Need help with configuring the UPHY to access all USB 3.0 and Minicard On C7(UPHY2-lane0) and Ethernet (UPHY2-lane6)

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
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Hello,

I’m working with the Osbourn board using the Orin AGX 32G and have encountered some unexpected behavior related to UPHY configuration. I’m using the latest NVIDIA SDK (Jetpack 6.2, L4T 36.4.3) and referencing the Jetson AGX Orin Design Guide v1.7 (DG-10653-001) for PHY configurations.

UPHY0:

  • The USB3.2 (P0) port on lan0 only functions as USB 2.0. I have configured it using Configuration #1 from the design guide, which should enable USB 3.0.

  • File: p3701.conf.common:

Configuration Used: ODMDATA="gbe-uphy-config-22,hsstp-lane-map-3,nvhs-uphy-config-0,hsio-uphy-config-0,gbe0-enable-10g";

download
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 Above is the table from the Jetson-AGX-Orin-Design-Guide_DG-10653-001v1.7

UPHY1:

No issues observed.

UPHY3:

I tested both the MGBE interface (Lane #6) and Minicard (PCIe via Lane #0), and both work simultaneously. While this is great, it’s unexpected based on the restrictions outlined in the v1.7 Design Guide, where this combination shouldn’t be valid.

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 Above is the table from Jetson-AGX-Orin-Design-Guide_DG-10653-001v1.7

Interestingly, this behavior aligns with an older version of the design guide (v0.2 – Jetson_AGX_Orin_Design_Guide_DG-10653-001_v0.2), which allowed per-PHY configuration and supports the scenario I’m seeing.

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download (2)784×868 102 KB

Above is that table from Jetson-AGX-Orin-Design-Guide_DG-10653-001v0.2
Note: v0.2

Queries:

  1. Why does the latest SDK (Jetpack 6.2) seem to follow the behavior defined in the older v0.2 guide, rather than adhering to the latest v1.7 guide?

  2. If this per-PHY configuration behavior is intentionally supported in the latest SDK, can I:

    • Enable all three USB ports with USB 3.0 support, and

    • Continue using the current UPHY2 configuration (MGBE on C0 and PCIe Minicard on C7)?

Please let me know if any additional information is required. I appreciate your insights and support on this. Thank you.

Regards,

Brijesh Thakkar

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I am not sure what is that table v0.2 you are sharing . For example, Orin AGX does not have C6 PCIe enabled at all.
Are you sure you read the correct document for Jetson Orin? What link are you using to get that documentation? This kind of document has obvious mistake that should be removed.

Please be aware that what you are doing now have been validated by many other users for like 2~3 years. The default behavior won’t be wrong.

You should read adaptation guide for modifying the device tree for PCIe and USB.

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