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 165DBEB64DA for ; Wed, 5 Jul 2023 14:42:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232441AbjGEOmj (ORCPT ); Wed, 5 Jul 2023 10:42:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232475AbjGEOmi (ORCPT ); Wed, 5 Jul 2023 10:42:38 -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 97B961B6; Wed, 5 Jul 2023 07:42:37 -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 2DA4D61578; Wed, 5 Jul 2023 14:42:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E85DC433C7; Wed, 5 Jul 2023 14:42:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688568156; bh=89PZ/QaDV/f5qPoJLlgOoWPxoC4vw+BEViZ9AyZWsfg=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=DfJpQcZ5wYbIRdrAxfvkOEeQ58K5JIHMs2FykL5zAQ2Pv1iLJaDus12bGeMN5OIni /D0lLEsHoJ68qb2bWiEIORQV+3sph/xv9ZxP/oakwPnlxKQYcPeIwNsHH+5uX1f6+j 1zQdvnww3UBWVPg1Z2nJ0ILX7uqBx7lb05o0Fe4CQB1S5X9MWiyLXhx4xN3lsIqAWx nzrHbS1MJgvtMYBmpB+zMkSzM8iUMIDrneRNkvqK1ETFJ6vV5glD8ABGTKfKJz56pj oN3ZVXO1IctgMPpWmdDJuGm/+YEdlAeXX2T4iQFNVsFE50XMkGYWqre3TxkZUjXPpt x+hYbs5HsGqQw== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: =?utf-8?B?6L+Q6L6J5bSU?= , Jessica Clarke , Emil Renner Berthing Cc: 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 Subject: Re: [External] [PATCH v2 1/3] riscv: obtain ACPI RSDP from FFI. In-Reply-To: <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> References: <20230702095735.860-1-cuiyunhui@bytedance.com> <20230703-71f67eb66a037f5c0fb825c6@orel> <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> Date: Wed, 05 Jul 2023 16:42:33 +0200 Message-ID: <87bkgql8rq.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 Jessica Clarke writes: > On 3 Jul 2023, at 19:58, Emil Renner Berthing wrote: >>=20 >> On Mon, 3 Jul 2023 at 15:33, =E8=BF=90=E8=BE=89=E5=B4=94 wrote: >>>=20 >>> Hi drew, >>>=20 >>> On Mon, Jul 3, 2023 at 9:01=E2=80=AFPM Andrew Jones wrote: >>>>=20 >>>>=20 >>>> (This is a reply to a non-existent cover letter.) >>>=20 >>> This has been discussed many times with Ard, Please refer to : >>> https://patches.linaro.org/project/linux-acpi/patch/20230426034001.16-1= -cuiyunhui@bytedance.com/ >>=20 >> Hi Yunhui, >>=20 >> From that discussion it was mentioned that that arm supports 3 methods >> of booting: >> direct + devicetree >> EFI + devicetree >> EFI + ACPI >> ..but not >> direct + ACPI >>=20 >> 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 least= 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 one = a la > U-Boot)? Well said! Yunhui, why not simply add a minimal UEFI stub to Coreboot (like Jess points out above)? IMO what U-boot (or https://github.com/cloud-hypervisor/rust-hypervisor-firmware if you're into Rust ;-)) is doing, and just having a small UEFI shim is the way to go. 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 B4F30EB64DA for ; Wed, 5 Jul 2023 14:42:49 +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=YeMHwPZH9hZ7HoA+YAP4TDRt6dNkiABr6peUHrdJnhs=; b=Ey/IThc3Zhz+G5 qiAuv4yY3oO3Qj9D9roIn0TjAaSlR/9hhGVz2HAFacvOUZnc+ujO+dcnf5JQatDiG001AuhnkJ+R3 +Npi2suFPmAVkv+VwJc7uGNpXonlDGBLyMuSXJ2BJj9APCbNUUVw1wRKY1FSaq3D950CHYCdgMlI6 7BYtcRlBjJsT29v3yCh8d6oFlDC/SzQotwm1y/gJiw0QJXJPUfd1WXVyqeBs4WSakRpjfv2sGxYfl 6N1eL/adGO5EsnarXSE8Q0nHl13yWIwpHltKP340Q7Ia9nMa+tFpuuhx0Rr1n0Qe353XjaBgRiCdy ipfUaUby81bKEeaPS7Dw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qH3iL-00GAtF-06; Wed, 05 Jul 2023 14:42:41 +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 1qH3iI-00GAr6-2H for linux-riscv@lists.infradead.org; Wed, 05 Jul 2023 14:42:40 +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 0249C615D7; Wed, 5 Jul 2023 14:42:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E85DC433C7; Wed, 5 Jul 2023 14:42:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688568156; bh=89PZ/QaDV/f5qPoJLlgOoWPxoC4vw+BEViZ9AyZWsfg=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=DfJpQcZ5wYbIRdrAxfvkOEeQ58K5JIHMs2FykL5zAQ2Pv1iLJaDus12bGeMN5OIni /D0lLEsHoJ68qb2bWiEIORQV+3sph/xv9ZxP/oakwPnlxKQYcPeIwNsHH+5uX1f6+j 1zQdvnww3UBWVPg1Z2nJ0ILX7uqBx7lb05o0Fe4CQB1S5X9MWiyLXhx4xN3lsIqAWx nzrHbS1MJgvtMYBmpB+zMkSzM8iUMIDrneRNkvqK1ETFJ6vV5glD8ABGTKfKJz56pj oN3ZVXO1IctgMPpWmdDJuGm/+YEdlAeXX2T4iQFNVsFE50XMkGYWqre3TxkZUjXPpt x+hYbs5HsGqQw== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: =?utf-8?B?6L+Q6L6J5bSU?= , Jessica Clarke , Emil Renner Berthing Cc: 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 Subject: Re: [External] [PATCH v2 1/3] riscv: obtain ACPI RSDP from FFI. In-Reply-To: <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> References: <20230702095735.860-1-cuiyunhui@bytedance.com> <20230703-71f67eb66a037f5c0fb825c6@orel> <50F3BD62-78F1-456E-A44A-0C7D9A2D4113@jrtc27.com> Date: Wed, 05 Jul 2023 16:42:33 +0200 Message-ID: <87bkgql8rq.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-20230705_074238_848222_4F2E818D X-CRM114-Status: GOOD ( 12.99 ) 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 SmVzc2ljYSBDbGFya2UgPGpydGMyN0BqcnRjMjcuY29tPiB3cml0ZXM6Cgo+IE9uIDMgSnVsIDIw MjMsIGF0IDE5OjU4LCBFbWlsIFJlbm5lciBCZXJ0aGluZyA8ZW1pbC5yZW5uZXIuYmVydGhpbmdA Z21haWwuY29tPiB3cm90ZToKPj4gCj4+IE9uIE1vbiwgMyBKdWwgMjAyMyBhdCAxNTozMywg6L+Q 6L6J5bSUIDxjdWl5dW5odWlAYnl0ZWRhbmNlLmNvbT4gd3JvdGU6Cj4+PiAKPj4+IEhpIGRyZXcs Cj4+PiAKPj4+IE9uIE1vbiwgSnVsIDMsIDIwMjMgYXQgOTowMeKAr1BNIEFuZHJldyBKb25lcyA8 YWpvbmVzQHZlbnRhbmFtaWNyby5jb20+IHdyb3RlOgo+Pj4+IAo+Pj4+IAo+Pj4+IChUaGlzIGlz IGEgcmVwbHkgdG8gYSBub24tZXhpc3RlbnQgY292ZXIgbGV0dGVyLikKPj4+IAo+Pj4gVGhpcyBo YXMgYmVlbiBkaXNjdXNzZWQgbWFueSB0aW1lcyB3aXRoIEFyZCwgUGxlYXNlIHJlZmVyIHRvIDoK Pj4+IGh0dHBzOi8vcGF0Y2hlcy5saW5hcm8ub3JnL3Byb2plY3QvbGludXgtYWNwaS9wYXRjaC8y MDIzMDQyNjAzNDAwMS4xNi0xLWN1aXl1bmh1aUBieXRlZGFuY2UuY29tLwo+PiAKPj4gSGkgWXVu aHVpLAo+PiAKPj4gRnJvbSB0aGF0IGRpc2N1c3Npb24gaXQgd2FzIG1lbnRpb25lZCB0aGF0IHRo YXQgYXJtIHN1cHBvcnRzIDMgbWV0aG9kcwo+PiBvZiBib290aW5nOgo+PiAgZGlyZWN0ICsgZGV2 aWNldHJlZQo+PiAgRUZJICsgZGV2aWNldHJlZQo+PiAgRUZJICsgQUNQSQo+PiAuLmJ1dCBub3QK Pj4gIGRpcmVjdCArIEFDUEkKPj4gCj4+IFRvIG1lIGl0IGlzbid0IG9idmlvdXMgZnJvbSB0aGF0 IG9yIHRoaXMgdGhyZWFkLCBhbmQgc2luY2UgYXJtIHNlZW1zCj4+IHRvIGJlIGRvaW5nIGZpbmUg d2l0aG91dCB0aGUgNHRoIG9wdGlvbiBJJ20gY3VyaW91cyB3aHkgdGhhdCdzCj4+IG5lY2Vzc2Fy eSBvbiByaXNjdj8KPgo+IElmIGFueXRoaW5nIHdlIHNob3VsZCBiZSByZW1vdmluZyBvcHRpb24g MSwgYmVjYXVzZSB0aGF04oCZcyBub3QgYQo+IGNyb3NzLU9TIHN0YW5kYXJkICh0aG91Z2ggUklT Qy1W4oCZcyBTQkkgZGlyZWN0IGJvb3RpbmcgaXMgYXQgbGVhc3Qgbm90Cj4gdGllZCB0byB0aGUg T1MpLiBBbnkgYXBwbGljYXRpb24tY2xhc3MgcGxhdGZvcm0gc3BlYyBpcyBnb2luZyB0bwo+IG1h bmRhdGUgRUZJLCBiZWNhdXNlLCB3aGF0ZXZlciB5b3VyIHRob3VnaHRzIG9mIEVGSSBhcmUsIHRo YXQgaXMgKnRoZSoKPiBzdGFuZGFyZC4gQW5kIGlmIHlvdeKAmXJlIHdpbGxpbmcgdG8gcGljayB1 cCBhbGwgdGhlIGNvbXBsZXhpdHkgb2YgQUNQSSwKPiB3aGF04oCZcyBhIGJpdCBvZiBFRkkgKGVz cGVjaWFsbHkgaWYgeW91IG9ubHkgZ28gZm9yIGEgbWluaW1hbCBvbmUgYSBsYQo+IFUtQm9vdCk/ CgpXZWxsIHNhaWQhCgpZdW5odWksIHdoeSBub3Qgc2ltcGx5IGFkZCBhIG1pbmltYWwgVUVGSSBz dHViIHRvIENvcmVib290IChsaWtlIEplc3MKcG9pbnRzIG91dCBhYm92ZSk/CgpJTU8gd2hhdCBV LWJvb3QgKG9yCmh0dHBzOi8vZ2l0aHViLmNvbS9jbG91ZC1oeXBlcnZpc29yL3J1c3QtaHlwZXJ2 aXNvci1maXJtd2FyZSBpZiB5b3UncmUKaW50byBSdXN0IDstKSkgaXMgZG9pbmcsIGFuZCBqdXN0 IGhhdmluZyBhIHNtYWxsIFVFRkkgc2hpbSBpcyB0aGUgd2F5IHRvCmdvLgoKX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGluZyBs aXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVh ZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=