting a 3Com 5610 modem
to work with Debian Woody,
but I was able to solve that for a while.
It turns out that the 5610 wants to work on /dev/ttyS4
Woody does not create this, by default.
I read the Serial-HOWTO from TLDP and
it told me how to create /dev/ttyS4.
This was easy, this was good to learn.
Then setserial /dev/ttyS4 identified a UART.
And pppconfig autodetected the modem,
and I dialed an IP and reached the Internet. Good.
But then I setup a Realtek 8139(A) network adapter.
I did not specify parameters to the module and
it autoconfigured to irq 5 and ioport 0xb400.
Now the modem does not work,
Woody autoconfigures /dev/ttyS4 to irq 2 and ioport
but this does not work;
setserial /dev/ttyS4 lists UART unknown.
Under winME, the modem works on COM5, IRQ 10 and IO B000.
I tried to set these parameters with:
setserial /dev/ttyS4 port 0x4000 irq 10,
and these parameters do get set,
but the modem does not work.
The Realtek uses irq 5 and ioport 0xb400-b4ff
cat /proc/ioports does not list anything at 0xb000.
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