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2048-bit rsa key) header.d=1e100.net header.i=@1e100.net header.b=WN9ReoiW; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=gmail.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751534AbeAaDDg (ORCPT ); Tue, 30 Jan 2018 22:03:36 -0500 Received: from mail-qt0-f195.google.com ([209.85.216.195]:38850 "EHLO mail-qt0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751404AbeAaDDe (ORCPT ); Tue, 30 Jan 2018 22:03:34 -0500 X-Google-Smtp-Source: AH8x224OJa5J3ZsT8vXS5T1d562nboUzwuIV8UXDuvU+UTuNFqIv5+++p4xRfLEyphH3KQ1umx3FEA== From: Florian Fainelli Subject: Re: [patch v18 0/4] JTAG driver introduction To: Oleksandr Shamray , gregkh@linuxfoundation.org, arnd@arndb.de Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, openbmc@lists.ozlabs.org, joel@jms.id.au, jiri@resnulli.us, tklauser@distanz.ch, linux-serial@vger.kernel.org, vadimp@mellanox.com, system-sw-low-level@mellanox.com, robh+dt@kernel.org, openocd-devel-owner@lists.sourceforge.net, linux-api@vger.kernel.org, davem@davemloft.net, mchehab@kernel.org References: <1517236305-4880-1-git-send-email-oleksandrs@mellanox.com> Message-ID: Date: Tue, 30 Jan 2018 19:03:29 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <1517236305-4880-1-git-send-email-oleksandrs@mellanox.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 01/29/2018 06:31 AM, Oleksandr Shamray wrote: > When a need raise up to use JTAG interface for system's devices > programming or CPU debugging, usually the user layer > application implements jtag protocol by bit-bang or using a > proprietary connection to vendor hardware. > This method can be slow and not generic. > > We propose to implement general JTAG interface and infrastructure > to communicate with user layer application. In such way, we can > have the standard JTAG interface core part and separation from > specific HW implementation. > This allow new capability to debug the CPU or program system's > device via BMC without additional devices nor cost. Oleksandr, you have completed dodged my questions here: https://lkml.org/lkml/2017/12/25/163 can you try to respond to some of these questions please? -- Florian