From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 27 Apr 2026 12:10:52 +0200 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 1wHIvU-00GuET-0c for lore@lore.pengutronix.de; Mon, 27 Apr 2026 12:10:52 +0200 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 1wHIvT-00075p-HJ for lore@pengutronix.de; Mon, 27 Apr 2026 12:10:52 +0200 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=TgGZQvmLLLuS4pCHYuSWEVhqjrcc6esK7dEfFa8CKVU=; b=Csp+EzdNZ3c2gWk8r8z0ZB/dU9 M8N254zIWW8tldh+wns93nQ4ydU4k3qRC0Q8DAYDWWIL+NcGEaEY1zMtfdPJOD9Cv7Ox0IyQS7BRr oNZS7Btaevx6zI2kFsrGevtvZwl7TamaAWG6wzVnbhQowPSVcNpkHxp/2fn7+ag4HBjUDOiVl3Rvt d4KaaXGtYjkbpbMobgvi18eXQ8dAMfXi3K68RLvhdpe72gXBzwsYUGxBOZHHe5ManL6dciAvWMd6u lsZ1X8c6icJtt6hOPJyLcl+RjuTmmCzB251klWzMq5l/eTusgHO2MzqQAfkLbE0sui6FEDcFuaSM1 gyuTydIw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHIuq-0000000Gf2n-3uiU; Mon, 27 Apr 2026 10:10:12 +0000 Received: from cczrelay02.in2p3.fr ([134.158.66.152] helo=cczrelay04.in2p3.fr) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHIum-0000000Geyu-3MbU for barebox@lists.infradead.org; Mon, 27 Apr 2026 10:10:11 +0000 Received: from [134.158.124.135] (clrelecpo09w.in2p3.fr [134.158.124.135]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by cczrelay04.in2p3.fr (Postfix) with ESMTPSA id CBB54800379; Mon, 27 Apr 2026 12:09:29 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 cczrelay04.in2p3.fr CBB54800379 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=in2p3.fr; s=20260401; t=1777284569; bh=TgGZQvmLLLuS4pCHYuSWEVhqjrcc6esK7dEfFa8CKVU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=iQzEHDy02esqCTVVSDkmAY17dpRp/XLIDjaIXUf9dQLwUenWqfzVWyILz5hw9qnY5 3uq7cb/wNx3dcRbTfN9Z3N2tLGNTQnK7GMB1vZixt0AO9fWZ+EqAI5eBHZWrrWbvUZ N7tBRXcA+yjzcy2INNWYJw/qS+hnvTyeyUkgrBmsb3RR6L9F0mPx6eJEEBQrfChbP1 Vcom+MA+XTEYmk7x7KqKWWcn2tCGyPeuWs+VsoIMIolQYIzUFar6DGvqHaxWaUU+A0 B9iVs5A6nOjNjW0wRmTlGAiuTEfCU2uiqXHuf3NOR9JLJ/VuliSesXPtTJmCTVYgS3 dTV39k/4tUdUQ== Message-ID: <09c2d997-08e5-484a-a7ea-3204b304f3b8@clermont.in2p3.fr> Date: Mon, 27 Apr 2026 12:09:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Steffen Trumtrar Cc: ML_Barebox , abbotti@mev.co.uk References: <87mrysizs9.fsf@pengutronix.de> From: David Picard Content-Language: en-US In-Reply-To: <87mrysizs9.fsf@pengutronix.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260427_031009_250416_82438DA1 X-CRM114-Status: GOOD ( 22.46 ) 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=-4.3 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: ARM: socfpga: enclustra-sa2: issue with I2C1 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) Hi Stephen, thanks for your reply, Pins SDA and SCL, GPIO51 and GPIO52 respectively, are specified with the I/O standard 3.3V LVCMOS and a drive strength of 2mA, which is way more than needed, given my 10K pull-up resistors (3.3 / 10K = 0.33mA). I know that 10K is bigger than the usual 2.2K, but probably not big enough to prevent any change on the SCL line. I just see a perfect flat line when I probe the bus. I compared iocsr_config_cyclone5.c and pinmux_config.c in the terasic-de10-nano/ and enclustra-sa2/ directories. There are a lot of differences. But the lines that changed in enclustra-sa2/ when I tried to enable the I2C1 bus are now the same as in the terasic-de10-nano/ directory, which probably makes sense. Does Barebox have to decipher every bit in those cryptic files? David Le 24/04/2026 à 09:27, Steffen Trumtrar a écrit : > On 2026-04-23 at 14:00 +02, David Picard > wrote: > > Hi, > >> Hello, >> >> @Stephen and Ian: I Cc you since I spotted you authored commits >> related to Intel >> SoC FPGA pin muxing. >> > > long time ago ;) > >> I'm trying to enable the I2C1 bus on a Cyclone V-base module, mounted >> on a base >> board. The I2C1 lines connect to a 2.54mm header, on which I attached >> a I²C >> device with pull-up resistors at address 0x40. >> https://www.enclustra.com/en/products/system-on-chip-modules/mercury-sa2/ >> >> >> I can't detect the I²C device, nor can I see any pulse on the SCL >> line, which is >> constantly at +3.3V. >> >> I changed the pin muxing in Quartus, updated the handoff files, >> changed the >> devicetree. The I2C1 bus is visible in Barebox and Linux. More detail >> here: >> https://community.altera.com/discussions/fpga-device/cyclone-v-hps-i2c1-issue-no-activity-on-bus/352583 >> >> > > I remember, that iocsr was 'underdocumented' to say the least... > > Wasn't it possible to change drive strength and those settings or was > that with Xilinx/Zynq? > >> As documented on the Barebox website, I generated the BSP files with >> the Quartus >> script bsp-create-settings and copied the handoff files to the >> Barebox build >> directory. After that, I could see that iocsr_config_cyclone5.c and >> pinmux_config.c had changed. >> https://www.barebox.org/doc/2025.05.0/boards/socfpga.html#updating-handoff-files >> >> https://www.intel.com/content/www/us/en/docs/programmable/683187/20-1/bsp-create-settings.html >> >> >> If someone could give me some hint, that would be really great! > > I see, that the Terasic DE10 Nano uses i2c1. Maybe compare the changed > iocsr with those? > > > Best regards, > Steffen >