Date: Fri, 09 Sep 2005 15:51:21 -0400 From: Mike Tancsa <mike@sentex.net> To: Paul Marciano <pm940@yahoo.com> Cc: freebsd-questions@freebsd.org, freebsd-usb@freebsd.org Subject: Re: Will USB serial ever be fixed? Message-ID: <6.2.3.4.0.20050909152156.05cfd970@64.7.153.2> In-Reply-To: <1126292392.11649.5.camel@realtime.exit.com> References: <20050909170944.77242.qmail@web54002.mail.yahoo.com> <1126292392.11649.5.camel@realtime.exit.com>
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At 02:59 PM 09/09/2005, Frank Mayhar wrote: >On Fri, 2005-09-09 at 10:09 -0700, Paul Marciano wrote: > > I have a general question on the status of USB to > > serial support in FreeBSD (specifically the ucom and > > ftdi drivers). > > > > I need an extra serial port on my system and for > > reasons outside the scope of this email I can't just > > plug in a PCI card. I'm trying to use USB, but it > > seems that ucom is broken and no one is fixing it. > > > > A tcflush() bug posted last year reports that USB > > serial ports hang on a call to tcflush(). This can be > > observed by using getty on one. > > > > Another poster reported problems running PPP > > (including a kernel crash). > >Well, I've got a handful of such devices that appear to work just fine. >Now, mine are based on the Prolific PL-2303* chips but you don't mention >any specific hardware. All I know is that I'm using them for consoles >(and am running getty on them) with no hangs or crashes of any kind. I am using the 2 port serial USB card from http://www.byterunner.com/ and it works quite well on RELENG_5 and RELENG_6 ucom0: FTDI USB FAST SERIAL ADAPTER, rev 2.00/5.00, addr 3 ucom1: FTDI USB FAST SERIAL ADAPTER, rev 2.00/5.00, addr 3 There were a number of fixes that went into RELENG_5 that fixed panics that I was seeing. I use this ucom device presently to access 2 servers without any issues If you can provide more detail as to exactly what you were doing to trigger the panic, I can try and reproduce it on my gear here to see if its fixed or not. ---Mike
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