Date: Fri, 21 Jun 2013 23:07:07 +0200 From: Hans Petter Selasky <hps@bitfrost.no> To: Mike Meyer <mwm@mired.org> Cc: freebsd-usb@freebsd.org Subject: Re: Issues 179505 Message-ID: <51C4C07B.7040507@bitfrost.no> In-Reply-To: <CAD=7U2BX-FjghRjizr49Ow8-Cv4A_B21gucCrsu_JKQp_XkPhQ@mail.gmail.com> References: <CAD=7U2DDbjqC67%2BMecVNCtoUEF5CNeCj8HaK_6%2BYMZ=PZVbusA@mail.gmail.com> <20130621195542.7d9103859f9edcbd1bd8b4d8@getmail.no> <20130621200326.ba4a8fd0e4b300b8b77c836e@getmail.no> <CAD=7U2D%2B0_3JFdGaOyxBhCtgqFcQe-d=5DKD8t1u0XiSPuhNHQ@mail.gmail.com> <CAD=7U2BX-FjghRjizr49Ow8-Cv4A_B21gucCrsu_JKQp_XkPhQ@mail.gmail.com>
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On 06/21/13 20:17, Mike Meyer wrote: > Sorry 'bout the extra emphasis there. > > Anyway, the problem is not *simply* the sketch code. It could be > something in the Arduino bootloader violating a USB spec that Linux > doesn't care about and FreeBSD does. But mucking about with the user > code on the Arudino (i.e. - sketches) doesn't change anything: I get > the same behavior whether it's running a trivial Blink demo (pretty > much no libraries used at all) or a complete interactive shell: > > It works as expected when connected to Linux running on a VBox VM, > with the umodem device always being present. > > If I don't connect it to the VM, the umodem device appears when the > board is plugged in or reset, then disappears before the sketch starts > running. Hi, I think I have one of these devices at work. I can have a look if I have time next week. Possibly the Arduino needs a fix. Look for so-called spurious VBUS pullup toggling in the software of the Arduino. --HPS
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