Date: Tue, 18 Jan 2005 13:18:54 +0100 From: Milan Obuch <bsd@dino.sk> To: freebsd-current@freebsd.org Subject: Re: strange ucom (uplcom) error Message-ID: <200501181318.57177.bsd@dino.sk> In-Reply-To: <200501181306.49120.emanuel.strobl@gmx.net> References: <200501181306.49120.emanuel.strobl@gmx.net>
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On Tuesday 18 January 2005 13:06, Emanuel Strobl wrote: > Dear experts, > > I have two USB-RS232 Adaptors, both with PL2303 chipset. One is working the > other one not (I hate to say it but both are working under win). > > The not working (more expensive) one gets recognized as ucom0 and I have > ucom0, also I can receive signal but not transmit. > > When I connect the (more expensive) adopter to a serial console (FreeBSD > comconsole) I can see all kernel messages but I can't type any charecter > when I see the login. If I change to the cheaper adopter everything is > working fine. I compared 'stty -a -f /dev/ucom0' and both adaptors show the > same settings. > > I'm using tip (ucom0:dv=/dev/ucom0:br#115200:pa=none:) on RELENG_5 (from > this weekend) > Hi, I am by no means an expert here, just couple of my observations. I have two Prolific2303 adapters and they exhibit both some peculiarity. I use minicom for serial communication. With my pl2303 based adapters, I must first start minicom, change something (toggle harware flow control as an example) and after that, I can use the adapter. Without this, no characters are seen, however, what I type is send to the other side. There is something incorrect in USB stack maybe, but with this workaround I can live with this. I have no possibility to investigate further, if someone, however, makes a path to be tested, I can do it. Regards, Milan
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