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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