Ed Vance wrote:
> On Tue, September 10, 2002 at 3:22 PM, Dan Christian wrote:
>
>>I've got a 2.4.18-10 (RedHat) running on a 2 processor Athlon (1.5Ghz).
>>If I send data over a PCI 16654 serial card (Connect Tech Blue Heat) and
>>RTSCTS flow control is used, characters are dropped. The drops are
>>pretty consistent. As far as I can tell, the data can only be lost in
>>the driver (I'm re-trying the write until all the data gets out).
>>
>>If I use a 16550, then everything is fine. Unfortunately, I can't get
>>rid of the 16654s.
>>
>>If is use a 1 processor Athlon running 2.4.9-34 (RedHat), then
>>everything is fine.
>>
>>I haven't been about to test the 2.4.18 SMP system in single processor
>>mode, because the IO-APIC goes nuts. But that's another bug...
>>
>>Anybody know why the serial driver is losing data?
>>
>>I'm not on linux-kernel, so please reply directly.
>
>
> Hi Dan,
>
> We use Exar ST16C654D chips on a cPCI 16-port mux we build and have not
> (yet) had a problem report on it for this. Maybe I can reproduce the symptom
> on this board. What vendor marking is on your UARTs? Could you tell me more
> about your test setup and specifically how often data is dropped and how
> many characters are dropped each time? What kind of device is receiving the
> data and how much receive FIFO does it have left when it drops RTS to tell
> the Blue Heat to stop?
>
> Best regards,
> Ed
>
> ----------------------------------------------------------------
> Ed Vance serial24 (at) macrolink (dot) com
> Macrolink, Inc. 1500 N. Kellogg Dr Anaheim, CA 92807
> ----------------------------------------------------------------
>
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