PCIe Communication Between 2 Jetson Agx Orin

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
1

Hii,

I’m using Jetson™ Linux version R36.4.3 Latest release. For PCIe communication i’m following below Document.

in the above document provided the PCIe communication between Agx Orin(End Point) linux Pc(Root Port).

Can i get the Procedure for PCIe Communication Between 2 AGX Orin on R36.4.3.

3

Actually the document you are referring to is for Orin AGX and Orin AGX.

4

Yes I tried the following Steps for the PCIe COmmunication.

  1. Flashed the AGX orin with the default set up for root port.
  2. Flashed the another orin by changing the nvhs-uphy-config-1 in the ODMDATD for end point.
  3. Configure the endpoint as per the document while connecting both with pcie cable.
  4. Booted the ROOt port.
  5. when i scan the lspci on root port that didn’t detect the endpoint.
  6. when i trying to run the test cat edmalib_test on end point

root@endpoint-desktop:/sys/kernel/debug/141a0000.pcie-ep_epf_dma_test# cat edmalib_test
cat: edmalib_test: Operation not permitted

5

Most likely due do hardware problem that lspci cannot detect the EP.

Please refer to the design guide of this.

Though its name has Xaiver, it actually compatible with Orin.

1 Like
6

I’m Using 2 Jetson Agx orin Development Kits.

I have a question like should we need to load any driver in the rootPort o detect the end point ?

7

No, the default lspci shall detect that. Only EP side needs to run a driver.

8

thank you,

Should i need to configure anything on the root port side after the booting ?

9

No, RP side is not needed.

10

Can you please confirm me where i’m missing.

11

As I already told, you should read the hardware guide.

The connection you are using between that two Orin might have problem. That is the most common mistake I saw.

12

Thank you WayneWWW

problem with the PCIe communication E3317_A01 RX/TX Swap Board. it was ressolved.

13

I got the successful Log of edma test on endpoint as per the Document.

How to confirm the Data size received on the root port side ?

14

HI,

Is this node coming out on your RP side?

/sys/kernel/debug/0005:01:00.0_pcie_dma_test/

15

yes it is coming.

when i cat dms_size that is 1048576 on RP side

16

do i need to configure to send the data between EP and RP ?
Can you please tell me how to confirm the data transfer between EP and RP

17

I am not quite sure what is the exact thing you want to know here.

So are you able to run this execution?

image
image920×590 53 KB

18

Yes I’m able to run the above execution on EP and I got the kernel log as per the Document.

Can you please tell me How can I confirm the data transfer between EP and RP ?

19

RPLOG.txt (5.9 KB)

20

EPLOG.txt (5.8 KB)

21

We got the kernel log as per the Document but How can I transfer the some 5MB of data between EP and RP. Can you please tell me the any procedure is there with edma.