Re: 回复: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
Oram, Isaac W
isaac.w.oram at intel.com
Fri May 21 03:38:53 UTC 2021
I think we should patch first and move to a common location later.
Looking at some of your changes and comments, I have these comments:
* Rather than commenting out things you don’t need in the build, our thinking was to allow some unnecessary building in the interest of reducing porting complexity. It doesn’t really matter if you don’t need the PciCf8 library as long as it builds fine.
* If you need the PciLib|MdePkg/Library/BasePciLibPciExpress/BasePciLibPciExpress.inf Instead of the PciLib|MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf, you can just override it in your DSC file after you have included the CoreCommonLib.dsc. This is to reduce the number of includes that a typical board port needs to deal with correctly, but allow fine tuning and optimization later.
* Rather than commenting out or adding !if modifications, you can set the feature PCD to false in your DSC file before including the file. We are allowed to have multiple sections and the tools do a good job of applying them and aggregating them in sensible ways. For example:
#!if gMinPlatformPkgTokenSpaceGuid.PcdPerformanceEnable == TRUE
# PerformanceLib|MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.inf
#!endif
* If you just have:
[PcdsFeatureFlag]
#
# MinPlatform control flags
#
gMinPlatformPkgTokenSpaceGuid.PcdStopAfterDebugInit |FALSE
gMinPlatformPkgTokenSpaceGuid.PcdStopAfterMemInit |FALSE
gMinPlatformPkgTokenSpaceGuid.PcdBootToShellOnly |FALSE
gMinPlatformPkgTokenSpaceGuid.PcdUefiSecureBootEnable |FALSE
gMinPlatformPkgTokenSpaceGuid.PcdTpm2Enable |FALSE
gMinPlatformPkgTokenSpaceGuid.PcdSmiHandlerProfileEnable|TRUE
gMinPlatformPkgTokenSpaceGuid.PcdPerformanceEnable |FALSE
…
!include $(PLATFORM_PACKAGE)/Include/Dsc/CoreCommonLib.dsc
* Then you should get the same result you want.
This is useful feedback and we should think about how we want to enable optimization (stage 7) in a reasonable way. We haven’t gotten that far into the optimization details as we wanted to get the basics worked out, but it might very much make sense to make more of these things controlled by MinPlatform Arch defined feature flags. Or to move to Advanced Features. And some things we haven’t cleaned up yet. We still have USB in common includes, but those drivers should move to an Advanced Feature. The main thing is we want intelligent default behavior so new board porting people can get productive fast without having to know all these edk2 special features. Then as they get things working, they can start to take advantage of more edk2 and UEFI capabilities as they learn them. Eventually hitting an optimization phase where common things can be quickly stripped out if not needed. I hadn’t thought much about build optimization, but I think that this is reasonable to include in scope.
Looking at your feedback/challenges, I see a few options:
· Add more MinPlatform Arch defined feature flags for PCI, SMM, etc.
· Add Advanced Features for them
· Add “Core System Design” includes. E.G. one for x86, one for QEMU, one for RISKV, etc. I am not sure how many of these we would need.
Thoughts and preferences? I think that we need to keep in mind KISS for new board ports and new users.
The checklists should be “Board Porting Activity Checklist” and unfortunately for you both, you are making the first reference QemuOpenBoardPkg and boards and that is a little more involved than making derivatives, which is what those checklists are going to help the most.
Regards,
Isaac
From: Schaefer, Daniel <daniel.schaefer at hpe.com>
Sent: Thursday, May 20, 2021 7:27 PM
To: Oram, Isaac W <isaac.w.oram at intel.com>; devel at edk2.groups.io; gaoliming at byosoft.com.cn; kaaira7319 at gmail.com; Ni, Ray <ray.ni at intel.com>; mikuback at linux.microsoft.com
Cc: Chang, Abner (HPS SW/FW Technologist) <abner.chang at hpe.com>
Subject: Re: 回复: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
Thanks for the answers, that's very helpful, guys!
I've started to replace some of my DSC and FDF with the include files mentioned by Michael.
Since RISC-V doesn't have I/O registers, SMM and some other things, I had to make some changes but not too many.
Maybe for Qemu there would have be some more non-Intel changes.
Would you accept patches to make it more arch agnostic? Or should we first move it out of the Intel directory?
Sorry for hijacking your thread Kaaira, but I hope this discussion would also be helpful for you 🙂
Just like you, I'm trying to convert a QEMU platform to MinPlatform. (And then the other RISC-V platforms)
If you want to have a look, you can check out my progress here: https://github.com/riscv/riscv-edk2-platforms/commits/riscv-virt-minplatform-gh-actions
My plan is:
1. Make DSC and FDF smaller by including generic files (WIP)
2. Try to take advantage of "AdvancedFeatures"
3. Reformat the FD into the FVs mandated by the MinPlatform spec
4. Check the detailed requirements of each stage (e.g. required functions, build files, ...)
I see that each stage in the MinPlatform spec has a checklist. They don't look like checklist but rather steps to achieve a certain state but that's also ok.
See: https://edk2-docs.gitbook.io/edk-ii-minimum-platform-specification/3_stage_1_minimum_debug/311_stage_enabling_checklist
Thanks,
Daniel
________________________________
From: devel at edk2.groups.io<mailto:devel at edk2.groups.io> <devel at edk2.groups.io<mailto:devel at edk2.groups.io>> on behalf of Michael Kubacki <mikuback at linux.microsoft.com<mailto:mikuback at linux.microsoft.com>>
Sent: Friday, May 21, 2021 00:32
To: Oram, Isaac W <isaac.w.oram at intel.com<mailto:isaac.w.oram at intel.com>>; devel at edk2.groups.io<mailto:devel at edk2.groups.io> <devel at edk2.groups.io<mailto:devel at edk2.groups.io>>; Schaefer, Daniel <daniel.schaefer at hpe.com<mailto:daniel.schaefer at hpe.com>>; gaoliming at byosoft.com.cn<mailto:gaoliming at byosoft.com.cn> <gaoliming at byosoft.com.cn<mailto:gaoliming at byosoft.com.cn>>; kaaira7319 at gmail.com<mailto:kaaira7319 at gmail.com> <kaaira7319 at gmail.com<mailto:kaaira7319 at gmail.com>>; Ni, Ray <ray.ni at intel.com<mailto:ray.ni at intel.com>>
Subject: Re: 回复: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
Daniel,
You will specifically find attempts to consolidate common libraries and
modules in DSC and FDF files that can be included into a board package
here -
https://github.com/tianocore/edk2-platforms/tree/master/Platform/Intel/MinPlatformPkg/Include.
Files are split such that they can be included in the corresponding
section in the board package DSC/FDF file. Note there are some mixed
opinions I've encountered in the industry on the complexity trade off
associated with includes in DSC and FDF files.
But as Isaac mentioned, while MinPlatform is designed to support
multiple architectures, it has only be enabled on Intel platforms,
therefore, you should expect to encounter some problems enabling a
different architecture but identifying and/or resolving those would be
very valuable.
As you are exploring how to port a platform to MinPlatform I also
recommend familiarizing yourself the concept of advanced features
described here -
https://github.com/tianocore/edk2-platforms/blob/master/Features/Intel/Readme.md.
You might find your board package is relatively simpler than the
original platform package after accounting for advanced features being
separated out.
Thanks,
Michael
On 5/20/2021 8:05 AM, Oram, Isaac W wrote:
> Daniel,
>
> The MinPlatform spec was intended to be architecture and product
> independent for a “mainstream” set of products. It is intended to
> constrain some of the nearly unlimited extensibility and flexibility of
> UEFI specs and edk2 codebase. We took an 80/20 kind of approach. Base
> design should work for 80% of designs, but some will need to leverage
> full edk2 and UEFI specification flexibility. I think that a basic QEMU
> kind of port would fit in 80% target. I would ultimately like to see a
> progression of edk2 use that starts with QEMU then moves more seamlessly
> to open designs and then proprietary product designs. MinPlatform
> consistency is hoped to help that developer ramp into system firmware
> productivity.
>
> We have only seen MinPlatform applied to Intel based products so far.
> Which is why we are not rushing to move the spec from a 0.7 “broad
> feedback” state to a 1.0 “initially complete” state. Like edk2,
> MinPlatformPkg and BoardModulePkg content is intended to support
> multiple silicon and product architectures and we will happily promote
> content out of “Intel” scope when that is an accurate reflection of use
> and not just wishful thinking. While 100% of uses are Intel scope, it
> makes sense to land in the Intel part of edk2-platforms repo. Similar
> logic applies to Features/Intel content, though more there may have ties
> to Intel specific product features.
>
> The Minimum Platform Arch spec details base requirements for FV layout
> (thus enabling more common code to publish FV details), base silicon
> policy configuration flow (thus more common PEIM/drivers to gather
> config information and reduce board porting to relatively simple
> libraries), and such things. By enabling more common PEIM and drivers,
> we hope to see benefits to ease of use and consistent quality. Similar
> approaches for the other elements of the spec should help to improve
> code sharing.
>
> Anyway, yes, it should be able to help you reduce the copies of “mostly
> common” code that you encountered and the code and spec are open to
> welcome the additional use and feedback from additional applications.
>
> Regards,
> Isaac
>
> *From:*devel at edk2.groups.io <devel at edk2.groups.io<mailto:devel at edk2.groups.io>> *On Behalf Of *Daniel
> Schaefer
> *Sent:* Wednesday, May 19, 2021 8:40 PM
> *To:* devel at edk2.groups.io<mailto:devel at edk2.groups.io>; gaoliming at byosoft.com.cn<mailto:gaoliming at byosoft.com.cn>;
> kaaira7319 at gmail.com<mailto:kaaira7319 at gmail.com>; Ni, Ray <ray.ni at intel.com<mailto:ray.ni at intel.com>>;
> mikuback at linux.microsoft.com<mailto:mikuback at linux.microsoft.com>
> *Subject:* Re: 回复: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
>
> Hi,
>
> that sounds like a great project!
>
> I'm currently trying to create an equivalent of OvmfPkg for the RISCV64
> generic QEMU virt machine.
>
> I don't like how much of my DSC and FDF file has modules that pretty
> much all platforms should have.
>
> MinPlatform would help reduce that, right?
>
> Is MinPlatform flexible enough to account for non-X64 platforms?
>
> If so, then I think Kaaira and I could collaborate.
>
> Cheers,
> Daniel
>
> ------------------------------------------------------------------------
>
> *From:*devel at edk2.groups.io
> <mailto:devel at edk2.groups.io><devel at edk2.groups.io
<mailto:devel at edk2.groups.io%20%0b>> <mailto:devel at edk2.groups.io>> on behalf of Michael Kubacki
> <mikuback at linux.microsoft.com <mailto:mikuback at linux.microsoft.com>>
> *Sent:* Thursday, May 20, 2021 02:57
> *To:* devel at edk2.groups.io<mailto:devel at edk2.groups.io>
> <mailto:devel at edk2.groups.io><devel at edk2.groups.io
<mailto:devel at edk2.groups.io%20%0b>> <mailto:devel at edk2.groups.io>>; gaoliming at byosoft.com.cn<mailto:gaoliming at byosoft.com.cn>
> <mailto:gaoliming at byosoft.com.cn><gaoliming at byosoft.com.cn
<mailto:gaoliming at byosoft.com.cn%20%0b>> <mailto:gaoliming at byosoft.com.cn>>; kaaira7319 at gmail.com<mailto:kaaira7319 at gmail.com>
> <mailto:kaaira7319 at gmail.com><kaaira7319 at gmail.com
<mailto:kaaira7319 at gmail.com%20%0b>> <mailto:kaaira7319 at gmail.com>>; 'Ray Ni' <ray.ni at intel.com
<mailto:ray.ni at intel.com%20%0b>> <mailto:ray.ni at intel.com>>
> *Subject:* Re: 回复: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
>
> I also wanted to add that I will be setting up weekly video calls
> including Ray that we can use to supplement mailing list communication.
>
> I suggest the primary communication mechanism be the mailing list and we
> use those calls for clarification, detailed project planning, and topics
> not directly relevant to the list.
>
> Regards,
> Michael
>
> On 5/19/2021 10:29 AM, Michael Kubacki wrote:
>> Thanks Liming.
>>
>> Hi Kaaira,
>>
>> Welcome! You can contact me at mikuback at linux.microsoft.com<mailto:mikuback at linux.microsoft.com> <mailto:mikuback at linux.microsoft.com>. You
> will
>> sometimes see my email as michael.kubacki at microsoft.com<mailto:michael.kubacki at microsoft.com> <mailto:michael.kubacki at microsoft.com>and
> that is fine
>> to use for communication though I tend to not use it on the mailing list
>> due to way the mail server manipulates plaintext email.
>>
>> GENERIC RESOURCES
>>
>> I'm sharing some general resources in case you are not already familiar
>> with them:
>>
>> 1. https://github.com/tianocore-training/Tianocore_Training_Contents/wiki
> <https://github.com/tianocore-training/Tianocore_Training_Contents/wiki>
>>
>> This one is good for topics like UEFI overview, EDK II concepts, and
>> Minimum Platform.
>>
>> In particular for your project, I recommend looking through the
>> MinPlatform training -
>> https://github.com/tianocore-training/Presentation_FW/blob/master/FW/Presentations/_D_05_EDK_II_Open_Source_MinPlatform_pres_gp.pdf
> <https://github.com/tianocore-training/Presentation_FW/blob/master/FW/Presentations/_D_05_EDK_II_Open_Source_MinPlatform_pres_gp.pdf>
>>
>>
>> 2.
>> https://software.intel.com/content/www/us/en/develop/articles/unified-extensible-firmware-interface.html
> <https://software.intel.com/content/www/us/en/develop/articles/unified-extensible-firmware-interface.html>
>>
>>
>> These whitepapers are useful when you need more in depth detail about a
>> particular area (like capsule update or work related to the memory map).
>> I recommend bookmarking it and keeping it in mind as a reference.
>>
>> 3. https://uefi.org/learning_center/presentationsandvideos/
> <https://uefi.org/learning_center/presentationsandvideos/>
>>
>> Scroll through here if you have some time and see if there's anything
>> interesting. To help keep on your project schedule I don't think these
>> are as important but there is a lot of interesting material there.
>>
>> Reading through some of the key concepts in Beyond BIOS can be helpful
>> and like the UEFI, ACPI, and PI (Platform Initialization) specs at
>> https://uefi.org/specifications <https://uefi.org/specifications>, I
> believe they are most useful as
>> references when you are solving specific problems.
>>
>> PROJECT-SPECIFIC RESOURCES
>>
>> Since your project involves creating QEMU board within the Minimum
>> Platform architecture, you can start looking into:
>>
>> 1. QEMU - An open source machine emulator
>> 2. Minimum Platform Architecture - A software architecture to create
>> basic platform firmware that can be extended with advanced functionality.
>> 3. Intel FSP - Try to understand the high-level goals and how FSP
>> interfaces with firmware.
>>
>> 1. QEMU - https://urldefense.com/v3/__https://www.qemu.org/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbilPs13w$<https://urldefense.com/v3/__https:/www.qemu.org/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbilPs13w$> <https://urldefense.com/v3/__https://www.qemu.org/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbilPs13w$ <https://urldefense.com/v3/__https:/www.qemu.org/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbilPs13w$%20> >
>>
>> Please set up the QEMU environment. Your QemuOpenBoardPkg will need to
>> run on qemu-system-x86_64 at a minimum with a 32-bit PEI and a 64-bit
>> DXE phase. Most real hardware firmwares also use a 32-bit PEI and a
>> 64-bit DXE.
>>
>> I suggest you start with the OvmfPkg README -
>> https://github.com/tianocore/edk2/blob/master/OvmfPkg/README
> <https://github.com/tianocore/edk2/blob/master/OvmfPkg/README>
>>
>> As an initial step you can try to build an OVMF FW with a 32-bit PEI
>> (IA32) and 64-bit DXE (X64) and boot to the EFI shell.
>> OvmfPkg/OvmfPkgIa32X64.dsc can be used to build a firmware for these
>> target architectures.
>>
>> Any time you submit patches to edk2, you can check edk2/maintainers.txt
>> - https://github.com/tianocore/edk2/blob/master/Maintainers.txt
> <https://github.com/tianocore/edk2/blob/master/Maintainers.txt>for the
>> appropriate maintainers and reviewers to CC on the patch. As you can
>> see, Laszlo and Ard are the maintainers for OvmfPkg and Jordan is a
>> reviewer. If there are any questions that require deep expertise in QEMU
>> or OVMF, we will reach out to them. The Minimum Platform code is
>> maintained in the edk2-platforms repository and it has a similar
>> maintainers.txt file for its packages -
>> https://github.com/tianocore/edk2-platforms/blob/master/Maintainers.txt
> <https://github.com/tianocore/edk2-platforms/blob/master/Maintainers.txt>.
>>
>> I suggest you try sending a very trivial patch for a change in the
>> edk2-platforms repository - https://github.com/tianocore/edk2-platforms
> <https://github.com/tianocore/edk2-platforms>
>> to make sure that your git environment is set up properly to format edk2
>> patches and your email service can send patches correctly.
>>
>> We can discuss the details about how to set up your environment and what
>> to change when you are ready. You can use this page to get started -
>> https://github.com/tianocore/tianocore.github.io/wiki/How-To-Contribute
> <https://github.com/tianocore/tianocore.github.io/wiki/How-To-Contribute>.
>>
>> 2. EDK II Minimum Platform Specification -
>> https://urldefense.com/v3/__https://edk2-docs.gitbook.io/edk-ii-minimum-platform-specification/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbQBLRfuQ$<https://urldefense.com/v3/__https:/edk2-docs.gitbook.io/edk-ii-minimum-platform-specification/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbQBLRfuQ$>
> <https://urldefense.com/v3/__https://edk2-docs.gitbook.io/edk-ii-minimum-platform-specification/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbQBLRfuQ$ <https://urldefense.com/v3/__https:/edk2-docs.gitbook.io/edk-ii-minimum-platform-specification/__;!!NpxR!yx4Srk8BWg-LiB0gZHMcs1EFkzoCLbS_Q3OH7XC-51KlOWhG5Zf1nzOl5UbQBLRfuQ$%20> >
>>
>> For your project, this spec will be very useful. It describes why
>> Minimum Platform was created and how it works at a high-level. Like the
>> code, this document is open and available to the community. You might
>> contribute content here in addition to your code. You can fix any bugs
>> or update content in the spec using git patches and the mailing list
>> similar to code.
>>
>> 3. Intel FSP -
>> https://www.intel.com/content/www/us/en/intelligent-systems/intel-firmware-support-package/intel-fsp-overview.html
> <https://www.intel.com/content/www/us/en/intelligent-systems/intel-firmware-support-package/intel-fsp-overview.html>
>>
>>
>> For more information about Intel FSP check out the Intel FSP External
>> Architecture Specification in the link above. v2.2 is currently the
>> latest version.
>>
>> There is an open source QEMU FSP available here
>> https://github.com/universalpayload/fspsdk/tree/qemu_fsp_x64
> <https://github.com/universalpayload/fspsdk/tree/qemu_fsp_x64>. You will
>> find the existing Minimum Platform boards use Intel FSP while OvmfPkg
>> does not use FSP.
>>
>> Firmware is really best learned hands on. Using the links and background
>> info above, I suggest:
>>
>> 1. Read the OvmfPkg readme.
>> 2. Build a 32-bit PEI and 64-bit DXE OVMF FW and boot it to EFI shell
>> using QEMU.
>> 3. Reading through the EDK II Minimum Platform Specification to gain a
>> high level understanding of Minimum Platform.
>> 4. Connect what you read to the code in
>> https://github.com/tianocore/edk2-platforms/tree/master/Platform/Intel
> <https://github.com/tianocore/edk2-platforms/tree/master/Platform/Intel>.
>> Focus on higher level pieces like the board initialization library.
>> 5. Note what each board package is doing. You will find common patterns
>> for what a board package needs to implement to make the system boot.
>> 6. As you read through the code, reference the general resources listed
>> above to understand anything not Minimum Platform specific. Part of the
>> learning process is knowing which spec to use for different interfaces.
>> If you're unsure which spec something is in, feel free to reach out.
>> 7. While looking through the code in edk2-platforms, think about a patch
>> you can send to edk2-platforms for something very trivial such as a bug
>> fix or documentation update.
>> 8. Send the patch and get it reviewed-by the appropriate
>> maintainers/reviewers and merged into the master branch.
>> 9. Read through the code in OvmfPkg. Try to map the work it is doing to
>> the board code you reviewed in edk2-platforms.
>> 10. At this point, you could start outlining major pieces of
>> initialization in OVMF and how they might map to a board package. Try to
>> identify where the initialization pieces would reside in the board
>> package and try to identify challenges that might arise. We will likely
>> spend quite a bit of time here before jumping into too much code.
>>
>> I know this is a lot of info. Please don't hesitate to reach out if you
>> have any questions and I look forward to working with you.
>>
>> Regards,
>> Michael
>>
>> On 5/18/2021 6:05 PM, gaoliming wrote:
>>> Include Michael Kubacki.
>>>
>>> Thanks
>>> Liming
>>>> -----邮件原件-----
>>>> 发件人: devel at edk2.groups.io<mailto:devel at edk2.groups.io>
> <mailto:devel at edk2.groups.io><devel at edk2.groups.io
<mailto:devel at edk2.groups.io%20%0b>> <mailto:devel at edk2.groups.io>> 代表 KAAIRA
>>>> GUPTA
>>>> 发送时间: 2021年5月18日 22:42
>>>> 收件人: Ray Ni <ray.ni at intel.com <mailto:ray.ni at intel.com>>;
> devel at edk2.groups.io<mailto:devel at edk2.groups.io> <mailto:devel at edk2.groups.io>
>>>> 主题: Re: [edk2-devel] GSoC 2021 Qemu OpenBoardPkg Project
>>>>
>>>> On Tue, May 18, 2021 at 08:01:57PM +0530, Kaaira Gupta wrote:
>>>>> Hey everyone,
>>>>>
>>>>> I have been selected as a student developer for the project MinPlatform
>>>>> Qemu OpenBoardPkg under the mentors Ray Ni and Michael Kubacki.
>>>> Thankyou
>>>>> for this opportunity. I have been over the major chapters of Beyond
>>>>> BIOS
>>>>> as recommended by Nate DeSimone. I want to get familiar with the code
>>>>> now to help me undersatnd the community practices and get my hands
>>>>> dirty. Where should I start? What development environment do I need?
>>>>> How can I use this community bonding period to give me a better start
>>>>> for the coding phase?
>>>>>
>>>>> How do the mentors want me to connect with them? Can we have a meet
>>>> to
>>>>> discuss this project's plan to add more details? This would be very
>>>>> helpful for me considering I don't have prior experience with EDK2.
>>>>
>>>> I noticed that the mail-id that I have used of Michael Kubacki doesn't
>>>> exist anymore. Please let me know how I can contact him.
>>>>
>>>>>
>>>>> Thank you,
>>>>> Kaaira
>>>>
>>>> Thanks,
>>>> Kaaira
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>
>
>
>
>
>
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