From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 456C6C433DF for ; Sun, 28 Jun 2020 19:56:24 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 110A92053B for ; Sun, 28 Jun 2020 19:56:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="26LBgPXr"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dVh4v78r" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 110A92053B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; 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=XlJP/UK0ttz5qkpJJUsveuNbwZkuVKVQDa5Om/m41zk=; b=26LBgPXrkCiVQ08PM8M9mJ52YA PWla8zoyb3TbwPWDgFaapcH13+gExuVGrToJx9W/TIsTaH9M7Nu+ouihyO1zMAPMMwe0g+Q3/toOS OFJiPT5j8pAbACmXAWeCereV0FZFkMCq6TOm5n096iPIzxPCTNNsoADtNROpeRHdtqw7JEBgi/EEB OPQsE6tS8WkEqAaZD0koxkWgAYgQqs8NOV+rhZA9PGei7NVlOSNoIAjvIYbhgN70ONLRqXzOxPv1R OPsNjDJ/biq4R1mvsogU5xfAcXp0tf/PeqhmgMyL10irqps7v/UNowhLGlNSPy3UXE/3YLDoynk4N cKhiv7Mg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jpdPW-0004No-58; Sun, 28 Jun 2020 19:56:18 +0000 Received: from mail-qt1-x844.google.com ([2607:f8b0:4864:20::844]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jpdPU-0004NY-Hl for linux-riscv@lists.infradead.org; Sun, 28 Jun 2020 19:56:17 +0000 Received: by mail-qt1-x844.google.com with SMTP id e12so11361492qtr.9 for ; Sun, 28 Jun 2020 12:56:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=MKmINPh1FRPrjfrGQ5s9Iv1ni2wlT0v48XVHAcMsEa8=; b=dVh4v78rLubVgVI7gMbglkN2N/NxpUCRK1ys8ZdyRbhXSurR8c7JiWz7zjniGKGsCM vKNU3bJa9YGXW6cIF/AXfNNjaf1J2qXTQIJbNsCCcwGvL5WfFEshdVMCaw5j6Xf9Jnk7 baztjNBTlWKJ/mN73FnOciTiTt6NMLyNNB5CN748KK/NTIgM4TOrKqMNkOv7UxMPF9qG dqImm2pQ32Hub7rbKUbtZxD6uRjEd9Oy3Bka0vICj3YcRqOC2+qCKdsjn1wAmu3jlZ3S oO80imc59/mtiF9W8+C1Ne9vdKHQqKDwmtVGpni9KUzW9VIZqjfPxezyyG/iKH8FDJvr UbeA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:autocrypt:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=MKmINPh1FRPrjfrGQ5s9Iv1ni2wlT0v48XVHAcMsEa8=; b=ckkV4M9MYGWuimanI//AzOjPqpwKmp7noHu65R0e/W1OAB9z3quPuV0rJqnZ1xG/d5 rHZJNkHMSYcOZUqMCGG7ECygLA/ZA4i74MKNRqabDRR7iAhbvi1J4XGZx3Rr56PDikKw vMx6AlOa8IKbQM6negMldAlxMBkMdVMfp2OI6LduC9Kb+OMeG7Ee+cjnEFGcbLR3V6Vh 9ENMUjOzauwkgrwSoszngwEy+f8eZtOzPfPsbKOmZ/TKskI5xvl3JT+wglPmqHFumRfU +bYHGLX2PovfeXF979Dcnclla0BKdZhiy01fR5RtENZvrI9NQc4MoUhpENw4gXdiXUan 7scQ== X-Gm-Message-State: AOAM530UHKTrdh+w5kubTXRQEMlj+7r3Tq8QWri7+2LL3Hr4hs9GBq/5 7vbeIs8Nn4y/C/1sSlbVWN4= X-Google-Smtp-Source: ABdhPJwjCStMKzmw+qb3Z5ldiFv9ycqvOYxrLxa+Kq1VazcDQVkvAYlRo7cVJdPzBSO1jHzmUMmKPg== X-Received: by 2002:ac8:110a:: with SMTP id c10mr13018111qtj.163.1593374174048; Sun, 28 Jun 2020 12:56:14 -0700 (PDT) Received: from [192.168.1.209] (pool-108-51-35-162.washdc.fios.verizon.net. [108.51.35.162]) by smtp.googlemail.com with ESMTPSA id w185sm11197127qkb.112.2020.06.28.12.56.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 28 Jun 2020 12:56:13 -0700 (PDT) Subject: Re: Kendryte K210: state of MMU support? To: Drew Fustini , "linux-riscv@lists.infradead.org" , Atish Patra , Anup Patel , Damien Le Moal , Carlos Eduardo de Paula References: From: Sean Anderson Autocrypt: addr=seanga2@gmail.com; prefer-encrypt=mutual; keydata= mQENBFe74PkBCACoLC5Zq2gwrDcCkr+EPGsT14bsxrW07GiYzQhLCgwnPdEpgU95pXltbFhw 46GfyffABWxHKO2x+3L1S6ZxC5AiKbYXo7lpnTBYjamPWYouz+VJEVjUx9aaSEByBah5kX6a lKFZWNbXLAJh+dE1HFaMi3TQXXaInaREc+aO1F7fCa2zNE75ja+6ah8L4TPRFZ2HKQzve0/Y GXtoRw97qmnm3U36vKWT/m2AiLF619F4T1mHvlfjyd9hrVwjH5h/2rFyroXVXBZHGA9Aj8eN F2si35dWSZlIwXkNu9bXp0/pIu6FD0bI+BEkD5S7aH1G1iAcMFi5Qq2RNa041DfQSDDHABEB AAG0K1NlYW4gR2FsbGFnaGVyIEFuZGVyc29uIDxzZWFuZ2EyQGdtYWlsLmNvbT6JAVcEEwEK AEECGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4ACGQEWIQSQYR1bzo1I0gPoYCg+6I/stKEQ bgUCXT+S2AUJB2TlXwAKCRA+6I/stKEQbhNOB/9ooea0hU9Sgh7PBloU6CgaC5mlqPLB7NTp +JkB+nh3Fqhk+qLZwzEynnuDLl6ESpVHIc0Ym1lyF4gT3DsrlGT1h0Gzw7vUwd1+ZfN0CuIx Rn861U/dAUjvbtN5kMBqOI4/5ea+0r7MACcIVnKF/wMXBD8eypHsorT2sJTzwZ6DRCNP70C5 N1ahpqqNmXe0uLdP0pu55JCqhrGw2SinkRMdWyhSxT56uNwIVHGhLTqH7Q4t1N6G1EH626qa SvIJsWlNpll6Y3AYLDw2/Spw/hqieS2PQ/Ky3rPZnvJt7/aSNYsKoFGX0yjkH67Uq8Lx0k1L w8jpXnbEPQN3A2ZJCbeMuQENBF0/k2UBCADhvSlHblNc/aRAWtCFDblCJJMN/8Sd7S9u4ZRS w1wIB4tTF7caxc8yfCHa+FjMFeVu34QPtMOvd/gfHz0mr+t0PiTAdDSbd6o7tj+g5ylm+FhT OTUtJQ6mx6L9GzMmIDEbLxJMB9RfJaL2mT5JkujKxEst6nlHGV/lEQ54xBl5ImrPvuR5Dbnr zWQYlafb1IC5ZFwSMpBeSfhS7/kGPtFY3NkpLrii/CF+ME0DYYWxlkDIycqF3fsUGGfb3HIq z2l95OB45+mCs9DrIDZXRT6mFjLcl35UzuEErNIskCl9NKlbvAMAl+gbDH275SnE44ocC4qu 0tMe7Z5jpOy6J8nNABEBAAGJATwEGAEKACYWIQSQYR1bzo1I0gPoYCg+6I/stKEQbgUCXT+T ZQIbDAUJAeEzgAAKCRA+6I/stKEQbjAGB/4mYRqZTTEFmcS+f+8zsmjt2CfWvm38kR+sJFWB vz82pFiUWbUM5xvcuOQhz698WQnIazbDGSYaOipyVNS52YiuYJDqMszzgw++DrcSuu0oRYWN EWCkJjxMqjGg8uY0OZ6FJG+gYRN5wMFErGfV1OqQ7l00FYA9OzpOEuW9PzPZEutFnAbbh77i zvxbQtT7IJCL24A4KutNYKmWg98im4mCzQcJCxE86Bv69ErLVPUyYbp4doLadScilXlvkkjL iq1wOt3rRzOuw+qnWVgWGBPxdDftz0Wck941tYF9XE0aMgkf4o1sGoDZFUFPCQdfEYPzzV7O S5hN3/mP5UeooFHb Message-ID: <25d7abde-b3a5-4488-ea93-e0aca9e0693f@gmail.com> Date: Sun, 28 Jun 2020 15:56:12 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 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: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 6/28/20 11:54 AM, Drew Fustini wrote: > Hello - as far as I know, the MMU in the K210 is still not supported by Linux. > > Anyone know of progress that has been made? > > Thanks, > Drew > AFAIK support for the MMU is not planned, since it follows an older version of the privilege-mode specs. For discussion, see [1], [2]. The CSRs to configure the MMU on the K210 can only be accessed via M-mode, so the existing boot-chain with OpenSBI before Linux would not work. In addition, as discussed in [1], there are some ties between M-mode Linux and NOMMU on riscv. Aside from that, the only other major differences are in the layout of some CSRs. --Sean [1] https://lore.kernel.org/linux-riscv/mhng-a9c74759-ab94-4270-a993-9df380811220@palmerdabbelt-glaptop1/T/#m56d9c49c53b104e282106005bf6d289cad4970a3 [2] https://lore.kernel.org/linux-riscv/20200312051107.1454880-1-damien.lemoal@wdc.com/T/#m137c2c073481f21207c92633550e6465ffc1c550 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv