From mboxrd@z Thu Jan 1 00:00:00 1970 From: sf84@laposte.net (Sebastian Frias) Date: Fri, 20 May 2016 16:28:23 +0200 Subject: Sharing code between Linux and bootloader (U-boot) ? Message-ID: <573F1F07.6040202@laposte.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, Some bootloaders (like U-boot) support several HW devices: serial, network, NAND, USB, etc. most of which are also supported by Linux. So the question is: is code shared? I mean, I understand that the drivers need to talk to the appropriate API, and such API could be different between Linux and U-boot. But putting that aside, would it be naive to imagine that some "core" functionality could be shared? Or would that part be so small it is not worth the effort? Since many companies use both, U-boot and Linux, I would figure they try their best to optimize engineering resources and share code, right? In that case, I also wonder how do they share DT descriptions that right now are being stored in the Linux kernel tree. We'd like to share code/DT for obvious reasons, what would you guys suggest? Best regards, Sebastian From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755601AbcETO2f (ORCPT ); Fri, 20 May 2016 10:28:35 -0400 Received: from smtpoutz28.laposte.net ([194.117.213.103]:56734 "EHLO smtp.laposte.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752346AbcETO2e (ORCPT ); Fri, 20 May 2016 10:28:34 -0400 To: u-boot@lists.denx.de, linux-arm-kernel@lists.infradead.org, LKML Cc: Mason From: Sebastian Frias Subject: Sharing code between Linux and bootloader (U-boot) ? Message-ID: <573F1F07.6040202@laposte.net> Date: Fri, 20 May 2016 16:28:23 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-VR-SrcIP: 83.142.147.193 X-VR-FullState: 0 X-VR-Score: 0 X-VR-Cause-1: gggruggvucftvghtrhhoucdtuddrfeekledrfeeggdejhecutefuodetggdotefrodftvfcurfhrohhf X-VR-Cause-2: ihhlvgemucfntefrqffuvffgnecuuegrihhlohhuthemucehtddtnecunecujfgurhepvffhuffkffgf X-VR-Cause-3: gggtgfesthejrgdttdefjeenucfhrhhomhepufgvsggrshhtihgrnhcuhfhrihgrshcuoehsfhekgees X-VR-Cause-4: lhgrphhoshhtvgdrnhgvtheqnecukfhppeekfedrudegvddrudegjedrudelfeenucfrrghrrghmpehm X-VR-Cause-5: ohguvgepshhmthhpohhuthdphhgvlhhopegludejvddrvdejrddtrddvudegngdpihhnvghtpeekfedr X-VR-Cause-6: udegvddrudegjedrudelfedpmhgrihhlfhhrohhmpehsfhekgeeslhgrphhoshhtvgdrnhgvthdprhgt X-VR-Cause-7: phhtthhopehuqdgsohhotheslhhishhtshdruggvnhigrdguvg X-VR-AvState: No X-VR-State: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Some bootloaders (like U-boot) support several HW devices: serial, network, NAND, USB, etc. most of which are also supported by Linux. So the question is: is code shared? I mean, I understand that the drivers need to talk to the appropriate API, and such API could be different between Linux and U-boot. But putting that aside, would it be naive to imagine that some "core" functionality could be shared? Or would that part be so small it is not worth the effort? Since many companies use both, U-boot and Linux, I would figure they try their best to optimize engineering resources and share code, right? In that case, I also wonder how do they share DT descriptions that right now are being stored in the Linux kernel tree. We'd like to share code/DT for obvious reasons, what would you guys suggest? Best regards, Sebastian From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Frias Date: Fri, 20 May 2016 16:28:23 +0200 Subject: [U-Boot] Sharing code between Linux and bootloader (U-boot) ? Message-ID: <573F1F07.6040202@laposte.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, Some bootloaders (like U-boot) support several HW devices: serial, network, NAND, USB, etc. most of which are also supported by Linux. So the question is: is code shared? I mean, I understand that the drivers need to talk to the appropriate API, and such API could be different between Linux and U-boot. But putting that aside, would it be naive to imagine that some "core" functionality could be shared? Or would that part be so small it is not worth the effort? Since many companies use both, U-boot and Linux, I would figure they try their best to optimize engineering resources and share code, right? In that case, I also wonder how do they share DT descriptions that right now are being stored in the Linux kernel tree. We'd like to share code/DT for obvious reasons, what would you guys suggest? Best regards, Sebastian