Date: Tue, 28 Nov 2006 16:30:18 GMT From: puc-uart@oldach.net (Helge Oldach) To: freebsd-i386@FreeBSD.org Subject: Re: i386/105616: UART PCI device just silent... Message-ID: <200611281630.kASGUIZr088450@freefall.freebsd.org>
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The following reply was made to PR i386/105616; it has been noted by GNATS. From: puc-uart@oldach.net (Helge Oldach) To: xcllnt@mac.com (Marcel Moolenaar) Cc: FreeBSD-gnats-submit@FreeBSD.org Subject: Re: i386/105616: UART PCI device just silent... Date: Tue, 28 Nov 2006 17:21:43 +0100 (CET) Hi Marcel, >> If it helps, I can place this card in a test machine over here for a >> couple of days and plug some serial device to it, so that you can play >> with it from remote. That may take a day or two to set up however. > >That would definitely help. If you have a cross-over cable then you >can connect both UART interfaces with each other, Thats a good point. I tried this with the current machine - and it works! I'm completely astonished. I can send characters in either direction. Both lines are stty clocal -crtcts (as it should with cu), so there is likely no hardware flow control issue. I rewired the line to the Cisco router with a LED box inbetween - and I see both RX and TX flicker when I send characters from the appropriate direction. So data is clearly transmitted. Again, control signals are fine. I cross-checked this with the sio kernel - exactly the same control signals, exactly the same behaviour. The only thing that may be botched is speed, or potentially also parity or stop bits. Again I iterated all possible speeds and also played around with parity & stop bits on the Cisco end, but no success. I suspect that with the cross-over cable bith UARTs have some arbitrary, non-common clocking so that it works in that scenario. Any ideas? Helge
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