Fix ConfigEditor Linux compatibility: add platform-aware SMBIOS access

[Copilot]

ConfigEditor fails on Linux due to Windows-specific SMBIOS code using ctypes.windll.kernel32, which doesn't exist on non-Windows platforms.

Changes

BoardMiscInfo.py

• Add platform detection to route SMBIOS access appropriately
• Windows: Use existing GetSystemFirmwareTable via kernel32.dll
• Linux: Read from /sys/firmware/dmi/tables/DMI
• Handle platform-specific data format differences (Windows prepends 8-byte header)
• Wrap all SMBIOS calls in try-except to fail gracefully without permissions

ConfigEditor.py

• Add null checks before dereferencing SMBIOS data
• Default Manufacturing_enabled to "Unknown" when SMBIOS unavailable
• Replace magic number 0x13 with SMBIOS_BIOS_CHAR_EXT2_OFFSET constant

BoardMiscInfo_test.py (new)

• Unit tests verifying graceful degradation without SMBIOS access

Example

Before:

def locate_smbios_data():
    kernel32 = ctypes.windll.kernel32  # AttributeError on Linux

After:

def locate_smbios_data():
    if platform.system() == "Windows":
        kernel32 = ctypes.windll.kernel32
        # ... existing Windows code
    elif platform.system() == "Linux":
        with open("/sys/firmware/dmi/tables/DMI", "rb") as f:
            return f.read()

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Bug]: ConfigEditor only runs on windows</issue_title>
<issue_description>### Is there an existing issue for this?

• I have searched existing issues

Current Behavior

https://github.com/microsoft/mu_feature_config/blob/main/SetupDataPkg/Tools/BoardMiscInfo.py#L60

Code has leaked into the ConfigEditor that is windows specific, and ConfigEditor is no longer running on linux due to an error in the available packages.

Expected Behavior

ConfigEditor should be able to run under linux.

Steps To Reproduce

Clone repo under a linux os
install pip requirements
attempt to run configeditor and see import error.

Build Environment

- OS(s): linux
- Tool Chain(s): python3
- Targets Impacted:

Version Information

top of tree

Urgency

Low

Are you going to fix this?

I will fix it

Do you need maintainer feedback?

No maintainer feedback needed

Anything else?

No response</issue_description>

<agent_instructions>SetupDataPkg/Tools/ConfigEditor.py needs to be able to run under both a windows envioronment and a linux based environment.

The Smbios code is causing problems. The smbios code needs reworked to support linux environments, and to be able to fail gracefully in both windows and linux environments</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Bug]: ConfigEditor only runs on windows #511

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