From owner-freebsd-stable@freebsd.org Mon Aug 13 20:15:33 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2297B107C5CC for ; Mon, 13 Aug 2018 20:15:33 +0000 (UTC) (envelope-from alexander.lochmann@tu-dortmund.de) Received: from unimail.uni-dortmund.de (mx1.hrz.uni-dortmund.de [129.217.128.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "unimail.tu-dortmund.de", Issuer "TU Dortmund CA - G01" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 819C58AF8C for ; Mon, 13 Aug 2018 20:15:32 +0000 (UTC) (envelope-from alexander.lochmann@tu-dortmund.de) Received: from [192.168.111.103] (p2E513D0F.dip0.t-ipconnect.de [46.81.61.15]) (authenticated bits=0) by unimail.uni-dortmund.de (8.16.0.21/8.16.0.21) with ESMTPSA id w7DKFUN0023556 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Mon, 13 Aug 2018 22:15:30 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tu-dortmund.de; s=unimail; t=1534191330; bh=Gjveoex+wxapfBoUnLkK2EmnRGUYsMkorvNuhIlf0mk=; h=Subject:To:References:From:Date:In-Reply-To; b=rzboyU/sreJCqAHiQ6Vh9LPI4TCKqFhRqvDFjfozOyfNs+em1g3cqHihK1dsnbrYm FHST+nvXkVfxb8lI96Kqokziwa5jggZu0zlIJpOqkQWvtiSWrH+8xtXiaRm34Wuiba d85SdUisvk9lpzv5XLVYAd0b+bqu5otP6WpWayXM= Subject: Re: FreeBSD blocks on BOCHS serial port To: Eugene Grosbein , freebsd-stable@freebsd.org References: From: Alexander Lochmann Openpgp: preference=signencrypt Autocrypt: addr=alexander.lochmann@tu-dortmund.de; prefer-encrypt=mutual; keydata= xsFNBFQIyUEBEADZ+x+Ssg/46SiU66zm2lPGYAdqYfmXVv+sf/23+/KSj0FQHZKywzWjsmgR vWZZVlGJolwcW3MJ/g6ctZeOpfYiZVpzbZwNgKU0ETGjUmqmlq5/o5KnENKOimZzaKSaNn9p IC+EIeWXvu7pQjW0w1bK/RVVNw0p1Iz82W4Z+vKtD8CS+YJLAcZ6YoZMvQEg84O9odlV2Ryp oVj9EzHH40TWEdtgd4pQkaOks01PEr19sJXUjnP0VxLfs91AZjRnmGJKnI4HcrOKwquoQEeL DtHCxK0VNeoXCWkz33uBxSL5cicQ7D09hxjWthMilUpDZT94x0K452q4nybQ1TSLTYC8mlW+ xKUvJmqfHZbITJ10dTgjNvOe0kLbpXeQ1789lNmnA9bkQAK5Cefo55WbXmr1Mo3PV7y0XCib OaiijPlZo/Isc03EOK3lHPK8NuY8G+ftvphO4RyXCUWXw/o01cDnPaIEcTWkUbXvMhf/6ltP 1QWEfkguzGVjTw7Xssm9YuokC+P+49JKRyZzyCJZ022OxMlsX6c1BNZ4+cWUNmn6xr1xRNse SglpMLL1m3K1KuLf1hdAor6PBzFLiLa33lUhsWtg1ACFhpfZZOQRVas2McXTYUUpmCzOYI5F +km5q6cZStr9m7O3Y3DDGotiaJDpLtATwZ4MIM4ADbg/xl6ZgwARAQABzS9BbGV4YW5kZXIg TG9jaG1hbm4gPGluZm9AYWxleGFuZGVyLWxvY2htYW5uLmRlPsLBfQQTAQgAJwUCWVOVTgIb IwUJCWYBgAULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAKCRBZPu0FvD72/foqD/9sAlmzATtt wpkcTYTgJcqgfaXI79HYmC6XML7bUAdla30buqsonqXAKN7NT2PNsCxLSyLwk25lkNQz8SgZ ASfh7u//T/0fCuILrR6njh6IYbmlWLO2YU/B5nYx2oT9Bdawp0q858osQV49xvXnVtsQXeE6 fKymk75wNH/XyJRUEV5/edky6nmleNqKlNOGF0f+OswyLtcXSlHV2ZyYGRsS/G1H5tMxtUon tNxgSi217lyKox4IqiBrTDokP6Ka25RGvGjT94WQd23wQBkxT4jG0FY+UiimL0Is9Rjp/arS caWFdZgd5PBO3aVo9Z7E8C0rFqQzhQ2aZtXlKN3jtJxnwRwfNWExOjvjvWG014UaPYH/o1b9 VIEtklFoQ91gQjE7LIryOVLYzHYngU0xaelx9ZkJj6iRWnkwSOLcdF3EqgV16PygfflrlCl8 ze9Yw2nL13Zb0fDHPK3fvCDke3Km5s+6eqN8w1ifimYQgvbnf5hLkVQ/TfTVvLdQcZXpsJz7 G7hH7exxqQdo3rP52KLcIPBL2h4htx+q6zYg0fND/GiVObsZCce4IvJnFa7X8JV8oUg5MaJV +X0suxWiJuFW7k9fYiylpKfJrdcUmVcuoxpEM9T+J7gOj/IIHBS+gqskIcewGhnoR1+rjkoZ dsyXbyPFaAtX+tHtUo55WArXl87BTQRUCMlBARAAnCFuEZ8V7Xh7/x5eP5fdurKMzgi/IsE/ zg/ULy99e9WNTA1/G7fC53jKIeURuEnoLXVWgOIy5Hb/AU5kW2O6ma8yY2CV+D1Mr5rmW6qW vjxdXObqlHLocKV5UALqS9XQoDuadcW3QsRDgfS5vtoVBSctS7L4ncIniXRakZdPWvyMqSra ssCcWurEiafWTzwjzCZycSFcxqgMB1jvOC3yF+SOgUVG6gIcZYyZuNAZO/c/jx3crQ9Emk7l iIbFWERXISi8am16JFISWlrqRNb+MRXtkqrcvb0gqyWTEWUUy754EcWyVRyCSbCuvORzUt0C UqxbapfkhjJDx6V/dvmQpskx+gwEN2NDLYyU3KGCrt3yPCk/QUrC7rl1E6F+2JeEWxQebNK8 GdlzMHiiXZMMqQuX0mZi7RMIIpjEOFXwQVDyQrx4Zrzhyl91pbPfQ+8WFj+y64op5o23bomj vwPmy4wHS6qhiaY0O098/r6sc6dyGnidzm0p55z6aXClQH+qmaruWH3N9avzmJ9fVshiIcCt zLrlZo2rcTJhoJEsc4E0z94xUNNPKspj3IK74DkfjBAgiKV4zjH3pzoYbCp4bhe4cVEv+ibW CrBDBMCV1TedPbDYSYhM0mPavlWJ/SAKx0gTJqYuZel7yNYsDw/R0Tbq7D8SlZX4vJULAu88 bk0AEQEAAcLBZQQYAQIADwUCVAjJQQIbDAUJCWYBgAAKCRBZPu0FvD72/RJJD/9i8hlljqEw BgYc74ComM2q0t1kDWQrhR0nwf114OEkUl9zbMRlWVnS71VYM1qNfrQtUJOsDiFUEksNtMEF 3vG6GfMogfHjOKIX0tJckjvYDpEC2C4o1oNySGME26sitl/C6WwrO3lE1zPTTuqZlbaHNywQ SF0BJV/Iq9AWWdfTgkgqJ05MlR2CuiGxCddT8YyRuWUu2pyOBULdJrs8pGa4ZG5n+SFdw7Sf ylH4UI5yWtgfyqE+xer6UwqMj7WgVB0FxAG9jWmVcBdOll7Kn1+MpXsptyZX8UX2uPgTieBn 9hBXd8GArCG997pWlwS1mvMNwPxXUElvTQTOImJT8UYPuXl5/qGo6ciqjy3rR1kTTDeDUh1U qbviUakZUwztxwp/6XkNDgfyGn9xzdwy2XW47WWONMZdYkfUzIA9n59jJQBct3Uin43ggEGD /XGp9TIHmxO9vTCO0Ibc7lGHR8voiTvxDTZUoBaOQy8EarLBBqlmoNMVj4HJ4lABESE08xyX nr0nmYeU4R8g9e9z8J/rSIUeGyuURcv4J88Kh3JJfB8O6NOpudciOHVFXmrTU5gIja5lt4kJ 73oYy2TmFzl8eKL7Fnb0J9NXVKN4Al3RFkOckCzkERkwnK6tYcwhHf/74svaE7KTa3GSX9aW 6NxCpAsFDwJbauda2prWMzruCg== Message-ID: <661e5d36-6684-fae5-b325-f02ad570f2b4@tu-dortmund.de> Date: Mon, 13 Aug 2018 22:15:29 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="f0thOhpCELH0FtOzDCrS8wBjUSfHCH7xL" X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Aug 2018 20:15:33 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --f0thOhpCELH0FtOzDCrS8wBjUSfHCH7xL Content-Type: multipart/mixed; boundary="ZY8nTSAkxRjtHmIRZuAJc1WBjADAcnVLE"; protected-headers="v1" From: Alexander Lochmann To: Eugene Grosbein , freebsd-stable@freebsd.org Message-ID: <661e5d36-6684-fae5-b325-f02ad570f2b4@tu-dortmund.de> Subject: Re: FreeBSD blocks on BOCHS serial port References: In-Reply-To: --ZY8nTSAkxRjtHmIRZuAJc1WBjADAcnVLE Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 13.08.2018 21:36, Eugene Grosbein wrote: > 13.08.2018 20:52, Alexander Lochmann wrote: >=20 >> Hi folks! >> >> We are doing some automatic experiments using FreeBSD running in a >> virtual machine. >> To control the experiment from the outside, we use serial ports to >> communicate with an userspace program. >> The communication via serial does work with QEMU. However, it does not= >> work with BOCHS which is our desired emulator. >> Even simple operations like 'echo FOO | tee /dev/ttyu1' or 'cat >> /dev/ttyu1' do not work. Both commands block 'forever'. >> It does not matter whether we use ttyu0 (file backend) or ttyu1 (tcp >> socket). >> I put some debug output in sys/dev/uart/uart_dev_ns8250.c. The output >> suggests that the driver more or less reads and writes to the serial >> ports. At least it does something... >> >> Do you have any hints how we can further analyze this problem? >> Did anyone came across a similar problem? >=20 > This could be modem control line "Carrier Detection" (CD) or flow contr= ol problem: > emulators can have distinct default settings for serial ports. >=20 > You should not rely on defaults and make sure you disable modem control= /CD > either explicitly (using stty(1) etc.) or implicitly by switching to /d= ev/cuau0 > instead of /dev/ttyu0. Flow control settings should match too, for both= sides > of virtual port. Thx. I cannot even run 'stty < /dev/ttyu1' to see the current settings. It simply blocks... 'stty < /dev/ttyu0' works perfectly. ttyu0 uses a file-based backend. Whereas ttyu1 uses a tcp server-based backend with a connected netcat. >=20 >=20 --=20 Technische Universit=C3=A4t Dortmund Alexander Lochmann PGP key: 0xBC3EF6FD Otto-Hahn-Str. 16 phone: +49.231.7556141 D-44227 Dortmund fax: +49.231.7556116 http://ess.cs.tu-dortmund.de/Staff/al --ZY8nTSAkxRjtHmIRZuAJc1WBjADAcnVLE-- --f0thOhpCELH0FtOzDCrS8wBjUSfHCH7xL Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEElhZsUHzVP0dbkjCRWT7tBbw+9v0FAltx5uIACgkQWT7tBbw+ 9v1zng//Wxrt7QjZEqbyvyhiDjBCD2bSu9QZI/fuHzNC6ts/6foPiTsHg9DIORDF wQfbZlqKI14Mb50/qnie9p8SmB1bCs40eXE7vresM7awzzK9hf0CeRVO1JMSfnHL We8GC39cAnG2lpsLJqvL3V+hfMD7Ev2PJ4LavrAC7h1mdnBHrHr3ApwvxcqXtmtH wrI8XcYnbL0rdqoMRtgGOXvNDGxZUzrUQUFMR16Dyojsfx/VMJwXCnnW6R+E+8sG 0haLfLS4XtxFlPcNHlFOP9xY73bl6ThWLiN5AVL+ExeGyj8AZHYW/l+M21LvgOer xBRRIO/JAUaB6rSEQPUTKSAD0nBEy3H7Ib/XKdnx55HaGL4eCM+xy/HpxOI8LWgu HPouz0/goEpCcydI5mg3ucEkkmqFFje3vKShPMSlbad/zlgOyexRNgq376m4GmDV BUxJbXZe5ZJltSuKfsMPmMT9PBIfrXf7SRm2/WQLr13BwKRRTsdburxaIJm31fqf IsS2vlsh4JsVXhd5XP0QBXz3cHdrKdMmfJ5TozE4Lj7Phwxemdkh7yJeFB3VKeHS QjZwgxXL7uMfsyNal+LEQ4h2spaKwg7SSiuCl03MQ0MLETcKZqCvFRGzret5StAi 6GjVxj9VXHBUNsN+7skuw0ZFEYxZWghJ5GogRfaTVX94TDNBgxM= =uqRA -----END PGP SIGNATURE----- --f0thOhpCELH0FtOzDCrS8wBjUSfHCH7xL--