Re: [PATCH v3 2/7] ArmVirtPkg: Add Platform CI and configuration for Core CI

["Leif Lindholm" <leif@nuviainc.com>]

On Fri, Apr 24, 2020 at 14:31:03 -0700, michael.kubacki@outlook.com wrote:
> From: Sean Brogan <sean.brogan@microsoft.com>
> 
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2570
> 
> Add new Azure Pipeline definitions to build and run ArmVirtPkg with:
>   * Ubuntu GCC5
> Add PyTool based build of ArmVirtPkg
> Add extdep for managing the iasl dependency
> Add ArmVirtPkg.ci.yaml for Core CI
> Add ReadMe.md for details and instructions
> 
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
> Cc: Leif Lindholm <leif@nuviainc.com>
> Signed-off-by: Sean Brogan <sean.brogan@microsoft.com>
> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

The contributor attests the compliance of the submission with
https://developercertificate.org/ at the point of contribution by
using Signed-off-by.

Statements by others (including original authors) should not be copied
when copying code between projects. The From: tag preserves authorship
credit.

/
    Leif

> Reviewed-by: Shenglei Zhang <shenglei.zhang@intel.com>
> Acked-by: Laszlo Ersek <lersek@redhat.com>
> Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
> Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>
> ---
>  ArmVirtPkg/ArmVirtPkg.ci.yaml                         | 103 ++++++++
>  ArmVirtPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml |  89 +++++++
>  ArmVirtPkg/PlatformCI/PlatformBuild.py                | 276 ++++++++++++++++++++
>  ArmVirtPkg/PlatformCI/ReadMe.md                       | 125 +++++++++
>  ArmVirtPkg/PlatformCI/iasl_ext_dep.yaml               |  21 ++
>  5 files changed, 614 insertions(+)
> 
> diff --git a/ArmVirtPkg/ArmVirtPkg.ci.yaml b/ArmVirtPkg/ArmVirtPkg.ci.yaml
> new file mode 100644
> index 000000000000..4553725ee528
> --- /dev/null
> +++ b/ArmVirtPkg/ArmVirtPkg.ci.yaml
> @@ -0,0 +1,103 @@
> +## @file
> +# Core CI configuration for ArmVirtPkg
> +#
> +# ArmVirtPkg is part of Platform Ci for builds so this is only
> +# used for code analysis.
> +#
> +# Copyright (c) Microsoft Corporation
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +{
> +    ## options defined .pytool/Plugin/CompilerPlugin
> +    "CompilerPlugin": {
> +        "DscPath": "" # Don't support this test
> +    },
> +
> +    ## options defined .pytool/Plugin/HostUnitTestCompilerPlugin
> +    "HostUnitTestCompilerPlugin": {
> +        "DscPath": "" # Don't support this test
> +    },
> +
> +    ## options defined .pytool/Plugin/CharEncodingCheck
> +    "CharEncodingCheck": {
> +        "IgnoreFiles": []
> +    },
> +
> +    ## options defined .pytool/Plugin/DependencyCheck
> +    "DependencyCheck": {
> +        "AcceptableDependencies": [
> +            "MdePkg/MdePkg.dec",
> +            "MdeModulePkg/MdeModulePkg.dec",
> +            "ArmVirtPkg/ArmVirtPkg.dec",
> +            "NetworkPkg/NetworkPkg.dec",
> +            "ArmPkg/ArmPkg.dec",
> +            "OvmfPkg/OvmfPkg.dec",
> +            "EmbeddedPkg/EmbeddedPkg.dec",
> +            "ArmPlatformPkg/ArmPlatformPkg.dec",
> +            "SecurityPkg/SecurityPkg.dec",
> +            "ShellPkg/ShellPkg.dec"  #Is this ok?
> +        ],
> +        # For host based unit tests
> +        "AcceptableDependencies-HOST_APPLICATION":[
> +            "UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec"
> +        ],
> +        # For UEFI shell based apps
> +        "AcceptableDependencies-UEFI_APPLICATION":[
> +
> +        ],
> +        "IgnoreInf": []
> +    },
> +
> +    ## options defined .pytool/Plugin/DscCompleteCheck
> +    "DscCompleteCheck": {
> +        "IgnoreInf": [""],
> +        "DscPath": ""  # Don't support this test
> +    },
> +
> +    ## options defined .pytool/Plugin/HostUnitTestDscCompleteCheck
> +    "HostUnitTestDscCompleteCheck": {
> +        "IgnoreInf": [""],
> +        "DscPath": "" # Don't support this test
> +    },
> +
> +    ## options defined .pytool/Plugin/GuidCheck
> +    "GuidCheck": {
> +        "IgnoreGuidName": [],
> +        "IgnoreGuidValue": [],
> +        "IgnoreFoldersAndFiles": [],
> +        "IgnoreDuplicates": [],
> +    },
> +
> +    ## options defined .pytool/Plugin/LibraryClassCheck
> +    "LibraryClassCheck": {
> +        "IgnoreHeaderFile": []
> +    },
> +
> +    ## options defined .pytool/Plugin/SpellCheck
> +    "SpellCheck": {
> +        "AuditOnly": False,           # Fails right now with over 270 errors
> +        "IgnoreFiles": [],           # use gitignore syntax to ignore errors in matching files
> +        "ExtendWords": [
> +            "setjump",
> +            "plong",
> +            "lparam",
> +            "lpdword",
> +            "lpthread",
> +            "lresult",
> +            "bootable",
> +            "bsymbolic",
> +            "endiannness",
> +            "fvmain",
> +            "multiboot",
> +            "qemu's",
> +            "ramdisk",
> +            "ramfb",
> +            "unbootable",
> +            "virt's",
> +            "werror",
> +            "xenio"
> +        ],           # words to extend to the dictionary for this package
> +        "IgnoreStandardPaths": [],   # Standard Plugin defined paths that should be ignore
> +        "AdditionalIncludePaths": [] # Additional paths to spell check (wildcards supported)
> +    }
> +}
> diff --git a/ArmVirtPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml b/ArmVirtPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
> new file mode 100644
> index 000000000000..b9452ec5bfaf
> --- /dev/null
> +++ b/ArmVirtPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
> @@ -0,0 +1,89 @@
> +## @file
> +# Azure Pipeline build file for building a platform.
> +#
> +# Platform: ArmVirtQemu
> +# OS: Ubuntu
> +# Toolchain: GCC5
> +#
> +# Copyright (c) Microsoft Corporation.
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +trigger:
> +  - master
> +pr:
> +  - master
> +
> +jobs:
> +  - job: Platform_CI
> +    variables:
> +      package: 'ArmVirtPkg'
> +      vm_image: 'ubuntu-latest'
> +      should_run: true
> +      run_flags: "MAKE_STARTUP_NSH=TRUE QEMU_HEADLESS=TRUE"
> +
> +    #Use matrix to speed up the build process
> +    strategy:
> +        matrix:
> +          QEMU_AARCH64_DEBUG:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "AARCH64"
> +            Build.Flags: ""
> +            Build.Target: "DEBUG"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +          QEMU_AARCH64_RELEASE:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "AARCH64"
> +            Build.Flags: ""
> +            Build.Target: "RELEASE"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +          QEMU_AARCH64_NOOPT:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "AARCH64"
> +            Build.Flags: ""
> +            Build.Target: "NOOPT"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +          QEMU_ARM_DEBUG:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "ARM"
> +            Build.Flags: ""
> +            Build.Target: "DEBUG"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +          QEMU_ARM_RELEASE:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "ARM"
> +            Build.Flags: ""
> +            Build.Target: "RELEASE"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +          QEMU_ARM_NOOPT:
> +            Build.File: "$(package)/PlatformCI/PlatformBuild.py"
> +            Build.Arch: "ARM"
> +            Build.Flags: ""
> +            Build.Target: "NOOPT"
> +            Run.Flags: $(run_flags)
> +            Run: $(should_run)
> +
> +    workspace:
> +      clean: all
> +
> +    pool:
> +      vmImage: $(vm_image)
> +
> +    steps:
> +    - template: ../../../.azurepipelines/templates/platform-build-run-steps.yml
> +      parameters:
> +        tool_chain_tag: GCC5
> +        build_pkg: $(package)
> +        build_target: $(Build.Target)
> +        build_arch: $(Build.Arch)
> +        build_file: $(Build.File)
> +        build_flags: $(Build.Flags)
> +        run_flags: $(Run.Flags)
> +        extra_install_step:
> +        - bash: sudo apt-get install qemu
> +          displayName: Install qemu
> +          condition: and(gt(variables.pkg_count, 0), succeeded())
> diff --git a/ArmVirtPkg/PlatformCI/PlatformBuild.py b/ArmVirtPkg/PlatformCI/PlatformBuild.py
> new file mode 100644
> index 000000000000..dff653e919eb
> --- /dev/null
> +++ b/ArmVirtPkg/PlatformCI/PlatformBuild.py
> @@ -0,0 +1,276 @@
> +# @file
> +# Script to Build ArmVirtPkg UEFI firmware
> +#
> +# Copyright (c) Microsoft Corporation.
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +import os
> +import logging
> +import io
> +
> +from edk2toolext.environment import shell_environment
> +from edk2toolext.environment.uefi_build import UefiBuilder
> +from edk2toolext.invocables.edk2_platform_build import BuildSettingsManager
> +from edk2toolext.invocables.edk2_setup import SetupSettingsManager, RequiredSubmodule
> +from edk2toolext.invocables.edk2_update import UpdateSettingsManager
> +from edk2toolext.invocables.edk2_pr_eval import PrEvalSettingsManager
> +from edk2toollib.utility_functions import RunCmd
> +from edk2toollib.utility_functions import GetHostInfo
> +
> +# ####################################################################################### #
> +#                                Common Configuration                                     #
> +# ####################################################################################### #
> +
> +
> +class CommonPlatform():
> +    ''' Common settings for this platform.  Define static data here and use
> +        for the different parts of stuart
> +    '''
> +    PackagesSupported = ("ArmVirtPkg",)
> +    ArchSupported = ("AARCH64", "ARM")
> +    TargetsSupported = ("DEBUG", "RELEASE", "NOOPT")
> +    Scopes = ('armvirt', 'edk2-build')
> +    WorkspaceRoot = os.path.realpath(os.path.join(
> +        os.path.dirname(os.path.abspath(__file__)), "..", ".."))
> +
> +    # ####################################################################################### #
> +    #                         Configuration for Update & Setup                                #
> +    # ####################################################################################### #
> +
> +
> +class SettingsManager(UpdateSettingsManager, SetupSettingsManager, PrEvalSettingsManager):
> +
> +    def GetPackagesSupported(self):
> +        ''' return iterable of edk2 packages supported by this build.
> +        These should be edk2 workspace relative paths '''
> +        return CommonPlatform.PackagesSupported
> +
> +    def GetArchitecturesSupported(self):
> +        ''' return iterable of edk2 architectures supported by this build '''
> +        return CommonPlatform.ArchSupported
> +
> +    def GetTargetsSupported(self):
> +        ''' return iterable of edk2 target tags supported by this build '''
> +        return CommonPlatform.TargetsSupported
> +
> +    def GetRequiredSubmodules(self):
> +        ''' return iterable containing RequiredSubmodule objects.
> +        If no RequiredSubmodules return an empty iterable
> +        '''
> +        rs = []
> +
> +        # intentionally declare this one with recursive false to avoid overhead
> +        rs.append(RequiredSubmodule(
> +            "CryptoPkg/Library/OpensslLib/openssl", False))
> +
> +        # To avoid maintenance of this file for every new submodule
> +        # lets just parse the .gitmodules and add each if not already in list.
> +        # The GetRequiredSubmodules is designed to allow a build to optimize
> +        # the desired submodules but it isn't necessary for this repository.
> +        result = io.StringIO()
> +        ret = RunCmd("git", "config --file .gitmodules --get-regexp path", workingdir=self.GetWorkspaceRoot(), outstream=result)
> +        # Cmd output is expected to look like:
> +        # submodule.CryptoPkg/Library/OpensslLib/openssl.path CryptoPkg/Library/OpensslLib/openssl
> +        # submodule.SoftFloat.path ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3
> +        if ret == 0:
> +            for line in result.getvalue().splitlines():
> +                _, _, path = line.partition(" ")
> +                if path is not None:
> +                    if path not in [x.path for x in rs]:
> +                        rs.append(RequiredSubmodule(path, True)) # add it with recursive since we don't know
> +        return rs
> +
> +    def SetArchitectures(self, list_of_requested_architectures):
> +        ''' Confirm the requests architecture list is valid and configure SettingsManager
> +        to run only the requested architectures.
> +
> +        Raise Exception if a list_of_requested_architectures is not supported
> +        '''
> +        unsupported = set(list_of_requested_architectures) - \
> +            set(self.GetArchitecturesSupported())
> +        if(len(unsupported) > 0):
> +            errorString = (
> +                "Unsupported Architecture Requested: " + " ".join(unsupported))
> +            logging.critical(errorString)
> +            raise Exception(errorString)
> +        self.ActualArchitectures = list_of_requested_architectures
> +
> +    def GetWorkspaceRoot(self):
> +        ''' get WorkspacePath '''
> +        return CommonPlatform.WorkspaceRoot
> +
> +    def GetActiveScopes(self):
> +        ''' return tuple containing scopes that should be active for this process '''
> +
> +        scopes = CommonPlatform.Scopes
> +        ActualToolChainTag = shell_environment.GetBuildVars().GetValue("TOOL_CHAIN_TAG", "")
> +
> +        if GetHostInfo().os.upper() == "LINUX" and ActualToolChainTag.upper().startswith("GCC"):
> +            if "AARCH64" in self.ActualArchitectures:
> +                scopes += ("gcc_aarch64_linux",)
> +            if "ARM" in self.ActualArchitectures:
> +                scopes += ("gcc_arm_linux",)
> +        return scopes
> +
> +    def FilterPackagesToTest(self, changedFilesList: list, potentialPackagesList: list) -> list:
> +        ''' Filter other cases that this package should be built
> +        based on changed files. This should cover things that can't
> +        be detected as dependencies. '''
> +        build_these_packages = []
> +        possible_packages = potentialPackagesList.copy()
> +        for f in changedFilesList:
> +            # BaseTools files that might change the build
> +            if "BaseTools" in f:
> +                if os.path.splitext(f) not in [".txt", ".md"]:
> +                    build_these_packages = possible_packages
> +                    break
> +
> +            # if the azure pipeline platform template file changed
> +            if "platform-build-run-steps.yml" in f:
> +                build_these_packages = possible_packages
> +                break
> +
> +
> +        return build_these_packages
> +
> +    def GetPlatformDscAndConfig(self) -> tuple:
> +        ''' If a platform desires to provide its DSC then Policy 4 will evaluate if
> +        any of the changes will be built in the dsc.
> +
> +        The tuple should be (<workspace relative path to dsc file>, <input dictionary of dsc key value pairs>)
> +        '''
> +        return (os.path.join("ArmVirtPkg", "ArmVirtQemu.dsc"), {})
> +
> +
> +    # ####################################################################################### #
> +    #                         Actual Configuration for Platform Build                         #
> +    # ####################################################################################### #
> +
> +
> +class PlatformBuilder(UefiBuilder, BuildSettingsManager):
> +    def __init__(self):
> +        UefiBuilder.__init__(self)
> +
> +    def AddCommandLineOptions(self, parserObj):
> +        ''' Add command line options to the argparser '''
> +        parserObj.add_argument('-a', "--arch", dest="build_arch", type=str, default="AARCH64",
> +                               help="Optional - Architecture to build.  Default = AARCH64")
> +
> +    def RetrieveCommandLineOptions(self, args):
> +        '''  Retrieve command line options from the argparser '''
> +
> +        shell_environment.GetBuildVars().SetValue(
> +            "TARGET_ARCH", args.build_arch.upper(), "From CmdLine")
> +
> +        shell_environment.GetBuildVars().SetValue(
> +            "ACTIVE_PLATFORM", "ArmVirtPkg/ArmVirtQemu.dsc", "From CmdLine")
> +
> +    def GetWorkspaceRoot(self):
> +        ''' get WorkspacePath '''
> +        return CommonPlatform.WorkspaceRoot
> +
> +    def GetPackagesPath(self):
> +        ''' Return a list of workspace relative paths that should be mapped as edk2 PackagesPath '''
> +        return ()
> +
> +    def GetActiveScopes(self):
> +        ''' return tuple containing scopes that should be active for this process '''
> +        scopes = CommonPlatform.Scopes
> +        ActualToolChainTag = shell_environment.GetBuildVars().GetValue("TOOL_CHAIN_TAG", "")
> +        Arch = shell_environment.GetBuildVars().GetValue("TARGET_ARCH", "")
> +
> +        if GetHostInfo().os.upper() == "LINUX" and ActualToolChainTag.upper().startswith("GCC"):
> +            if "AARCH64" == Arch:
> +                scopes += ("gcc_aarch64_linux",)
> +            elif "ARM" == Arch:
> +                scopes += ("gcc_arm_linux",)
> +        return scopes
> +
> +    def GetName(self):
> +        ''' Get the name of the repo, platform, or product being build '''
> +        ''' Used for naming the log file, among others '''
> +        # check the startup nsh flag and if set then rename the log file.
> +        # this helps in CI so we don't overwrite the build log since running
> +        # uses the stuart_build command.
> +        if(shell_environment.GetBuildVars().GetValue("MAKE_STARTUP_NSH", "FALSE") == "TRUE"):
> +            return "ArmVirtPkg_With_Run"
> +        return "ArmVirtPkg"
> +
> +    def GetLoggingLevel(self, loggerType):
> +        ''' Get the logging level for a given type
> +        base == lowest logging level supported
> +        con  == Screen logging
> +        txt  == plain text file logging
> +        md   == markdown file logging
> +        '''
> +        return logging.DEBUG
> +
> +    def SetPlatformEnv(self):
> +        logging.debug("PlatformBuilder SetPlatformEnv")
> +        self.env.SetValue("PRODUCT_NAME", "ArmVirtQemu", "Platform Hardcoded")
> +        self.env.SetValue("MAKE_STARTUP_NSH", "FALSE", "Default to false")
> +        self.env.SetValue("QEMU_HEADLESS", "FALSE", "Default to false")
> +        return 0
> +
> +    def PlatformPreBuild(self):
> +        return 0
> +
> +    def PlatformPostBuild(self):
> +        return 0
> +
> +    def FlashRomImage(self):
> +        VirtualDrive = os.path.join(self.env.GetValue(
> +            "BUILD_OUTPUT_BASE"), "VirtualDrive")
> +        os.makedirs(VirtualDrive, exist_ok=True)
> +        OutputPath_FV = os.path.join(
> +            self.env.GetValue("BUILD_OUTPUT_BASE"), "FV")
> +        Built_FV = os.path.join(OutputPath_FV, "QEMU_EFI.fd")
> +
> +        # pad fd to 64mb
> +        with open(Built_FV, "ab") as fvfile:
> +            fvfile.seek(0, os.SEEK_END)
> +            additional = b'\0' * ((64 * 1024 * 1024)-fvfile.tell())
> +            fvfile.write(additional)
> +
> +        # QEMU must be on that path
> +
> +        # Unique Command and Args parameters per ARCH
> +        if (self.env.GetValue("TARGET_ARCH").upper() == "AARCH64"):
> +            cmd = "qemu-system-aarch64"
> +            args = "-M virt"
> +            args += " -cpu cortex-a57"                                          # emulate cpu
> +        elif(self.env.GetValue("TARGET_ARCH").upper() == "ARM"):
> +            cmd = "qemu-system-arm"
> +            args = "-M virt"
> +            args += " -cpu cortex-a15"                                          # emulate cpu
> +        else:
> +            raise NotImplementedError()
> +
> +        # Common Args
> +        args += " -pflash " + Built_FV                                     # path to fw
> +        args += " -m 1024"                                                  # 1gb memory
> +        # turn off network
> +        args += " -net none"
> +        # Serial messages out
> +        args += " -serial stdio"
> +        # Mount disk with startup.nsh
> +        args += f" -drive file=fat:rw:{VirtualDrive},format=raw,media=disk"
> +
> +        # Conditional Args
> +        if (self.env.GetValue("QEMU_HEADLESS").upper() == "TRUE"):
> +            args += " -display none"  # no graphics
> +
> +        if (self.env.GetValue("MAKE_STARTUP_NSH").upper() == "TRUE"):
> +            f = open(os.path.join(VirtualDrive, "startup.nsh"), "w")
> +            f.write("BOOT SUCCESS !!! \n")
> +            # add commands here
> +            f.write("reset -s\n")
> +            f.close()
> +
> +        ret = RunCmd(cmd, args)
> +
> +        if ret == 0xc0000005:
> +            # for some reason getting a c0000005 on successful return
> +            return 0
> +
> +        return ret
> diff --git a/ArmVirtPkg/PlatformCI/ReadMe.md b/ArmVirtPkg/PlatformCI/ReadMe.md
> new file mode 100644
> index 000000000000..7c11d925f59e
> --- /dev/null
> +++ b/ArmVirtPkg/PlatformCI/ReadMe.md
> @@ -0,0 +1,125 @@
> +# ArmVirtPkg - Platform CI
> +
> +This Readme.md describes the Azure DevOps based Platform CI for ArmVirtPkg and how
> +to use the same Pytools based build infrastructure locally.
> +
> +## Supported Configuration Details
> +
> +This solution for building and running ArmVirtPkg has only been validated with Ubuntu
> +18.04 and the GCC5 toolchain. Two different firmware builds are supported and are
> +described below.
> +
> +| Configuration name      | Architecture       | DSC File         |Additional Flags |
> +| :----------             | :-----             | :-----           | :----           |
> +| AARCH64                 | AARCH64            | ArmVirtQemu.dsc  | None            |
> +| ARM                     | ARM                | ArmVirtQemu.dsc  | None            |
> +
> +## EDK2 Developer environment
> +
> +- [Python 3.8.x - Download & Install](https://www.python.org/downloads/)
> +- [GIT - Download & Install](https://git-scm.com/download/)
> +- [QEMU - Download, Install, and add to your path](https://www.qemu.org/download/)
> +- [Edk2 Source](https://github.com/tianocore/edk2)
> +- Additional packages found necessary for Ubuntu 18.04
> +  - apt-get install gcc g++ make uuid-dev
> +
> +Note: edksetup, Submodule initialization and manual installation of NASM, iASL, or
> +the required cross-compiler toolchains are **not** required, this is handled by the
> +Pytools build system.
> +
> +## Building with Pytools for ArmVirtPkg
> +
> +1. [Optional] Create a Python Virtual Environment - generally once per workspace
> +
> +    ``` bash
> +    python -m venv <name of virtual environment>
> +    ```
> +
> +2. [Optional] Activate Virtual Environment - each time new shell opened
> +    - Windows
> +
> +      ``` bash
> +      <name of virtual environment>/Scripts/activate.bat
> +      ```
> +
> +    - Linux
> +
> +      ```bash
> +      source <name of virtual environment>/bin/activate
> +      ```
> +
> +3. Install Pytools - generally once per virtual env or whenever pip-requirements.txt changes
> +
> +    ``` bash
> +    pip install --upgrade -r pip-requirements.txt
> +    ```
> +
> +4. Initialize & Update Submodules - only when submodules updated
> +
> +    ``` bash
> +    stuart_setup -c ArmVirtPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
> +    ```
> +
> +5. Initialize & Update Dependencies - only as needed when ext_deps change
> +
> +    ``` bash
> +    stuart_update -c ArmVirtPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
> +    ```
> +
> +6. Compile the basetools if necessary - only when basetools C source files change
> +
> +    ``` bash
> +    python BaseTools/Edk2ToolsBuild.py -t <ToolChainTag>
> +    ```
> +
> +7. Compile Firmware
> +
> +    ``` bash
> +    stuart_build -c ArmVirtPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH>
> +    ```
> +
> +    - use `stuart_build -c ArmVirtPkg/PlatformCI/PlatformBuild.py -h` option to see additional
> +    options like `--clean`
> +
> +8. Running Emulator
> +    - You can add `--FlashRom` to the end of your build command and the emulator will run after the
> +    build is complete.
> +    - or use the `--FlashOnly` feature to just run the emulator.
> +
> +      ``` bash
> +      stuart_build -c ArmVirtPkg/PlatformCI/PlatformBuild.py TOOL_CHAIN_TAG=<TOOL_CHAIN_TAG> -a <TARGET_ARCH> --FlashOnly
> +      ```
> +
> +### Notes
> +
> +1. Including the expected build architecture and toolchain to the _stuart_update_ command is critical.
> +   This is because there are extra scopes and tools that will be resolved during the update step that
> +   need to match your build step.
> +2. Configuring *ACTIVE_PLATFORM* and *TARGET_ARCH* in Conf/target.txt is **not** required. This
> +   environment is set by PlatformBuild.py based upon the `[-a <TARGET_ARCH>]` parameter.
> +3. QEMU must be on your path.  On Windows this is a manual process and not part of the QEMU installer.
> +
> +**NOTE:** Logging the execution output will be in the normal stuart log as well as to your console.
> +
> +### Custom Build Options
> +
> +**MAKE_STARTUP_NSH=TRUE** will output a *startup.nsh* file to the location mapped as fs0. This is
> +used in CI in combination with the `--FlashOnly` feature to run QEMU to the UEFI shell and then execute
> +the contents of *startup.nsh*.
> +
> +**QEMU_HEADLESS=TRUE** Since CI servers run headless QEMU must be told to run with no display otherwise
> +an error occurs. Locally you don't need to set this.
> +
> +### Passing Build Defines
> +
> +To pass build defines through _stuart_build_, prepend `BLD_*_`to the define name and pass it on the
> +command-line. _stuart_build_ currently requires values to be assigned, so add an`=1` suffix for bare defines.
> +For example, to enable the TPM2 support, instead of the traditional "-D TPM2_ENABLE=TRUE", the stuart_build
> +command-line would be:
> +
> +`stuart_build -c ArmVirtPkg/PlatformCI/PlatformBuild.py BLD_*_TPM2_ENABLE=TRUE`
> +
> +## References
> +
> +- [Installing and using Pytools](https://github.com/tianocore/edk2-pytool-extensions/blob/master/docs/using.md#installing)
> +- More on [python virtual environments](https://docs.python.org/3/library/venv.html)
> diff --git a/ArmVirtPkg/PlatformCI/iasl_ext_dep.yaml b/ArmVirtPkg/PlatformCI/iasl_ext_dep.yaml
> new file mode 100644
> index 000000000000..8869ed3ecef1
> --- /dev/null
> +++ b/ArmVirtPkg/PlatformCI/iasl_ext_dep.yaml
> @@ -0,0 +1,21 @@
> +## @file
> +# Download iasl executable tool from a nuget.org package
> +# - package contains different binaries based on host
> +# Add the folder with the tool to the path
> +#
> +# This is only downloaded for scope armvirt thus
> +# should have no impact on the asl compiler used by any
> +# other platform build
> +#
> +# Copyright (c) Microsoft Corporation.
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +{
> +  "id": "iasl-armvirt-1",
> +  "scope": "armvirt",
> +  "type": "nuget",
> +  "name": "iasl",
> +  "source": "https://api.nuget.org/v3/index.json",
> +  "version": "20190215.0.0",
> +  "flags": ["set_path", "host_specific"],
> +}
> -- 
> 2.16.3.windows.1
>