[{"id":1776876,"web_url":"http://patchwork.ozlabs.org/comment/1776876/","msgid":"","list_archive_url":null,"date":"2017-09-28T08:33:18","subject":"Re: [patch v9 0/4] JTAG driver introduction","submitter":{"id":703,"url":"http://patchwork.ozlabs.org/api/people/703/","name":"Geert Uytterhoeven","email":"geert@linux-m68k.org"},"content":"Hi Oleksandr,\n\n[My attention was drawn by https://lwn.net/Articles/734440/]\n[CC linux-spi, which was never included, while linux-serial was]\n\nOn Thu, Sep 21, 2017 at 11:25 AM, Oleksandr Shamray\n wrote:\n> When a need raise up to use JTAG interface for system's devices\n> programming or CPU debugging, usually the user layer\n> application implements jtag protocol by bit-bang or using a\n> proprietary connection to vendor hardware.\n> This method can be slow and not generic.\n>\n> We propose to implement general JTAG interface and infrastructure\n> to communicate with user layer application. In such way, we can\n> have the standard JTAG interface core part and separation from\n> specific HW implementation.\n> This allow new capability to debug the CPU or program system's\n> device via BMC without additional devices nor cost.\n>\n> This patch purpose is to add JTAG master core infrastructure by\n> defining new JTAG class and provide generic JTAG interface\n> to allow hardware specific drivers to connect this interface.\n> This will enable all JTAG drivers to use the common interface\n> part and will have separate for hardware implementation.\n>\n> The JTAG (Joint Test Action Group) core driver provides minimal generic\n> JTAG interface, which can be used by hardware specific JTAG master\n> controllers. By providing common interface for the JTAG controllers,\n> user space device programing is hardware independent.\n>\n> Modern SoC which in use for embedded system' equipped with\n> internal JTAG master interface.\n> This interface is used for programming and debugging system's\n> hardware components, like CPLD, FPGA, CPU, voltage and\n> industrial controllers.\n> Firmware for such devices can be upgraded through JTAG interface during\n> Runtime. The JTAG standard support for multiple devices programming,\n> is in case their lines are daisy-chained together.\n>\n> For example, systems which equipped with host CPU, BMC SoC or/and\n> number of programmable devices are capable to connect a pin and\n> select system components dynamically for programming and debugging,\n> This is using by the BMC which is equipped with internal SoC master\n> controller.\n> For example:\n>\n> BMC JTAG master --> pin selected to CPLDs chain for programming (filed\n> upgrade, production)\n> BMC JTAG master --> pin selected to voltage monitors for programming\n> (field upgrade, production)\n> BMC JTAG master --> pin selected to host CPU (on-site debugging\n> and developers debugging)\n>\n> For example, we can have application in user space which using calls\n> to JTAG driver executes CPLD programming directly from SVF file\n>\n> The JTAG standard (IEEE 1149.1) defines the next connector pins:\n> - TDI (Test Data In);\n> - TDO (Test Data Out);\n> - TCK (Test Clock);\n> - TMS (Test Mode Select);\n> - TRST (Test Reset) (Optional);\n>\n> The SoC equipped with JTAG master controller, performs\n> device programming on command or vector level. For example\n> a file in a standard SVF (Serial Vector Format) that contains\n> boundary scan vectors, can be used by sending each vector\n> to the JTAG interface and the JTAG controller will execute\n> the programming.\n>\n> Initial version provides the system calls set for:\n> - SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);\n> - SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);\n> - RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified\n> number of clocks.\n>\n> SoC which are not equipped with JTAG master interface, can be built\n> on top of JTAG core driver infrastructure, by applying bit-banging of\n> TDI, TDO, TCK and TMS pins within the hardware specific driver.\n\nOr by using an SPI master?\n\nGr{oetje,eeting}s,\n\n Geert\n\n--\nGeert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org\n\nIn personal conversations with technical people, I call myself a hacker. But\nwhen I'm talking to journalists I just say \"programmer\" or something like that.\n -- Linus Torvalds","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","openbmc@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","openbmc@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2pHf0Vfbz9t2Q\n\tfor ;\n\tThu, 28 Sep 2017 18:48:14 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3y2pHd1prbzDsQ5\n\tfor ;\n\tThu, 28 Sep 2017 18:48:13 +1000 (AEST)","from mail-wm0-x244.google.com (mail-wm0-x244.google.com\n\t[IPv6:2a00:1450:400c:c09::244])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3y2nyV49LvzDsPp\n\tfor ; Thu, 28 Sep 2017 18:33:21 +1000 (AEST)","by mail-wm0-x244.google.com with SMTP id u138so616295wmu.4\n\tfor ; Thu, 28 Sep 2017 01:33:21 -0700 (PDT)","by 10.223.129.226 with HTTP; Thu, 28 Sep 2017 01:33:18 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"X8N9zfEz\"; dkim-atps=neutral","lists.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"X8N9zfEz\"; dkim-atps=neutral","ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gmail.com\n\t(client-ip=2a00:1450:400c:c09::244; helo=mail-wm0-x244.google.com;\n\tenvelope-from=geert.uytterhoeven@gmail.com; receiver=)","lists.ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"X8N9zfEz\"; dkim-atps=neutral"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;\n\th=mime-version:sender:in-reply-to:references:from:date:message-id\n\t:subject:to:cc;\n\tbh=FJL9dm/7ZlsaQE893hGebXwGqiac4C2PcNh9ircWQ8Q=;\n\tb=X8N9zfEzucoeiJT9aT6Jdm1AKp/2v/1f8MMmQSzWCdtRSr87LGrfF4u6yfFUZBDPbh\n\t2+fgmxW1oNUBHEmylXINrnbSYMeo5pD1Bs1ZKNaIilJKlTC81lr/Hlum4Eel5TYzp8uE\n\tLXmVOQkWFGEmDm6RkMr7jAfWulivayrONt/ARnk16v5dT189D8v9kL7LTJKXltgV7WUs\n\tdD9vjpQpFlrVaZhWeof+7zlqhXrvWZcYgiYlNUwiqJPKy/HmCgGPi9OYkphm+tvWgjx/\n\tfM4b91e0ZUN2oHM2adV7vQewJ5FTJzkku4gTENnhXRPE8mb78/4Ciru/b8isan1frQpr\n\tcTAQ==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:mime-version:sender:in-reply-to:references:from\n\t:date:message-id:subject:to:cc;\n\tbh=FJL9dm/7ZlsaQE893hGebXwGqiac4C2PcNh9ircWQ8Q=;\n\tb=b9rYVHM7M/6DtBgS3ZM0Kacf5yUayKwF2e0f+qVymWfgpeoF7w3bJ16qbS25oYToD2\n\tzt3YdDzhFVL587ye+UDlkxzWQK7cdCpJvxW25c7tpo56CpjUIo9vW0eUYaHaFg5Zre/4\n\tLeQcYIl76RkFTdbWtROCfXVm8P9rLmWYaDBpzlBt+6LXu2ljgk6LQ658HjuLGvTZI41e\n\t9FfmQRpye0gL6M0dnP9dTi9DiR69+58nKbjoImmDYQPAYiDASwS3uTpalo0Oy+T+SIfc\n\t5ZbSyN0t0rvTzS+jDrGYdfsutG2tPHs34ayV5QbIadwTJitBkb+AYx+mSvjmxCAP+cWb\n\ttqAw==","X-Gm-Message-State":"AHPjjUgzGEXJCpmaQapN1wNuQqE0frcg2edIJB1mdqBnMwiQmMIx7D48\n\tS8sklLdduJVnFHsh9ZgrWjSv5sdTFtlsZuKTkME=","X-Google-Smtp-Source":"AOwi7QDbfPUN4h0CanHxpn5JAospxR2VGMF9nOelwXbcDVr20BjteBp50x7wGAKon9NoeJFWWRYEWNvLVNyxXhC0Uu8=","X-Received":"by 10.28.36.212 with SMTP id k203mr260094wmk.127.1506587598760; \n\tThu, 28 Sep 2017 01:33:18 -0700 (PDT)","MIME-Version":"1.0","In-Reply-To":"<1505985932-27568-1-git-send-email-oleksandrs@mellanox.com>","References":"<1505985932-27568-1-git-send-email-oleksandrs@mellanox.com>","From":"Geert Uytterhoeven ","Date":"Thu, 28 Sep 2017 10:33:18 +0200","X-Google-Sender-Auth":"ErALBLwzm6Pxb4jxp6dk4SBrX4o","Message-ID":"","Subject":"Re: [patch v9 0/4] JTAG driver introduction","To":"Oleksandr Shamray ","Content-Type":"text/plain; charset=\"UTF-8\"","X-Mailman-Approved-At":"Thu, 28 Sep 2017 18:48:06 +1000","X-BeenThere":"openbmc@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Development list for OpenBMC ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"system-sw-low-level@mellanox.com,\n\t\"devicetree@vger.kernel.org\" ,\n\tJiri Pirko , Arnd Bergmann ,\n\tVadim Pasternak ,\n\tGreg KH , openbmc@lists.ozlabs.org,\n\t\"linux-kernel@vger.kernel.org\" ,\n\topenocd-devel-owner@lists.sourceforge.net,\n\tlinux-spi , mec@shout.net,\n\tRob Herring , Mark Brown ,\n\t\"linux-serial@vger.kernel.org\" ,\n\t\"linux-api@vger.kernel.org\" ,\n\tTobias Klauser ,\n\tMauro Carvalho Chehab ,\n\t\"David S. Miller\" ,\n\t\"linux-arm-kernel@lists.infradead.org\"\n\t","Errors-To":"openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org","Sender":"\"openbmc\"\n\t"}},{"id":1776883,"web_url":"http://patchwork.ozlabs.org/comment/1776883/","msgid":"","list_archive_url":null,"date":"2017-09-28T08:53:12","subject":"RE: [patch v9 0/4] JTAG driver introduction","submitter":{"id":72099,"url":"http://patchwork.ozlabs.org/api/people/72099/","name":"Oleksandr Shamray","email":"oleksandrs@mellanox.com"},"content":"> -----Original Message-----\r\n> From: geert.uytterhoeven@gmail.com [mailto:geert.uytterhoeven@gmail.com]\r\n> On Behalf Of Geert Uytterhoeven\r\n> Sent: Thursday, September 28, 2017 11:33 AM\r\n> To: Oleksandr Shamray \r\n> Cc: Greg KH ; Arnd Bergmann\r\n> ; linux-kernel@vger.kernel.org; linux-arm-\r\n> kernel@lists.infradead.org; devicetree@vger.kernel.org;\r\n> openbmc@lists.ozlabs.org; Joel Stanley ; Jiri Pirko\r\n> ; Tobias Klauser ; linux-\r\n> serial@vger.kernel.org; mec@shout.net; Vadim Pasternak\r\n> ; system-sw-low-level level@mellanox.com>; Rob Herring ; openocd-devel-\r\n> owner@lists.sourceforge.net; linux-api@vger.kernel.org; David S. Miller\r\n> ; Mauro Carvalho Chehab ;\r\n> linux-spi ; Mark Brown \r\n> Subject: Re: [patch v9 0/4] JTAG driver introduction\r\n> \r\n> Hi Oleksandr,\r\n> \r\n> [My attention was drawn by\r\n> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flwn.net\r\n> %2FArticles%2F734440%2F&data=02%7C01%7Coleksandrs%40mellanox.com%7\r\n> C97b8ba88686a42daaace08d5064b92eb%7Ca652971c7d2e4d9ba6a4d149256f\r\n> 461b%7C0%7C0%7C636421844026854216&sdata=TeHD4a3%2FBN6a5XG3Jizf5\r\n> pmsyJHJjzkEzkpnqsXC6S0%3D&reserved=0]\r\n> [CC linux-spi, which was never included, while linux-serial was]\r\n> \r\n> On Thu, Sep 21, 2017 at 11:25 AM, Oleksandr Shamray\r\n> wrote:\r\n> > When a need raise up to use JTAG interface for system's devices\r\n> > programming or CPU debugging, usually the user layer application\r\n> > implements jtag protocol by bit-bang or using a proprietary connection\r\n> > to vendor hardware.\r\n> > This method can be slow and not generic.\r\n> >\r\n\r\n\r\n[..]\r\n\r\n> >\r\n> > Initial version provides the system calls set for:\r\n> > - SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);\r\n> > - SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);\r\n> > - RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified\r\n> > number of clocks.\r\n> >\r\n> > SoC which are not equipped with JTAG master interface, can be built on\r\n> > top of JTAG core driver infrastructure, by applying bit-banging of\r\n> > TDI, TDO, TCK and TMS pins within the hardware specific driver.\r\n> \r\n> Or by using an SPI master?\r\n> \r\n\r\nI think it depends on how flexible the SPI interface is. If you can set it to transfer \r\nfrom 1 to n bits at a time, and you control the TMS line in software, you should \r\nbe able to use it. If the SPI interface can only transfer a multiple of 8 bits \r\nat a time, then in general it would not be suitable for JTAG.\r\n\r\n> Gr{oetje,eeting}s,\r\n> \r\n> Geert\r\n> \r\n> --\r\n> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-\r\n> m68k.org\r\n> \r\n> In personal conversations with technical people, I call myself a hacker. But\r\n> when I'm talking to journalists I just say \"programmer\" or something like that.\r\n> -- Linus Torvalds","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","openbmc@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","openbmc@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2pQ21LnWz9t2Q\n\tfor ;\n\tThu, 28 Sep 2017 18:53:46 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3y2pQ171rpzDsQ6\n\tfor ;\n\tThu, 28 Sep 2017 18:53:45 +1000 (AEST)","from EUR02-HE1-obe.outbound.protection.outlook.com\n\t(mail-eopbgr10086.outbound.protection.outlook.com [40.107.1.86])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3y2pPb0H74zDsPp\n\tfor ; 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\n\tenvelope-from=oleksandrs@mellanox.com; receiver=)","lists.ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=Mellanox.com header.i=@Mellanox.com\n\theader.b=\"YhB68n3o\"; dkim-atps=neutral","spf=none (sender IP is )\n\tsmtp.mailfrom=oleksandrs@mellanox.com; "],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com;\n\ts=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version;\n\tbh=ZSzKvaLqOB+8JYL84xiGjioh1+Ge986pOVACqDcoF7A=;\n\tb=YhB68n3oRQmGg9w303lbAsZU7We49vO7GEDff5oF+YcfIRCjA8P7wZNfmSoffUVNHVfPrF6PoClrOTIfrv5ilez84C/1+QRGcWk1UCFiNgq+tJqWObEG/HLeXSBv8bgYpoY3UVk+4Xg08JW+NCkrjGbcfi9LmzY82oeW197SEXk=","From":"Oleksandr Shamray ","To":"Geert Uytterhoeven ","Subject":"RE: [patch v9 0/4] JTAG driver introduction","Thread-Topic":"[patch v9 0/4] JTAG driver introduction","Thread-Index":"AQHTMru4M5azt7XbqEuLkdSxxS/sN6LKA2cAgAAE/MA=","Date":"Thu, 28 Sep 2017 08:53:12 +0000","Message-ID":"","References":"<1505985932-27568-1-git-send-email-oleksandrs@mellanox.com>\n\t","In-Reply-To":"","Accept-Language":"en-US, uk-UA","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","authentication-results":["ozlabs.org; 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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","MIME-Version":"1.0","X-OriginatorOrg":"Mellanox.com","X-MS-Exchange-CrossTenant-originalarrivaltime":"28 Sep 2017 08:53:12.4284\n\t(UTC)","X-MS-Exchange-CrossTenant-fromentityheader":"Hosted","X-MS-Exchange-CrossTenant-id":"a652971c-7d2e-4d9b-a6a4-d149256f461b","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"HE1PR05MB3339","X-BeenThere":"openbmc@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Development list for OpenBMC ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"system-sw-low-level ,\n\t\"devicetree@vger.kernel.org\" ,\n\tJiri Pirko , Arnd Bergmann ,\n\tVadim Pasternak ,\n\tGreg KH , \n\t\"openbmc@lists.ozlabs.org\" ,\n\t\"linux-kernel@vger.kernel.org\" ,\n\t\"openocd-devel-owner@lists.sourceforge.net\"\n\t,\n\tlinux-spi , \"mec@shout.net\" ,\n\tRob Herring , Mark Brown ,\n\t\"linux-serial@vger.kernel.org\" ,\n\t\"linux-api@vger.kernel.org\" ,\n\tTobias Klauser , Mauro\n\tCarvalho Chehab ,\n\t\"David S. Miller\" , \n\t\"linux-arm-kernel@lists.infradead.org\"\n\t","Errors-To":"openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org","Sender":"\"openbmc\"\n\t"}},{"id":1776890,"web_url":"http://patchwork.ozlabs.org/comment/1776890/","msgid":"","list_archive_url":null,"date":"2017-09-28T09:02:10","subject":"Re: [patch v9 0/4] JTAG driver introduction","submitter":{"id":703,"url":"http://patchwork.ozlabs.org/api/people/703/","name":"Geert Uytterhoeven","email":"geert@linux-m68k.org"},"content":"Hi Oleksandr,\n\nOn Thu, Sep 28, 2017 at 10:53 AM, Oleksandr Shamray\n wrote:\n>> [My attention was drawn by\n>> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flwn.net\n>> %2FArticles%2F734440%2F&data=02%7C01%7Coleksandrs%40mellanox.com%7\n>> C97b8ba88686a42daaace08d5064b92eb%7Ca652971c7d2e4d9ba6a4d149256f\n>> 461b%7C0%7C0%7C636421844026854216&sdata=TeHD4a3%2FBN6a5XG3Jizf5\n>> pmsyJHJjzkEzkpnqsXC6S0%3D&reserved=0]\n>> [CC linux-spi, which was never included, while linux-serial was]\n>>\n>> On Thu, Sep 21, 2017 at 11:25 AM, Oleksandr Shamray\n>> wrote:\n>> > When a need raise up to use JTAG interface for system's devices\n>> > programming or CPU debugging, usually the user layer application\n>> > implements jtag protocol by bit-bang or using a proprietary connection\n>> > to vendor hardware.\n>> > This method can be slow and not generic.\n>> >\n>\n>\n> [..]\n>\n>> >\n>> > Initial version provides the system calls set for:\n>> > - SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);\n>> > - SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);\n>> > - RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified\n>> > number of clocks.\n>> >\n>> > SoC which are not equipped with JTAG master interface, can be built on\n>> > top of JTAG core driver infrastructure, by applying bit-banging of\n>> > TDI, TDO, TCK and TMS pins within the hardware specific driver.\n>>\n>> Or by using an SPI master?\n>>\n>\n> I think it depends on how flexible the SPI interface is. If you can set it to transfer\n> from 1 to n bits at a time, and you control the TMS line in software, you should\n> be able to use it. If the SPI interface can only transfer a multiple of 8 bits\n> at a time, then in general it would not be suitable for JTAG.\n\nSure, that depends on the actual SPI master interface.\nBut I guess you can write a generic JTAG-over-SPI driver, and use a tms-gpios\nproperty in DT to specify how to control TMS.\n\nGr{oetje,eeting}s,\n\n Geert\n\n--\nGeert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org\n\nIn personal conversations with technical people, I call myself a hacker. But\nwhen I'm talking to journalists I just say \"programmer\" or something like that.\n -- Linus Torvalds","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","openbmc@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","openbmc@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2pcC032Vz9t2l\n\tfor ;\n\tThu, 28 Sep 2017 19:02:35 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3y2pcB1frpzDsPp\n\tfor ;\n\tThu, 28 Sep 2017 19:02:34 +1000 (AEST)","from mail-wm0-x242.google.com (mail-wm0-x242.google.com\n\t[IPv6:2a00:1450:400c:c09::242])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3y2pbp6Z0wzDsPp\n\tfor ; Thu, 28 Sep 2017 19:02:14 +1000 (AEST)","by mail-wm0-x242.google.com with SMTP id m127so788697wmm.3\n\tfor ; Thu, 28 Sep 2017 02:02:13 -0700 (PDT)","by 10.223.129.226 with HTTP; Thu, 28 Sep 2017 02:02:10 -0700 (PDT)"],"Authentication-Results":["ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"FV2jeYPi\"; dkim-atps=neutral","lists.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"FV2jeYPi\"; dkim-atps=neutral","ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gmail.com\n\t(client-ip=2a00:1450:400c:c09::242; helo=mail-wm0-x242.google.com;\n\tenvelope-from=geert.uytterhoeven@gmail.com; receiver=)","lists.ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"FV2jeYPi\"; dkim-atps=neutral"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;\n\th=mime-version:sender:in-reply-to:references:from:date:message-id\n\t:subject:to:cc;\n\tbh=B8OHUWY4g6nbqeNhcZNkWYkQiSc3AHzgIHIMyPyG6to=;\n\tb=FV2jeYPizZAIGwZynPVykmTDWB7/TkZdTf5MK9bZBw6AckuhoWpitCCjVe4iNAmHbQ\n\t1IErqwjvtwnSmDJN9vNG0zP6haCbqj3XoTTllboN1MGCQAe62PnUmvZHAe7ILfqsDW3E\n\tlXUaHHoWUQS7VEea4o7AAhB4BB8er0nFi2eaL/+hfatZoSxk+ZKHcJ/nEDKEPpXmrnfZ\n\tMkfeLArpcD4tHa2A/zbgxBlVlq0QdsQ74NsYlVLdCTDGb2LjcM9oWtDvbCE9Jv69jI2+\n\tG3xH6LgANEV7j6Ig/zny6eGVj7gc+1kwqjDI8PjV3cMybw/0aUHYssACM6hpWcUO4KHw\n\tX5Ig==","X-Google-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:mime-version:sender:in-reply-to:references:from\n\t:date:message-id:subject:to:cc;\n\tbh=B8OHUWY4g6nbqeNhcZNkWYkQiSc3AHzgIHIMyPyG6to=;\n\tb=BuPoyfn3rfUZG9RVZACduvtMICgpGt82TRVkLeZkBERrg/rIABnkCGdukqeFFZvTwb\n\twlZfPK0Bti/3fQD1nsd/X1Jt33pvHH66PApot+6d53CfGujTtbVWTgiUZnY4x1dTO2ao\n\t0kSQjUuI3w5HaY8ptgeGb2uEvaJUzuL+XOGGuQtd5mVxP4NSBq2Vc1h+bu+RR7m2fzFW\n\tfXrUc25xT9ELNvVVE7YKqJd9gWP/wh6N1akO57s9lMv3FYLuGLDt5m9fQZmHCWq74IUx\n\tXbJtktNrozL2mM1qDCl9MHJylbGHiIgFjv8JQY3U7iaMmssB9tU3rKS97CG9ZCk0I/zt\n\tLcYw==","X-Gm-Message-State":"AHPjjUi8W8R43uWpG7zQgGNR9ZTnKZo78PE7bfsYA3YyAOShPjVZVNa4\n\t29PCfIrtUNFPTKX6X8oHVMFJgLW4/aFfcozloco=","X-Google-Smtp-Source":"AOwi7QABqUCPPd4e9SYSYljs3C62h4SmYVMqoXc6U86sfd7wiHmnNS1NiPlDSCQPLDGDDfFE5cVKdzUO+gnuEm7FGwA=","X-Received":"by 10.28.71.25 with SMTP id u25mr373899wma.22.1506589331224; Thu,\n\t28 Sep 2017 02:02:11 -0700 (PDT)","MIME-Version":"1.0","In-Reply-To":"","References":"<1505985932-27568-1-git-send-email-oleksandrs@mellanox.com>\n\t\n\t","From":"Geert Uytterhoeven ","Date":"Thu, 28 Sep 2017 11:02:10 +0200","X-Google-Sender-Auth":"yqjJszmxOFubJPBq44r3ySY7E7Y","Message-ID":"","Subject":"Re: [patch v9 0/4] JTAG driver introduction","To":"Oleksandr Shamray ","Content-Type":"text/plain; charset=\"UTF-8\"","X-BeenThere":"openbmc@lists.ozlabs.org","X-Mailman-Version":"2.1.24","Precedence":"list","List-Id":"Development list for OpenBMC ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"system-sw-low-level ,\n\t\"devicetree@vger.kernel.org\" ,\n\tJiri Pirko , Arnd Bergmann ,\n\tVadim Pasternak ,\n\tGreg KH , \n\t\"openbmc@lists.ozlabs.org\" ,\n\t\"linux-kernel@vger.kernel.org\" ,\n\t\"openocd-devel-owner@lists.sourceforge.net\"\n\t,\n\tlinux-spi , \"mec@shout.net\" ,\n\tRob Herring , Mark Brown ,\n\t\"linux-serial@vger.kernel.org\" ,\n\t\"linux-api@vger.kernel.org\" ,\n\tTobias Klauser ,\n\tMauro Carvalho Chehab ,\n\t\"David S. Miller\" ,\n\t\"linux-arm-kernel@lists.infradead.org\"\n\t","Errors-To":"openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org","Sender":"\"openbmc\"\n\t"}},{"id":1776965,"web_url":"http://patchwork.ozlabs.org/comment/1776965/","msgid":"","list_archive_url":null,"date":"2017-09-28T11:11:42","subject":"RE: [patch v9 0/4] JTAG driver introduction","submitter":{"id":72099,"url":"http://patchwork.ozlabs.org/api/people/72099/","name":"Oleksandr Shamray","email":"oleksandrs@mellanox.com"},"content":"> -----Original Message-----\r\n> From: geert.uytterhoeven@gmail.com [mailto:geert.uytterhoeven@gmail.com]\r\n> On Behalf Of Geert Uytterhoeven\r\n> Sent: Thursday, September 28, 2017 12:02 PM\r\n> To: Oleksandr Shamray \r\n> Cc: Greg KH ; Arnd Bergmann\r\n> ; linux-kernel@vger.kernel.org; linux-arm-\r\n> kernel@lists.infradead.org; devicetree@vger.kernel.org;\r\n> openbmc@lists.ozlabs.org; Joel Stanley ; Jiri Pirko\r\n> ; Tobias Klauser ; linux-\r\n> serial@vger.kernel.org; mec@shout.net; Vadim Pasternak\r\n> ; system-sw-low-level level@mellanox.com>; Rob Herring ; openocd-devel-\r\n> owner@lists.sourceforge.net; linux-api@vger.kernel.org; David S. Miller\r\n> ; Mauro Carvalho Chehab ;\r\n> linux-spi ; Mark Brown \r\n> Subject: Re: [patch v9 0/4] JTAG driver introduction\r\n> \r\n> Hi Oleksandr,\r\n> \r\n> On Thu, Sep 28, 2017 at 10:53 AM, Oleksandr Shamray\r\n> wrote:\r\n> >> [My attention was drawn by\r\n> >> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flw\r\n> >> n.net\r\n> >>\r\n> %2FArticles%2F734440%2F&data=02%7C01%7Coleksandrs%40mellanox.com%7\r\n> >>\r\n> C97b8ba88686a42daaace08d5064b92eb%7Ca652971c7d2e4d9ba6a4d149256f\r\n> >>\r\n> 461b%7C0%7C0%7C636421844026854216&sdata=TeHD4a3%2FBN6a5XG3Jizf5\r\n> >> pmsyJHJjzkEzkpnqsXC6S0%3D&reserved=0]\r\n> >> [CC linux-spi, which was never included, while linux-serial was]\r\n> >>\r\n> >> On Thu, Sep 21, 2017 at 11:25 AM, Oleksandr Shamray\r\n> >> wrote:\r\n> >> > When a need raise up to use JTAG interface for system's devices\r\n> >> > programming or CPU debugging, usually the user layer application\r\n> >> > implements jtag protocol by bit-bang or using a proprietary\r\n> >> > connection to vendor hardware.\r\n> >> > This method can be slow and not generic.\r\n> >> >\r\n> >\r\n> >\r\n> > [..]\r\n> >\r\n> >> >\r\n> >> > Initial version provides the system calls set for:\r\n> >> > - SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan);\r\n> >> > - SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan);\r\n> >> > - RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified\r\n> >> > number of clocks.\r\n> >> >\r\n> >> > SoC which are not equipped with JTAG master interface, can be built\r\n> >> > on top of JTAG core driver infrastructure, by applying bit-banging\r\n> >> > of TDI, TDO, TCK and TMS pins within the hardware specific driver.\r\n> >>\r\n> >> Or by using an SPI master?\r\n> >>\r\n> >\r\n> > I think it depends on how flexible the SPI interface is. If you can\r\n> > set it to transfer from 1 to n bits at a time, and you control the TMS\r\n> > line in software, you should be able to use it. If the SPI interface\r\n> > can only transfer a multiple of 8 bits at a time, then in general it would not be\r\n> suitable for JTAG.\r\n> \r\n> Sure, that depends on the actual SPI master interface.\r\n> But I guess you can write a generic JTAG-over-SPI driver, and use a tms-gpios\r\n> property in DT to specify how to control TMS.\r\n> \r\n\r\nYes, this is a good idea for SoC which are not equipped with JTAG hardware.\r\n\r\n> Gr{oetje,eeting}s,\r\n> \r\n> Geert\r\n> \r\n> --\r\n> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-\r\n> m68k.org\r\n> \r\n> In personal conversations with technical people, I call myself a hacker. But\r\n> when I'm talking to journalists I just say \"programmer\" or something like that.\r\n> -- Linus Torvalds","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","openbmc@lists.ozlabs.org"],"Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","openbmc@lists.ozlabs.org"],"Received":["from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2sTh3L64z9tXw\n\tfor ;\n\tThu, 28 Sep 2017 21:12:08 +1000 (AEST)","from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3y2sTg2D5ZzDsQ6\n\tfor ;\n\tThu, 28 Sep 2017 21:12:07 +1000 (AEST)","from EUR01-VE1-obe.outbound.protection.outlook.com\n\t(mail-ve1eur01on0086.outbound.protection.outlook.com [104.47.1.86])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3y2sTP4ZBFzDsPp\n\tfor ; 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