Date: Fri, 29 Oct 1999 10:01:20 +0200 (MET DST)
From: Jean-Paul Le Fevre <[EMAIL PROTECTED]>
Still trying to figure out why my modem does not work correctly
under Linux I read in the Dell documentation that the UART
controlling the serial port is "compatible 16550C".
Don't know what this C means. None of the doc I've read mentions
this type of UART. When I run "setserial autoconfig" the UART
is found as being 16550A.
- Can this be the cause of my difficulties ?
Probably not. The 16550C from a programming level should like pretty
much like a 16550A.
- I've spent a lot a time to check, recheck, rerecheck ...
IRQs, flow control, etc. Everything seems normal. Is there a way
to examine if the serial driver works fine or not ?
(The symptom is : seemingly erratic data transfert hence very slow
connection)
The first thing I'd be suspicious about is the whether the interrupt is
set correctly. Sometimes the IRQ autoconfiguration (if you use it ---
this is why I don't really recommend using it) fails, and you're left
with irq 0, which would have these symptoms. If there is also anything
interfering on that particular IRQ, that might also be a cause of your
problems.
- Ted
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