SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
Table 4-58 shows the boot parameter table for PCIe boot. Must be preceded with the common boot parameters described in Table 4-51.
| Byte Offset | Size (bytes) | Name | Default Value | Description |
|---|---|---|---|---|
| 256 | 4 | portNum | From pins | Physical port number |
| 260 | 4 | AddrWid | 64 | PCIe address width |
| 264 | 4 | LinkRate | 8000 | Link rate in MHz |
| 268 | 4 | RefClkkHz | 100000 | Serdes reference clock in kHz |
| 272 | 4 | Nlanes | From pins | Number of PCIe lanes configured (link width) |
| 276 | 4 | Rsvd | 4 | Reserved |
| 280 | 4 | Rsvd | 256 | Reserved |
| 284 | 4 | Rsvd | 256 | Reserved |
| 288 | 4 | Rsvd | 0 | Reserved |
| 292 | 4 | Rsvd | 0 | Reserved |
| 296 | 4 | Vendor ID | 0x104C | PCIe Vendor ID value (read from control registers) |
| 300 | 4 | Device ID | 0xB00D | PCIe Device ID value (read from control registers) |
| 304 | 4 | Class code/revision ID | 0x04800001 | PCIe class code and revision ID value |
| 308 | 4 | Internal Clock | From Pins | If non-zero, internal (SoC) ref clock is used |
| 312 | 4 | sscEnable | 1 | Enable spread spectrum clock |
| 316 | 4 | RefSrc | From Pins | Selects serdes reference clock internal source. Refer to Reference Clock Distribution for details. |