Where we find the PCIe capability register (0x10), a next pointer (0x00, end of chain) and some metadata (0x0042 ref 7.
It is intended that this document be used along with the PCI Express Base.
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Does this always have 0x10 (the capability code for PCI-E) if the card is PCI-E on a hardware level or only if the functions added to PCI-E compared to PCI are being used from a software perspective? I have found hardware, using lspci -xxxx, that has an extended.