VF Base Address Register 4 @0x234
This is part of the set of six Virtual Function Base Address Registers defined by the SR-IOV Specifications. These registers are used to define address ranges for memory accesses to the Endpoint device. This register may be used to define a range of 32-bit addresses, or paired with the next adjacent register to define a 64-bit address range. During the initial configuration of the device, the configuration program determines the size of the address range defined by the BAR by writing a pattern of all 1's into the BAR, reading back from the BAR, and noting the position of the first 1 (the most significant) in the returned value. A value of 0 is returned by the Controller if this BAR is not configured. Otherwise, the number of 1's returned is based on the length of the BAR.
| Bits | SW | Name | Description | Reset |
|---|---|---|---|---|
| 31:0 | R | Reserved [R7] | This field is reserved at power-on. This can be changed using BAR configuration register in LM space. | 0x0 |