From owner-freebsd-questions@freebsd.org Tue Feb 11 14:09:26 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 74B15236174 for ; Tue, 11 Feb 2020 14:09:26 +0000 (UTC) (envelope-from ml@netfence.it) Received: from soth.netfence.it (net-2-44-121-52.cust.vodafonedsl.it [2.44.121.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "mailserver.netfence.it", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 48H4QY2r9Kz43X7 for ; Tue, 11 Feb 2020 14:09:24 +0000 (UTC) (envelope-from ml@netfence.it) Received: from alamar.ventu (alamar.local.netfence.it [10.1.2.18]) (authenticated bits=0) by soth.netfence.it (8.15.2/8.15.2) with ESMTPSA id 01BE9Dm6081475 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO) for ; Tue, 11 Feb 2020 15:09:16 +0100 (CET) (envelope-from ml@netfence.it) X-Authentication-Warning: soth.netfence.it: Host alamar.local.netfence.it [10.1.2.18] claimed to be alamar.ventu From: Andrea Venturoli Subject: Cannot get remote GDB to work To: freebsd-questions@freebsd.org Message-ID: <50a10abf-4873-2acc-4f8b-efb9bddb1194@netfence.it> Date: Tue, 11 Feb 2020 15:09:13 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48H4QY2r9Kz43X7 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=pass (policy=none) header.from=netfence.it; spf=pass (mx1.freebsd.org: domain of ml@netfence.it designates 2.44.121.52 as permitted sender) smtp.mailfrom=ml@netfence.it X-Spamd-Result: default: False [-4.34 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:2.44.121.52]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; HAS_XAW(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_NONE(0.00)[]; DMARC_POLICY_ALLOW(-0.50)[netfence.it,none]; IP_SCORE(-1.54)[ip: (-7.74), ipnet: 2.44.0.0/16(-3.87), asn: 30722(3.86), country: IT(0.03)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:30722, ipnet:2.44.0.0/16, country:IT]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Feb 2020 14:09:26 -0000 Hello. I'm trying to debug through a serial cable, as described in: > https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-online-gdb.html I followed the instruction (I believe correctly), but when I issue "target remote /dev/cuau0", I get: > Remote debugging using /dev/cuau0 > Ignoring packet error, continuing... > warning: unrecognized item "timeout" in "qSupported" response > Ignoring packet error, continuing... > Remote replied unexpectedly to 'vMustReplyEmpty': timeout I tried launching "cu -l /dev/cuau0" on both sides: I can correctly see what I type in the debugging terminal appear on the host's screen, but not vice versa. This starts working again, when I remove flags 0x80 from hint.uart.0.flags and change it back to 0x10 (default). Any hint? bye & Thanks av. P.S. Both machines are physical (no virtualization here), both are 12.1/amd64 and both serial ports are dumb old style serial ports.