From owner-freebsd-arm@freebsd.org Wed Mar 14 06:39:08 2018 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 064AAF595D8; Wed, 14 Mar 2018 06:39:08 +0000 (UTC) (envelope-from mizhka@gmail.com) Received: from mail-lf0-x244.google.com (mail-lf0-x244.google.com [IPv6:2a00:1450:4010:c07::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 431A46F7FF; Wed, 14 Mar 2018 06:39:07 +0000 (UTC) (envelope-from mizhka@gmail.com) Received: by mail-lf0-x244.google.com with SMTP id l191-v6so3089759lfe.1; Tue, 13 Mar 2018 23:39:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=9go4XGkk/pMlbmKrAKO9ZEvewlsQWgjy9WNaxzNYAXU=; b=plH1zOKyxnSPb7pdmbfYePcAonD6hnh2spyHDnGuiKo3yleiBNMvoQENVc7C7icEKp 0BgnS/NmkUwOHTjSYVpE8Ug8CnbifQE/BPeRmF6pl2EU3Y2tB0oCxDaL+jpa6AF5onEp kGvkFoONXZDraQJVUyXkK3GuXAY9FWxoK1Hgls92JC8Z2KHeFWIf9b35CNqleYHcVeO2 BEFAEkK2Qumt990bcXEukTkMjLySENHY/4/7fP2aYl3ZrM9cWFxSa+qxMJv4RG1o34fG HmS4FIvyi8OqU8o5YQQkgsYKMcY9C8hCFVBOv2E2lpdN0USdwJXVVylcEqMSpMMosduw hw7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=9go4XGkk/pMlbmKrAKO9ZEvewlsQWgjy9WNaxzNYAXU=; b=oOQah07A2idk/m7Yu+qFYPto4LEDy27cbqQ6/EK6dEZkArRQL+Zz2MKPOZtpapbtcR HYz6Ml/t4i3FtwUE1qohuA+IoiSLfnkg/jJHk4W/cOMtjfvZ4ZcrgI958PKHJlGejo2w CqQQJhcwwR4FYyAVDhG7AY/kSMjENbj9NjHo+q5gSgE6KLBxw2P50GWMEY8Z/mwlviud FSFXhccSYaYcf8qYvopwXHda4DMkPfjksRFAmt4ylnImdRTT5qgukWA86V1ilR7Dtc3U n0vbmHUaWzxQGw/ZJ8t7dmVvtVd6dzGoZEaP06AhaT8Us4Z0xVlHIMOProPpHeknn3jx Ixow== X-Gm-Message-State: AElRT7EcKmmAUMr0jxVeLkUWbPiIO+tpGGgutve9zRgUpLfhZZCtn3ko mbpq5+84WTwOkZa1coFq6Tdn7uTeM+WuD96RZHk= X-Google-Smtp-Source: AG47ELstwvI3Fehhh4i7RELKITRPAaeR3Qh04rXS7ORp+jnHylDQdugFVF4dXZMDdd6b5zUqQUxlznp347D4Lp14cQU= X-Received: by 10.46.47.23 with SMTP id v23mr2334966ljv.70.1521009545927; Tue, 13 Mar 2018 23:39:05 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.5.21 with HTTP; Tue, 13 Mar 2018 23:39:05 -0700 (PDT) In-Reply-To: References: From: Michael Zhilin Date: Wed, 14 Mar 2018 15:39:05 +0900 Message-ID: Subject: Re: GSOC 2018 ARM Cortex Processor To: Vishal Gupta Cc: Warner Losh , "freebsd-arm@freebsd.org" , "freebsd-embedded@freebsd.org" , freebsd-mips@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2018 06:39:08 -0000 Added freebsd-mips@ Regarding MIPS, I would like to see support for retail Realtek MIPS chips for instance (RTL8196, RTL8197). There are new brand router models: https://wikidevi.com/wiki/Tenda_AC6_V2 or https://wikidevi.com/wiki/Realtek#bgn_2 Thanks! On Tue, Mar 13, 2018 at 4:49 PM, Vishal Gupta wrote: > Thank you for the reply. > Which new processor would you suggest between PowerPC, ARM, and MIPS > which i can port during the summer period and will also be useful for the > community. > > Vishal Gupta > > On Tue, Mar 13, 2018 at 11:52 AM, Warner Losh wrote: > >> There's not currently any other FreeBSD port that works on a system >> without a MMU. The buffer cache assumes that we can fault in pages as >> needed based on virtual address access. The TEXT sharing between programs >> assumes we can map the same page into multiple processes. The shared >> libraries we have assume something similar, and in some cases copy on write >> on top of that (though that's no different from a HW perspective than these >> first few cases). >> >> So, if you're willing to live without these features, or find some other >> way to accomplish the same sorts of things, a cortex M/R port would be >> tricky. Also, FreeBSD's kernel size may present some obstacles. We're >> optimized for a rich memory environment, so we trade extra copies of code >> to speed up execution of code, which matches the x86 market, as well as the >> high-end of embedded quite well. >> >> If you are looking for a BSD to port to these processors, you might >> consider looking at what www.retrobsd.org has done with their 2.11BSD >> port to the MIPS processor in the PIC32 core with the MIPS M4K >> architecture. It runs in as little as 128k of RAM, while FreeBSD these days >> needs at least 128MB of RAM without careful tuning... >> >> Warner >> >> On Tue, Mar 13, 2018 at 12:07 AM, Michael Zhilin >> wrote: >> >>> Hi, >>> >>> Disclaimer: I'm neither ARM expect nor GSoC person. >>> >>> I may be wrong, but FreeBSD (or Linux, doesn't matter) requires MMU which >>> is my tossing in Cortex M/R family of ARM processors. So it's technically >>> difficult/impossible to port it on non-MMU processor. >>> >>> Added freebsd-arm@ for wide audience. >>> >>> Thank you! >>> >>> >>> >>> On Tue, Mar 13, 2018 at 1:12 PM, Vishal Gupta >> > >>> wrote: >>> >>> > Hi, >>> > I am interested in working on the project to port FreeBSD to ARM >>> Cortex M >>> > or R series microprocessor. Some queries related to the project are :- >>> > 1) What are the expected deliverable for the project. >>> > 2) Where to put my draft proposal for review so that it can be >>> improved. >>> > >>> > An early reply is awaited. >>> > >>> > Thanks and regards, >>> > Vishal Gupta >>> > _______________________________________________ >>> > freebsd-embedded@freebsd.org mailing list >>> > https://lists.freebsd.org/mailman/listinfo/freebsd-embedded >>> > To unsubscribe, send any mail to "freebsd-embedded-unsubscribe@ >>> freebsd.org >>> > " >>> > >>> _______________________________________________ >>> freebsd-embedded@freebsd.org mailing list >>> https://lists.freebsd.org/mailman/listinfo/freebsd-embedded >>> To unsubscribe, send any mail to "freebsd-embedded-unsubscribe@ >>> freebsd.org" >>> >> >> >