topic Re: Using PCIE switch with IMX8MP in windows 10 IoT in i.MX Processors

Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Wed, 11 Oct 2023 07:00:56 GMT

Hi, is it possible to use PCI switch with NXP IMX8MP in windows 10 IoT to expand the PCIE slots??

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Thu, 12 Oct 2023 11:07:31 GMT

I hope you are doing well.

It was only positively tested on some Asus boards with i.MX8MQ, because it is not on our EVKs. With MP it was not tested but it could work.
In MX8M_PLUS_EVK.dsc it is needed to set PcdPcie1SwitchSupport to TRUE.

This is information from R&D.

I hope this answers your query.

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Fri, 13 Oct 2023 09:01:15 GMT

Hi @Dhruvit

Thanks for the reply. I want to know if we can use PI7C9X2G304EV as the PCIE switch to expand the PCIE slot??

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Wed, 18 Oct 2023 05:25:59 GMT

Hi @Ben10,

I hope you are doing well.

Yes, it's possible. We have no experience with the PI7C9X2G304EV switch, but PI7C9X2G404SVA switch works for us.

To enable the PCIe switch, use the parameter "giMX8TokenSpaceGuid.PcdPcie1SwitchSupport|TRUE" from the file: BSP\mu_platform_nxp\NXP\MX8M_EVK\MX8M_EVK.dsc

For other settings, use the files:

BSP\mu_platform_nxp\NXP\MX8M_EVK\AcpiTables\Dsdt-PCIe.asl
BSP\mu_platform_nxp\Silicon\ARM\NXP\iMX8Pkg\AcpiTables\Mcfg.aslc

or document PCI Firmware Specification Revision x.x

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Wed, 18 Oct 2023 10:48:07 GMT

Hi @Dhruvit

Thanks for the reply

Can you please tell me in which board PI7C9X2G404SVA PCIE switch was used??

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Wed, 25 Oct 2023 08:30:35 GMT

Hi @Ben10,

PI7C9X2G404SVA PCIE switch was used with the customer board using i.MX8M Quad Processor.

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Wed, 25 Oct 2023 09:14:15 GMT

Hi @Dhruvit

Thanks for the reply.

Other than the changes that you have mentioned above, is there anything else that we need to do related to pcie switch?? Because now the PCIe switch can be seen in the device manager, but even after that when I connect a PCI card (AW-CM276MA-PUR) in the PCIe slot, it is not detected.

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Mon, 30 Oct 2023 09:59:48 GMT

Hi @Ben10,

I hope you are doing well.

Please make sure that you have checked the correctness of the power-down signal (pin 56) on the WiFi module. It could be holding the module in the off state.

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Wed, 01 Nov 2023 09:32:06 GMT

Hi @Dhruvit

Thanks for the reply

I have checked the pin that you have mentioned and it is not holding the WiFi module in the power off state.

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Mon, 20 Nov 2023 05:32:09 GMT

Hi @Ben10,

With the information we have available about the device, we are probably not able to advise better. Would it be possible to share a schematic of the board?

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Wed, 22 Nov 2023 08:51:22 GMT

Hi @Dhruvit

Unfortunately I won't be able to provide you with the schematics. But if you want I can tell how the PCIE phy pins are connected with the PCIE M.2 slot.

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Dhruvit — Wed, 22 Nov 2023 09:18:43 GMT

Hi @Ben10,

Please provide the information about the connection that you can share.

Thanks & Regards,
Dhruvit Vasavada

Re: Using PCIE switch with IMX8MP in windows 10 IoT

Ben10 — Fri, 12 Jan 2024 08:39:40 GMT

Hi @Dhruvit

Thanks for the reply

We enabled UEFI log and PCIe driver log and got the following log while booting "ASSERT [iMX8PciExpress] /home/win10-iot-bsp/mu_platform_nxp/Silicon/ARM/NXP/iMX8Pkg/Drivers/PciExpress/iMX8PciExpress.c(1375): BridgeMemoryBase != ResourceAddress" and the board didn't boot." So, what does this mean?

But the board boots successfully when the UEFI debug is disabled in the firmware.