Date: Sat, 17 Nov 2007 19:06:02 +0800 From: "Xiaofan Chen" <xiaofanc@gmail.com> To: "Hans Petter Selasky" <hselasky@c2i.net> Cc: freebsd-usb@freebsd.org Subject: Re: OpenUSB for FreeBSD? Message-ID: <a276da400711170306q38bf1698lfe92e450ce9291a@mail.gmail.com> In-Reply-To: <200711170938.28339.hselasky@c2i.net> References: <a276da400711111902v36856882m428d495ce208e559@mail.gmail.com> <20071112095326.GA85828@tirith.brixandersen.dk> <a276da400711142220w2450fdb1leb2a73bf2921a4e2@mail.gmail.com> <200711170938.28339.hselasky@c2i.net>
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On Nov 17, 2007 4:38 PM, Hans Petter Selasky <hselasky@c2i.net> wrote: > > Could you be a bit more specific? I know there are some missing calls > > in FreeBSD. And I have problems with libusb interrupt write with the > > default kernel (hangs). It is documented here. > > http://lists.freebsd.org/pipermail/freebsd-usb/2007-November/004128.html > > But I am not so sure if it is a libusb problem or the kernel USB driver > > problem. > > The problem about clear stall on the interrupt endpoint is a pure device > problem. Your USB device must re-queue any lost interrupt packets after clear > stall! Sorry but that problem does not occur using the HPS stack but the stock FreeBSD 7 Current kernel (actually in FreeBSD 6.1 and 6.2 as well last time I tried it). Under HPS stack, it works. And I remember that Warner said that the Current kernel does not clear stall. Quote from http://lists.freebsd.org/pipermail/freebsd-usb/2007-July/003751.html Warner Losh wrote: "Remind me when is this clear endpoint stall sent? In 7.x we don't send one on pipe open unless the device is quirked to require one. On RELENG_6, at least as of today, we never send one on the open." Xiaofan
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