Usb; Pci Express; Table 4-2 Initialization Parameters - SMART Embedded Computing COMX-P2020 Installation And Use Manual

U-boot will use the following parameters to initialize the UARTs:
Table 4-2
Parameter
Baud rate
Data bit
Parity
Stop bit
CCB Clock
Divisor most and least significant byte registers
Internal interrupt number
4.12

USB

P2020 implements a dual-role (DR) USB module. This module is connected to USB2514i
which can provide 4 downstream ports. The DR module can act as a device or host
controller, while in this case, it is configured as a host controller, and it can support at most
six bidirectional USB endpoints.
4.13

PCI Express

There are three PCI Express on COMX-P2020. The PCI Express are configured as:

PCI Express 1 x1 (2.5 Gbps) SerDes lane 0
 PCI Express 2 x1 (2.5 Gbps) > SerDes lane 1
 PCI Express 3 x2 (2.5 Gbps) SerDes lanes 2-3
 PCI Express 1 is connected to GPU Z11M. The other two are connected to the
carrier board
COMX-P2020 Module Installation and Use (6806800K97F)
Initialization Parameters
Functional Description
Value
115200
8
None
1
400 MHz
CCB Clock / Baud rate / 16 = 326
26
77