PCIe interface

PCIe registers

These registers sits on PCI Bar 0 and is related to the PCIe to S2 SoC interface (probably from Broadcom). They relate to PLL settings and power/link states.

0:0xd000

Possibly used to set the PCIe link state.

• Written values: 0x10 (L1 state?)

0:0xd120

• Written values: 0x1804

0:0xd124

Possibly information on PLL power state.

• Written values: 0xac5800
• Compared values: 0xac5800

0:0xd128

• Written values: 0x1f08, 0x1608, 0x1708

0:0xd12c

• Written values: 0x800005bf, 0x80008610, 0x8000fc00

Logic

• Put PCIe link into L1 state
• Turn off PLL
• Check if PLL actually turned off (fail if not)
• Do initialization sequence on 0xd128 and 0x12c