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[149.14.88.106]) by smtp.gmail.com with ESMTPSA id z79sm804100wmc.17.2021.10.04.23.42.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 Oct 2021 23:42:27 -0700 (PDT) To: Alexey Kardashevskiy , Christophe Leroy , David Gibson References: <20210927044808.73391-1-david@gibson.dropbear.id.au> <20210927044808.73391-5-david@gibson.dropbear.id.au> <18fa56ee-956e-ee2f-9270-82aa96dfde09@redhat.com> <40cdb137-60c9-43fd-7b48-4858cbd9307c@redhat.com> <6c2ff4e6-4bf4-d310-5e26-c8d2741177bc@redhat.com> <42e5a8c2-b8fa-b9e2-71f1-c8e5cd7f5cef@csgroup.eu> <1397f18f-f187-6f48-ed6c-13c0b77abed9@redhat.com> <9aeb7010-0a17-864a-cfac-ea5d90356085@csgroup.eu> From: Thomas Huth Subject: Re: Deprecate the ppc405 boards in QEMU? (was: [PATCH v3 4/7] MAINTAINERS: Orphan obscure ppc platforms) Message-ID: <0beb4744-5421-2cec-1fe4-6a8b7353d932@redhat.com> Date: Tue, 5 Oct 2021 08:42:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.066, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christophe Leroy , Peter Maydell , dbarboza@redhat.com, Mark Cave-Ayland , Greg Kurz , Wainer dos Santos Moschetta , QEMU Developers , Alexander Graf , qemu-ppc , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= , Cleber Rosa , =?UTF-8?Q?Herv=c3=a9_Poussineau?= , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , "Edgar E. Iglesias" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 05/10/2021 08.18, Alexey Kardashevskiy wrote: > > > On 05/10/2021 15:44, Christophe Leroy wrote: >> >> >> Le 05/10/2021 à 02:48, David Gibson a écrit : >>> On Fri, Oct 01, 2021 at 04:18:49PM +0200, Thomas Huth wrote: >>>> On 01/10/2021 15.04, Christophe Leroy wrote: >>>>> >>>>> >>>>> Le 01/10/2021 à 14:04, Thomas Huth a écrit : >>>>>> On 01/10/2021 13.12, Peter Maydell wrote: >>>>>>> On Fri, 1 Oct 2021 at 10:43, Thomas Huth wrote: >>>>>>>> Nevertheless, as long as nobody has a hint where to find that >>>>>>>> ppc405_rom.bin, I think both boards are pretty useless in QEMU (as >>>>>>>> far as I >>>>>>>> can see, they do not work without the bios at all, so it's >>>>>>>> also not possible >>>>>>>> to use a Linux image with the "-kernel" CLI option directly). >>>>>>> >>>>>>> It is at least in theory possible to run bare-metal code on >>>>>>> either board, by passing either a pflash or a bios argument. >>>>>> >>>>>> True. I did some more research, and seems like there was once >>>>>> support for those boards in u-boot, but it got removed there a >>>>>> couple of years ago already: >>>>>> >>>>>> https://gitlab.com/qemu-project/u-boot/-/commit/98f705c9cefdf >>>>>> >>>>>> https://gitlab.com/qemu-project/u-boot/-/commit/b147ff2f37d5b >>>>>> >>>>>> https://gitlab.com/qemu-project/u-boot/-/commit/7514037bcdc37 >>>>>> >>>>>>> But I agree that there seem to be no signs of anybody actually >>>>>>> successfully using these boards for anything, so we should >>>>>>> deprecate-and-delete them. >>>>>> >>>>>> Yes, let's mark them as deprecated now ... if someone still uses >>>>>> them and speaks up, we can still revert the deprecation again. >>>>> >>>>> I really would like to be able to use them to validate Linux Kernel >>>>> changes, hence looking for that missing BIOS. >>>>> >>>>> If we remove ppc405 from QEMU, we won't be able to do any regression >>>>> tests of Linux Kernel on those processors. >>>> >>>> If you/someone managed to compile an old version of u-boot for one of these >>>> two boards, so that we would finally have something for regression testing, >>>> we can of course also keep the boards in QEMU... >>> >>> I can see that it would be usefor for some cases, but unless someone >>> volunteers to track down the necessary firmware and look after it, I >>> think we do need to deprecate it - I certainly don't have the capacity >>> to look into this. >>> >> >> I will look at it, please allow me a few weeks though. > > Well, building it was not hard but now I'd like to know what board QEMU > actually emulates, there are way too many codenames and PVRs. > > Here is what I was building: > https://github.com/aik/u-boot/tree/ppc4xx-qemu > > CONFIG_SYS_ARCH="powerpc" > CONFIG_SYS_CPU="ppc4xx" > CONFIG_SYS_VENDOR="esd" > CONFIG_SYS_BOARD="pmc405de" > CONFIG_SYS_CONFIG_NAME="PMC405DE" > > Is this any use? If I've got u-boot commit 98f705c9cefdfdba62c069821bbba10273a0a8 right, there used to be SYS_BOARD="405ep" config before that removal, so that sounds like a promising match for the ref405ep of QEMU? The support for "taihu" even got removed earlier, in u-boot commit 123b6cd7a4f75536734a7bff97db6eebce614bd1 , and the commit message says that it did not compile anymore at the end, so you might need to check out an even older version for that one. Thomas