[ipxe-devel] How iPXE detect PCI version?

[Gelip]

I know that while PC boot from iPXE ROM this displays PCI version like this:
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iPXE (http://ipxe.org) 00:04.0 C100 PCI2.10 PnP...
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This means that PCI version is PCI2.1 right? How iPXE check this?
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