Also see the Gateworks generic PCI wiki page: PCI

Catalina i.MX95 PCIe Support

The i.MX95 SoC has two PCIe Gen 3 single lane host controllers with a TLP size of 256B.

For performance information see ​here

GW9200

The GW9200 does not require a PCIe switch for the FSA sites which offers great power and thermal savings.

GW9400

The GW9400 has 4 FSA sites, and thus needs some PCIe switches / hubs to feed PCIe to all of these sites.

The architecture is that the two PCIe channels coming from the i.MX95 each recieve a 1:2 switch (Microchip PCI12000C-I/ZUX)

PCIe channel 1 goes to FSA 1 and 2 PCIe channel 2 goes to FSA 3 and 4

For orders of 100 pieces or more, the PCIe switches can be unloaded if PCIe is not needed on the FSA sites.

PCIe Reset

Reset signals are routed to FSA adapters supporting PCIe. The PERST# signal is a GPIO that is specified in the device-tree and automatically controlled by the driver.