You could try ktrace and try to figure out what's going on.

	-- Lennart

Michael Kukat wrote:
> Hello,
> 
> i'm trying to connect my SE P800 to my Alpha running NetBSD 2.0, but this
> doesn't fully work as i expect. I have a very strange problem with ttyU0 and
> dtyU0. So, first, the dmesg excerpt:
> 
> uftdi0 at uhub0 port 3
> uftdi0: Sony Ericsson SEMC DSS-20 SyncStation, rev 1.10/4.00, addr 2
> ucom0 at uftdi0 portno 1: portno 1
> 
> So far, so good. If i set the phone to "Modem", 115200 KBps, everything works
> completely perfect. At least with cu. But if i set the phone to "PC
> Connection", things look a bit different:
> 
> cu - absolutely nothing. Tried dtyU0, ttyU0, tried -f, -F, tried --nostop,
> tried really nearly everything.
> pppd - this is what shall go on the line if everything works (mRouter protocol
> there). Works fine in this setup with the serial cable, but not with the USB
> cradle.
> tip - same as cu. Nothing.
> minicom - everything works perfectly
> 
> So, i played around with minicom, enabled/disabled hardware flow control, but
> it's not possible to get it _NOT_ working correctly there. Exactly the opposite
> in all other tools.
> 
> Before i now read the minicom source... maybe someone had a similar problem
> with a maybe different configuration, and finally found out what this could be.
> Or maybe at least someone has a nice hint to tell, where can i look further.
> 
> As said, cu in general works, it's just the PC Connection mode of the phone,
> which just works with minicom.
> 
> ...Michael
>