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Re: serial port too fast for Core Duo?



On Fri, Dec 19, 2008 at 03:49:26PM -0500, Dr. Michael J. Chudobiak wrote:
> I have an oscilloscope with a 19200 bps serial port on it. It works fine 
> with my old Windows 2000 computer.
> 
> But it will not work with the on-board serial port on my shiny new HP 
> DC7900 with Fedora 10! 19200 bps is too fast, and the data is always 
> (slightly) corrupted, regardless of what sort of flow control is used.
> 
> Using a USB-to-RS232 dongle works, presumably because the dongle has a 
> larger buffer than the normal 16 byte UART.
> 
> Can linux really not handle a 19200 serial port transmission, without 
> resorting to obscure IRQ re-prioritization hacks?
> 
> - Mike

I've run a modem, fo ryears, at 115200bps on old hardware, like a Pentium-90
and a K6-2/350 without trouble.

Many years ago I encountered a problem with an add-in serial port that
had been given some non-standard (as serial ports go) IRQ, where its IRQ
had such a low interrupt priority that it couldn't keep up. thre was some
tool I found to reset those priorities. I have no recollection what the
tool was, or if it is even needed anymore.

but, no, Linux doesn't (or certainly didn't) have trouble with fast serial
data.

-- 
---- Fred Smith -- fredex fcshome stoneham ma us -----------------------------
                    The Lord detests the way of the wicked 
                  but he loves those who pursue righteousness.
----------------------------- Proverbs 15:9 (niv) -----------------------------

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