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@xxxxxxxxxxxxxxxxxxxxxx ----------------------------- The Lord detests the way of the wicked but he loves those who pursue righteousness. ----------------------------- Proverbs 15:9 (niv) -----------------------------
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