From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Tue, 07 Jan 2025 15:36:41 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tVAhE-000LkU-2q for lore@lore.pengutronix.de; Tue, 07 Jan 2025 15:36:41 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tVAhA-0007JP-SD for lore@pengutronix.de; Tue, 07 Jan 2025 15:36:41 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=NbmLFDaQkmE9kK2DlLMI/JougyExhUp0eLTvyrU3RwE=; b=Q9xg4BSYkqq9ILgYMaKYf0ov98 GDgC96j2n0aFFH/eacW0yEzFPa7thmEr0uFUXIOevJV0nh6sGqhh0q+GIWgCjnJfuMM6GLEo1e7yp 8v/5/R12Lf9gO1n4UV2ksT20y+l9sdphuFg0r0oQT1pTW7M40DQo/S+h/Fuje0WNmrwR1wEObFOt3 rCKUHSp9yfWoPAtmdHn3Dya0qTgk8LwcSTaOY0KZYbjXODg1A2irtSUN81x5jZT8t4nZ+pzLSfRHH yC7EJFC9e7Mp6N68gGtSMDfNo/bNh63K0T51R4ps3rZMnniOjzmTbstjyk2a7gm/2lGlDSnsosWTi 4S6Ilkxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tVAgX-00000005Exf-43Jl; Tue, 07 Jan 2025 14:35:57 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tVAfi-00000005Eqc-3JaX for barebox@lists.infradead.org; Tue, 07 Jan 2025 14:35:10 +0000 Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=[127.0.0.1]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1tVAfg-00071N-Jf; Tue, 07 Jan 2025 15:35:04 +0100 Message-ID: <9c8d6171-c228-4e4a-97da-f1ce93e14aed@pengutronix.de> Date: Tue, 7 Jan 2025 15:35:04 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Konstantin Kletschke Cc: barebox@lists.infradead.org References: <19923329-f254-435d-9557-5e1b6835b8ec@pengutronix.de> <49df1ec9-aca8-49b0-95fe-d577c5b615db@pengutronix.de> <0125561a-a868-43da-a7d3-4b85540cc78d@pengutronix.de> <76532287-74b7-42ca-860c-b2e6bda8484e@pengutronix.de> Content-Language: en-US From: Ahmad Fatoum In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250107_063506_830907_C5DF576C X-CRM114-Status: GOOD ( 17.47 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.3 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: Reset on Beaglebone Black has become unreliable/broken X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) Hello Konstantin, On 07.01.25 14:12, Konstantin Kletschke wrote: > On Tue, Jan 07, 2025 at 12:17:03PM +0100, Ahmad Fatoum wrote: > Should add a delay of 1.8ms. Is this feasible? Sounds ok to me. Please send a patch to that effect with an explanatory comment, summarizing what hardware was observed to have what issues. >> If it's indeed just a millisecond, I am in favor of adding this to >> barebox upstream with a comment explaining what this fixes, even >> if we don't fully understand it yet. > > Yes, I agree to the not fully yet understood part. > What me holds back from lowering the speed is the following: > > I went into production with the final result part above and reflashe all > our BBB devices which failed warm start without the additional delay and > all passed 100% flawlessly after the modficication. So it is tested upon > roughly 30 devices which failed before. I am surprised you are still shipping new products with a Beaglebone Black, but anyhow, we need to be pragmatic and a ~2ms delay, even if not completely understood is an acceptable price to pay for barebox reliably starting up on newly produced BBBs. Cheers, Ahmad > > Kind Regards > Konstantin > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |