Capabilities Pointer (CAPP) – Offset 34
Capabilities List Pointer
Bit Range | Default | Access | Field Name and Description |
7:0 | 40h | RW/O | Capabilities Pointer (PTR) Indicates that the pointer for the first entry in the capabilities list.
BIOS can determine which capabilities will be exposed by including or removing them from the capability linked list.
As this register is RWO, BIOS must write a value to this register, even if it is to re-write the default value.
Capability Linked List (Default Settings)
Offset | Capability | Next Pointer
40h | PCI Express | 80h
80h | Message Signaled Interrupt (MSI) | 90h
90h | Subsystem Vendor | A0h
A0h | PCI Power Management | 00h
Extended PCIe Capability Linked List
Offset | Capability | Next Pointer
100h | Advanced Error Reporting | 000h
140h | Access Control Services | 000h
200h | L1 Substates | 000h
220h | Secondary PCI Express Capability | 000h
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