i got a multi-port serial card (MSC) connected to a mother board via PC/104 ISA
bus. there are eight serial ports on the MSC, but any of them can only be
associated with ttyS2 or ttyS3 (i did not tried ttyS0,1 for they are already
used by the mother board itself). if i associated (via setserial command) any
of them to ttyS4+, a very _long delay_ will be detected on both direction of RX
and TX.

those ports all shared a common irq (not occupied by other devices) but with
different io base address. i doubt there is a kernel configuration problem,
but i just have no a clue.

the version of linux kernel is 2.2.x (yes, it too old, but we used it with
some other brand of multi-port serial boards w/o problem).

any clue? thanks in advance.


--
steven woody (id: narke)

Angelica Bell: What happens to us when we die?
Virginia Woolf: ... We return to the place we came from.
Angelica Bell: I don't remember where I came from.
Virginia Woolf: Neither do I.

- The Hours (2002)

["Followup-To:" header set to comp.unix.programmer.]
On Wed, 21 Sep 2005 20:43:56 +0800, Steven Woody
<anti-spam.narkewoody@gmail.com.dont-post-to> wrote:
>
> i got a multi-port serial card (MSC) connected to a mother board via
> PC/104 ISA bus. there are eight serial ports on the MSC, but any of
> them can only be associated with ttyS2 or ttyS3 (i did not tried
> ttyS0,1 for they are already used by the mother board itself). if i
> associated (via setserial command) any of them to ttyS4+, a very _long
> delay_ will be detected on both direction of RX and TX.
>
What brand of multi-port serial card? Some multi-port cards use their
own device names rather than ttyS*. See devices.txt.gz in your kernel
documentation. I don't know about Slackware, but in Debian-based
systems, when you install the kernel-doc package, the docs are in
/usr/share/doc/kernel-doc-(version)/Documentation, or
linux-doc-(version) for newer kernels.


--
Men of quality are not afraid of women for equality.