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[80.187.97.184]) by smtp.gmail.com with ESMTPSA id u6sm4170362edt.30.2021.10.11.06.24.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Oct 2021 06:24:38 -0700 (PDT) Subject: Re: Deprecate the ppc405 boards in QEMU? To: David Gibson References: <0beb4744-5421-2cec-1fe4-6a8b7353d932@redhat.com> <3b1570d3-56f5-1184-239a-72791fc8ef83@redhat.com> <881242de-fec8-3296-ffb4-36d2a551d21f@redhat.com> <119bc1c7-22e0-c455-9f34-57a7424f0c52@redhat.com> <7526ae07-0054-69df-c71f-8751858ef0db@redhat.com> From: Thomas Huth Message-ID: Date: Mon, 11 Oct 2021 15:24:36 +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: 7bit 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: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.049, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-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, Alexey Kardashevskiy , QEMU Developers , Christophe Leroy , Greg Kurz , Alexander Graf , qemu-ppc , Wainer dos Santos Moschetta , Cleber Rosa , =?UTF-8?Q?Herv=c3=a9_Poussineau?= , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/10/2021 11.20, David Gibson wrote: > On Mon, Oct 11, 2021 at 10:10:36AM +0200, Thomas Huth wrote: >> On 06/10/2021 09.25, Thomas Huth wrote: >>> On 05/10/2021 23.53, BALATON Zoltan wrote: >>> [...] >>>> Maybe these 405 boards in QEMU ran with modified firmware where the >>>> memory detection was patched out but it seems to detect the RAM so I >>>> wonder where it gets that from. Maybe by reading the SDRAM >>>> controller DCRs ppc4xx_sdram_init() sets up. Then I'm not sure what >>>> it needs the SPD for, I forgot how this worked on sam460ex. Maybe >>>> for the speed calibration, so could be it detects ram by reading >>>> DCRs then tries to get SPD data and that's where it stops as i2c is >>>> not emulated on taihu. This could be confirmed by checking what it >>>> pokes with -d guest_errors that shows accesses to missing devices >>>> but don't know where 405 has the i2c controller and if it's the same >>>> as newer SoCs. If so that could be reused and an i2c bus could be >>>> added with the SPD data like in sam460ex to make u-boot happy or you >>>> could skip this in u-boot. >>> >>> FWIW, I've just tried the latter (skipping the sdram init in u-boot), >>> and indeed, I can get to the u-boot prompt now. >> [...]> I've also attached the patch with my modifications to u-boot. >> >> FYI, the changes can now be found on this branch here: >> >> https://gitlab.com/huth/u-boot/-/commits/taihu >> >> I also added a gitlab-CI file, so you can now download the u-boot.bin as an >> artifact from the corresponding pipeline, e.g.: >> >> https://gitlab.com/huth/u-boot/-/jobs/1667201028 > > Thanks. > > Are you going to send a v2 of your proposed deprecation patches? No, since there was interest in keeping the 405 boards for testing the 405 code in the Linux kernel, and since there is now a way to do at least some very basic testing of these boards (with the u-boot firmware), I don't plan to respin the deprecation patch. I just sent a patch for adding the boards to our CI instead: https://lists.gnu.org/archive/html/qemu-devel/2021-10/msg02072.html Thomas