From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 05 Mar 2021 11:51:54 +0100 Received: from [2001:67c:670:201:290:27ff:fe1d:cc33] (helo=metis.ext.pengutronix.de) by lore.white.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lI83m-0002Xo-MV for lore@lore.pengutronix.de; Fri, 05 Mar 2021 11:51:54 +0100 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lI83b-0008QD-Ll for lore@pengutronix.de; Fri, 05 Mar 2021 11:51:44 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=XOC59Gg7Tx0imCTXB7NGId+xb3dZ/KhbTJLAR2WjB8Q=; b=IuLU07MHhZEVWjXBALYwaVXrq ObOFO1W2nGJHqm9/j99nA0i9fiYaeYERX92LOcuhQpQxDE/LKFY3kDmIKfIUcfk/K6tIF1rU4+T2s eOssbIdCPUuYbaLe7JZyIPYvya+cOJefNrWrzzmQdJTnPYsz/9wQAUPjzDmgXBS/WW1PBuT0rZZsk xwDbuHrE3PPklU873yRMOyfnUbYpahEywBXqGGZtFG4O5oTzylh3z7wYilrnA4A7lrSI2Ui6MVFGm QYB10ELrgugP2QdtrSet9r2KDeR+bup/dCMThri8s0an39AE4qYDXol4Xrv9bLa8gcCDdFsbfKO8a ERk9Fh7rw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lI81U-00Ed2H-S7; Fri, 05 Mar 2021 10:49:36 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lI80T-00EcyB-Dm for barebox@lists.infradead.org; Fri, 05 Mar 2021 10:48:36 +0000 Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=[IPv6:::1]) by metis.ext.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lI80R-00082B-5u; Fri, 05 Mar 2021 11:48:27 +0100 To: "Barbier, Renaud" , "barebox@lists.infradead.org" References: <092dbc44-2081-ef3b-0fd7-25d1b9da72d3@pengutronix.de> From: Ahmad Fatoum Message-ID: Date: Fri, 5 Mar 2021 11:48:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210305_104834_135961_0E0B96FF X-CRM114-Status: GOOD ( 22.94 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2001:8b0:10b:1:d65d:64ff:fe57:4e05 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.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.4 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: Uart set up in PBL X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) Hello Renaud, On 04.03.21 17:41, Barbier, Renaud wrote: >>> Would it possible from the PBL to read the "baudrate" variable from the >> environment? >> >> Normally, you would want to avoid doing anything, but the >> bare minimum from PBL. Does the baudrate device parameter >> work for you? >> > [Barbier, Renaud] > Just to give you a bit more context. In our platform ARM (all non-pbl) or PPC, we add a call to do a PBIT memory test before starting barebox. The uart is initialized just before that at a fixed baud rate of 9600 bauds. Now we have a requirement to support more than one baud rate configurable by the user. And our next ARM based board is going to have a PBL. > > Are you saying that from the PBL, I can do something like baud=getenv("baudrate") to get the environment variable value. This would require to have /dev/env0 instantiated, would not it? I am saying: don't do it from PBL at all if possible. > Does not that require to have the environment init code (fs support and all) be compiled as part of the PBL (lwl-y +=....). > My environment variables are in QSPI, so I would think I could parse the environment variable without the whole barebox support instead. > If not possible then I think we can find some other way to retrieve the baud rate. So you load pbl/bare init barebox into SRAM, run PBIT memory test on DRAM, then extract/copy barebox proper to DRAM or how does it work? Cheers, Ahmad > > Cheers. > > >> Cheers, >> Ahmad >> >>> >>> Cheers, >>> Renaud >>> >>> >>> _______________________________________________ >>> barebox mailing list >>> barebox@lists.infradead.org >>> >> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.infra >> dead.org%2Fmailman%2Flistinfo%2Fbarebox&data=04%7C01%7Crenaud.b >> arbier%40abaco.com%7C5feb6191d4d647f8afdb08d8df0d5b4c%7Ce6f2745189 >> 9d4d0db8fa88baafa551a7%7C0%7C0%7C637504595763337955%7CUnknown% >> 7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL >> CJXVCI6Mn0%3D%7C1000&sdata=U5XVs%2Bf0L4t6LX49D7IJZNexAa77Pkjy >> kZv74%2FJ8klk%3D&reserved=0 >>> >> >> -- >> Pengutronix e.K. | | >> Steuerwalder Str. 21 | >> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.pen >> gutronix.de%2F&data=04%7C01%7Crenaud.barbier%40abaco.com%7C5fe >> b6191d4d647f8afdb08d8df0d5b4c%7Ce6f27451899d4d0db8fa88baafa551a7%7 >> C0%7C0%7C637504595763337955%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC >> 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&a >> mp;sdata=H1Ifw3D43oCbwUMkyKECroRAm22bBXka2wbBMGFhM%2BE%3D&a >> mp;reserved=0 | >> 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | >> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | > -- 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 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox