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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A47CBEB64DD for ; Thu, 6 Jul 2023 08:52:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229489AbjGFIwU (ORCPT ); Thu, 6 Jul 2023 04:52:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230207AbjGFIwT (ORCPT ); Thu, 6 Jul 2023 04:52:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2EEF1BC2; Thu, 6 Jul 2023 01:52:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5FB8F61866; Thu, 6 Jul 2023 08:52:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F287C433C7; Thu, 6 Jul 2023 08:52:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688633536; bh=ggVTIl5Ohn7qil0HaYjyKOkRlN5j1S5LhF5oA/HxgDs=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=nAAQ8I4u0oL9hHLlo/IXbbKw8j0UTDg3vzzcYaZRFuADEI3gURbH0O9DKjt8D1aKN kDmwv0Qr/cVFXAmFfR2dLyGi7A3EAi9ho2+uYSOLchmnNI+VfPy8UoyBkwrhMknQzM ZIdPoltZ082Zr/hs44C3Z3fGsQsv56AAbwypk7mR3iwPnR36pb5NhtacSgPio1lrB0 2yckYj+tMSfftDmbv8vlu3lPqihTDgTLHqJuPJ/KmvPVg3PjFpU+tHvdyTNqU+yLZL zbZ/Up0WYMimXJlNVEnnTSHAn9qv/eXnMpfjE6145ztLWg+JxbLtMpwOv4iboeVApW OB7BTLbhow/Qg== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: =?utf-8?B?6L+Q6L6J5bSU?= Cc: Jessica Clarke , Emil Renner Berthing , Andrew Jones , Ard Biesheuvel , Palmer Dabbelt , Paul Walmsley , Albert Ou , linux-riscv , rminnich@gmail.com, Mark Rutland , Lorenzo Pieralisi , "Rafael J . Wysocki" , Len Brown , jdelvare@suse.com, yc.hung@mediatek.com, angelogioacchino.delregno@collabora.com, allen-kh.cheng@mediatek.com, pierre-louis.bossart@linux.intel.com, tinghan.shen@mediatek.com, linux-kernel , linux-acpi@vger.kernel.org, geshijian@bytedance.com, weidong.wd@bytedance.com, graf@amazon.de Subject: Re: [External] [PATCH v2 1/3] riscv: obtain ACPI RSDP from FFI. In-Reply-To: References: <20230702095735.860-1-cuiyunhui@bytedance.com> <20230703-71f67eb66a037f5c0fb825c6@orel> <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> <87bkgql8rq.fsf@all.your.base.are.belong.to.us> Date: Thu, 06 Jul 2023 10:52:14 +0200 Message-ID: <87sfa1toap.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org =E8=BF=90=E8=BE=89=E5=B4=94 writes: > Hi Bj=C3=B6rn, > > On Wed, Jul 5, 2023 at 10:43=E2=80=AFPM Bj=C3=B6rn T=C3=B6pel wrote: >> >> Jessica Clarke writes: >> >> > On 3 Jul 2023, at 19:58, Emil Renner Berthing wrote: >> >> >> >> On Mon, 3 Jul 2023 at 15:33, =E8=BF=90=E8=BE=89=E5=B4=94 wrote: >> >>> >> >>> Hi drew, >> >>> >> >>> On Mon, Jul 3, 2023 at 9:01=E2=80=AFPM Andrew Jones wrote: >> >>>> >> >>>> >> >>>> (This is a reply to a non-existent cover letter.) >> >>> >> >>> This has been discussed many times with Ard, Please refer to : >> >>> https://patches.linaro.org/project/linux-acpi/patch/20230426034001.1= 6-1-cuiyunhui@bytedance.com/ >> >> >> >> Hi Yunhui, >> >> >> >> From that discussion it was mentioned that that arm supports 3 methods >> >> of booting: >> >> direct + devicetree >> >> EFI + devicetree >> >> EFI + ACPI >> >> ..but not >> >> direct + ACPI >> >> >> >> To me it isn't obvious from that or this thread, and since arm seems >> >> to be doing fine without the 4th option I'm curious why that's >> >> necessary on riscv? >> > >> > If anything we should be removing option 1, because that=E2=80=99s not= a >> > cross-OS standard (though RISC-V=E2=80=99s SBI direct booting is at le= ast not >> > tied to the OS). Any application-class platform spec is going to >> > mandate EFI, because, whatever your thoughts of EFI are, that is *the* >> > standard. And if you=E2=80=99re willing to pick up all the complexity = of ACPI, >> > what=E2=80=99s a bit of EFI (especially if you only go for a minimal o= ne a la >> > U-Boot)? >> >> Well said! >> >> Yunhui, why not simply add a minimal UEFI stub to Coreboot (like Jess >> points out above)? > > In fact, in the v1 email, Coreboot's maintainer Ron has made it clear > that Coreboot does not support EFI, and it is necessary to transmit > firmware information through DTS on RISC-V. It clear that Coreboot doesn't support UEFI today. We're "arguing" that it's less work/verification adding the neccesary minimal UEFI plumbing for Coreboot, than jumping through hoops in the kernel to work around it. I'm getting some UEFI FUD vibes here. I also think that parts of UEFI is kind of ugly, but it's, as Jess says, *the* spec and honestly, a bit what's expected (Hi CXL). UEFI is a specification, and implementing the minimal requirements for UEFI is not that of a big deal. Look at Alex Graf's (et al) work on u-boot UEFI. U-boot is small/lean/open *and* manage to support enough UEFI for ACPI. The whole "Oh, UEFI is so bad, bloated, and closed" hand-wavery is a bit tiring. :-( ...these last four sections is more of a beer discussion. I'll take my "my FW is better than yours" rants elsewhere. ;-) Bj=C3=B6rn 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4A2CFEB64D9 for ; Thu, 6 Jul 2023 08:52:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:References :In-Reply-To:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=nMo88UxQ5G/frTY559uZ5sSNci5FlUqU4KJeUwjRKl0=; b=POSo2ZZLH7Bq/H JlwAapN6QBVyIg/agixSsowjcWYvw+umqrZZkddmiT7vW1Kqj7Jt73DhdZDv4IZAEx9PIzDBBxFkT 0ITT6BlxWI74UApb9nOGB1Do3VO6sbyaj7q1U/tQRwSI3c1tWwbI5l2NznvDV6Nk09mTZGcuajzUw Y/FuEnfH691D/r1UJi+h5tOdpiH6wcL0vYCDSsvy0+OT/FvZxEf7AwaOcxt5VtA+Vk3lq5e9FaUTu 2l9B4JbOO5O1oZrEvs5Vho5TrLBNFbYS/8IsBPyoOSL38CaLlzmsKCQKDBMDkFCcev3xRnvBzC92/ Fk4Tf+srOTK9Bxv+Sb5g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qHKir-00104c-05; Thu, 06 Jul 2023 08:52:21 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qHKio-00104A-0P for linux-riscv@lists.infradead.org; Thu, 06 Jul 2023 08:52:19 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5D1B461847; Thu, 6 Jul 2023 08:52:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F287C433C7; Thu, 6 Jul 2023 08:52:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688633536; bh=ggVTIl5Ohn7qil0HaYjyKOkRlN5j1S5LhF5oA/HxgDs=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=nAAQ8I4u0oL9hHLlo/IXbbKw8j0UTDg3vzzcYaZRFuADEI3gURbH0O9DKjt8D1aKN kDmwv0Qr/cVFXAmFfR2dLyGi7A3EAi9ho2+uYSOLchmnNI+VfPy8UoyBkwrhMknQzM ZIdPoltZ082Zr/hs44C3Z3fGsQsv56AAbwypk7mR3iwPnR36pb5NhtacSgPio1lrB0 2yckYj+tMSfftDmbv8vlu3lPqihTDgTLHqJuPJ/KmvPVg3PjFpU+tHvdyTNqU+yLZL zbZ/Up0WYMimXJlNVEnnTSHAn9qv/eXnMpfjE6145ztLWg+JxbLtMpwOv4iboeVApW OB7BTLbhow/Qg== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: =?utf-8?B?6L+Q6L6J5bSU?= Cc: Jessica Clarke , Emil Renner Berthing , Andrew Jones , Ard Biesheuvel , Palmer Dabbelt , Paul Walmsley , Albert Ou , linux-riscv , rminnich@gmail.com, Mark Rutland , Lorenzo Pieralisi , "Rafael J . Wysocki" , Len Brown , jdelvare@suse.com, yc.hung@mediatek.com, angelogioacchino.delregno@collabora.com, allen-kh.cheng@mediatek.com, pierre-louis.bossart@linux.intel.com, tinghan.shen@mediatek.com, linux-kernel , linux-acpi@vger.kernel.org, geshijian@bytedance.com, weidong.wd@bytedance.com, graf@amazon.de Subject: Re: [External] [PATCH v2 1/3] riscv: obtain ACPI RSDP from FFI. In-Reply-To: References: <20230702095735.860-1-cuiyunhui@bytedance.com> <20230703-71f67eb66a037f5c0fb825c6@orel> <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> <87bkgql8rq.fsf@all.your.base.are.belong.to.us> Date: Thu, 06 Jul 2023 10:52:14 +0200 Message-ID: <87sfa1toap.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230706_015218_281006_E396C005 X-CRM114-Status: GOOD ( 18.80 ) X-BeenThere: linux-riscv@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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 6L+Q6L6J5bSUIDxjdWl5dW5odWlAYnl0ZWRhbmNlLmNvbT4gd3JpdGVzOgoKPiBIaSBCasO2cm4s Cj4KPiBPbiBXZWQsIEp1bCA1LCAyMDIzIGF0IDEwOjQz4oCvUE0gQmrDtnJuIFTDtnBlbCA8Ympv cm5Aa2VybmVsLm9yZz4gd3JvdGU6Cj4+Cj4+IEplc3NpY2EgQ2xhcmtlIDxqcnRjMjdAanJ0YzI3 LmNvbT4gd3JpdGVzOgo+Pgo+PiA+IE9uIDMgSnVsIDIwMjMsIGF0IDE5OjU4LCBFbWlsIFJlbm5l ciBCZXJ0aGluZyA8ZW1pbC5yZW5uZXIuYmVydGhpbmdAZ21haWwuY29tPiB3cm90ZToKPj4gPj4K Pj4gPj4gT24gTW9uLCAzIEp1bCAyMDIzIGF0IDE1OjMzLCDov5DovonltJQgPGN1aXl1bmh1aUBi eXRlZGFuY2UuY29tPiB3cm90ZToKPj4gPj4+Cj4+ID4+PiBIaSBkcmV3LAo+PiA+Pj4KPj4gPj4+ IE9uIE1vbiwgSnVsIDMsIDIwMjMgYXQgOTowMeKAr1BNIEFuZHJldyBKb25lcyA8YWpvbmVzQHZl bnRhbmFtaWNyby5jb20+IHdyb3RlOgo+PiA+Pj4+Cj4+ID4+Pj4KPj4gPj4+PiAoVGhpcyBpcyBh IHJlcGx5IHRvIGEgbm9uLWV4aXN0ZW50IGNvdmVyIGxldHRlci4pCj4+ID4+Pgo+PiA+Pj4gVGhp cyBoYXMgYmVlbiBkaXNjdXNzZWQgbWFueSB0aW1lcyB3aXRoIEFyZCwgUGxlYXNlIHJlZmVyIHRv IDoKPj4gPj4+IGh0dHBzOi8vcGF0Y2hlcy5saW5hcm8ub3JnL3Byb2plY3QvbGludXgtYWNwaS9w YXRjaC8yMDIzMDQyNjAzNDAwMS4xNi0xLWN1aXl1bmh1aUBieXRlZGFuY2UuY29tLwo+PiA+Pgo+ PiA+PiBIaSBZdW5odWksCj4+ID4+Cj4+ID4+IEZyb20gdGhhdCBkaXNjdXNzaW9uIGl0IHdhcyBt ZW50aW9uZWQgdGhhdCB0aGF0IGFybSBzdXBwb3J0cyAzIG1ldGhvZHMKPj4gPj4gb2YgYm9vdGlu ZzoKPj4gPj4gIGRpcmVjdCArIGRldmljZXRyZWUKPj4gPj4gIEVGSSArIGRldmljZXRyZWUKPj4g Pj4gIEVGSSArIEFDUEkKPj4gPj4gLi5idXQgbm90Cj4+ID4+ICBkaXJlY3QgKyBBQ1BJCj4+ID4+ Cj4+ID4+IFRvIG1lIGl0IGlzbid0IG9idmlvdXMgZnJvbSB0aGF0IG9yIHRoaXMgdGhyZWFkLCBh bmQgc2luY2UgYXJtIHNlZW1zCj4+ID4+IHRvIGJlIGRvaW5nIGZpbmUgd2l0aG91dCB0aGUgNHRo IG9wdGlvbiBJJ20gY3VyaW91cyB3aHkgdGhhdCdzCj4+ID4+IG5lY2Vzc2FyeSBvbiByaXNjdj8K Pj4gPgo+PiA+IElmIGFueXRoaW5nIHdlIHNob3VsZCBiZSByZW1vdmluZyBvcHRpb24gMSwgYmVj YXVzZSB0aGF04oCZcyBub3QgYQo+PiA+IGNyb3NzLU9TIHN0YW5kYXJkICh0aG91Z2ggUklTQy1W 4oCZcyBTQkkgZGlyZWN0IGJvb3RpbmcgaXMgYXQgbGVhc3Qgbm90Cj4+ID4gdGllZCB0byB0aGUg T1MpLiBBbnkgYXBwbGljYXRpb24tY2xhc3MgcGxhdGZvcm0gc3BlYyBpcyBnb2luZyB0bwo+PiA+ IG1hbmRhdGUgRUZJLCBiZWNhdXNlLCB3aGF0ZXZlciB5b3VyIHRob3VnaHRzIG9mIEVGSSBhcmUs IHRoYXQgaXMgKnRoZSoKPj4gPiBzdGFuZGFyZC4gQW5kIGlmIHlvdeKAmXJlIHdpbGxpbmcgdG8g cGljayB1cCBhbGwgdGhlIGNvbXBsZXhpdHkgb2YgQUNQSSwKPj4gPiB3aGF04oCZcyBhIGJpdCBv ZiBFRkkgKGVzcGVjaWFsbHkgaWYgeW91IG9ubHkgZ28gZm9yIGEgbWluaW1hbCBvbmUgYSBsYQo+ PiA+IFUtQm9vdCk/Cj4+Cj4+IFdlbGwgc2FpZCEKPj4KPj4gWXVuaHVpLCB3aHkgbm90IHNpbXBs eSBhZGQgYSBtaW5pbWFsIFVFRkkgc3R1YiB0byBDb3JlYm9vdCAobGlrZSBKZXNzCj4+IHBvaW50 cyBvdXQgYWJvdmUpPwo+Cj4gSW4gZmFjdCwgaW4gdGhlIHYxIGVtYWlsLCBDb3JlYm9vdCdzIG1h aW50YWluZXIgUm9uIGhhcyBtYWRlIGl0IGNsZWFyCj4gdGhhdCBDb3JlYm9vdCBkb2VzIG5vdCBz dXBwb3J0IEVGSSwgYW5kIGl0IGlzIG5lY2Vzc2FyeSB0byB0cmFuc21pdAo+IGZpcm13YXJlIGlu Zm9ybWF0aW9uIHRocm91Z2ggRFRTIG9uIFJJU0MtVi4KCkl0IGNsZWFyIHRoYXQgQ29yZWJvb3Qg ZG9lc24ndCBzdXBwb3J0IFVFRkkgdG9kYXkuIFdlJ3JlICJhcmd1aW5nIiB0aGF0Cml0J3MgbGVz cyB3b3JrL3ZlcmlmaWNhdGlvbiBhZGRpbmcgdGhlIG5lY2Nlc2FyeSBtaW5pbWFsIFVFRkkgcGx1 bWJpbmcKZm9yIENvcmVib290LCB0aGFuIGp1bXBpbmcgdGhyb3VnaCBob29wcyBpbiB0aGUga2Vy bmVsIHRvIHdvcmsgYXJvdW5kCml0LgoKSSdtIGdldHRpbmcgc29tZSBVRUZJIEZVRCB2aWJlcyBo ZXJlLiBJIGFsc28gdGhpbmsgdGhhdCBwYXJ0cyBvZiBVRUZJIGlzCmtpbmQgb2YgdWdseSwgYnV0 IGl0J3MsIGFzIEplc3Mgc2F5cywgKnRoZSogc3BlYyBhbmQgaG9uZXN0bHksIGEgYml0CndoYXQn cyBleHBlY3RlZCAoSGkgQ1hMKS4KClVFRkkgaXMgYSBzcGVjaWZpY2F0aW9uLCBhbmQgaW1wbGVt ZW50aW5nIHRoZSBtaW5pbWFsIHJlcXVpcmVtZW50cyBmb3IKVUVGSSBpcyBub3QgdGhhdCBvZiBh IGJpZyBkZWFsLiBMb29rIGF0IEFsZXggR3JhZidzIChldCBhbCkgd29yayBvbgp1LWJvb3QgVUVG SS4gVS1ib290IGlzIHNtYWxsL2xlYW4vb3BlbiAqYW5kKiBtYW5hZ2UgdG8gc3VwcG9ydCBlbm91 Z2gKVUVGSSBmb3IgQUNQSS4KClRoZSB3aG9sZSAiT2gsIFVFRkkgaXMgc28gYmFkLCBibG9hdGVk LCBhbmQgY2xvc2VkIiBoYW5kLXdhdmVyeSBpcyBhIGJpdAp0aXJpbmcuIDotKAoKLi4udGhlc2Ug bGFzdCBmb3VyIHNlY3Rpb25zIGlzIG1vcmUgb2YgYSBiZWVyIGRpc2N1c3Npb24uIEknbGwgdGFr ZSBteQoibXkgRlcgaXMgYmV0dGVyIHRoYW4geW91cnMiIHJhbnRzIGVsc2V3aGVyZS4gOy0pCgoK QmrDtnJuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwps aW51eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpo dHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==