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envelope-from=fei2.wu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.029, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, T_SPF_HELO_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 3/8/2024 6:15 AM, Marcin Juszkiewicz wrote: > W dniu 4.03.2024 o 11:25, Fei Wu pisze: > >> The RISC-V Server Platform specification[1] defines a standardized >> set of hardware and software capabilities, that portable system >> software, such as OS and hypervisors can rely on being present in a >> RISC-V server platform. This patchset provides a RISC-V Server >> Platform (RVSP) reference implementation on qemu which is in >> compliance with the spec as faithful as possible. > > I am working on sbsa-ref which is AArch64 Standard Server Platform > implementation. Will not go through details of rvsp-ref but give some > potential hints from my work with our platform. > Hi Marcin, Thank you for sharing this. > > 1. Consider versioning the platform. > > We have 'platform_version'.'major/minor' exported in > DeviceTree-formatted data. This allows for firmware to know which of > non-discoverable hardware features exists and which not. We use it to > disable XHCI controller on older platform version. > Looks good, I will add it. > > 2. If specification allows to have non-discoverable devices then add some. > > This will require you to handle them in firmware in some way. Sooner or > later some physical hardware will be in same situation so they can use > your firmware code as reference. We have AHCI and XHCI on system bus > (hardcoded in firmware). > This RFC currently adds the devices like AHCI as PCI devices. > > 3. You are going to use EDK2 with ACPI. Hide DT from code there with > some hardware information library. > > For sbsa-ref we created SbsaHardwareInfoLib in > https://openfw.io/edk2-devel/20240306-no-dt-for-cpu-v6-0-acd8727a1b59@linaro.org/ patchset. > Looks good, I will ask my colleague working on FW part to take a look. Thanks, Fei.