How to enable pcie C7 in Jetpack5.1.2_R35.4.1

[848145724]

Dear all:
how to eanble pcie c7 in Jetpack5.1.2_R35.4.1 for Jetson Orin NX.
Best Regards.

[WayneWWW]

Don’t know how to answer you because C7 is enabled in default software… no need extra steps to enable it.

[848145724]

C7 is pcie@141e0000 ?

[WayneWWW]

You can check the document.

https://docs.nvidia.com/jetson/archives/r35.4.1/DeveloperGuide/text/HR/JetsonModuleAdaptationAndBringUp/JetsonOrinNxNanoSeries.html

[848145724]

In fact, pcie@141e0000 is disabled for Jetson Orin nx.

[WayneWWW]

That is because you are using p3509 dtb… p3509 does not have corresponding pcie interface for C7…

If you are using the orin nano devkit dtb, then it will have C7 enabled…

root@tegra-ubuntu:/home/nvidia# dmesg |grep 141e000
[    6.293503] tegra194-pcie 141e0000.pcie: Adding to iommu group 9
[    6.305622] tegra194-pcie 141e0000.pcie: Using GICv2m MSI allocator
[    9.205892] tegra194-pcie 141e0000.pcie: Using GICv2m MSI allocator
[    9.213806] tegra194-pcie 141e0000.pcie: host bridge /pcie@141e0000 ranges:
[    9.220984] tegra194-pcie 141e0000.pcie:       IO 0x003e100000..0x003e1fffff -> 0x003e100000
[    9.229679] tegra194-pcie 141e0000.pcie:      MEM 0x3228000000..0x322fffffff -> 0x0040000000
[    9.238365] tegra194-pcie 141e0000.pcie:      MEM 0x2e40000000..0x3227ffffff -> 0x2e40000000
[    9.354607] tegra194-pcie 141e0000.pcie: Link up
[    9.360037] tegra194-pcie 141e0000.pcie: PCI host bridge to bus 0007:00
root@tegra-ubuntu:/home/nvidia# 
root@tegra-ubuntu:/home/nvidia# 
root@tegra-ubuntu:/home/nvidia# dmesg |grep dts
[    0.002865] DTS File Name: /dvs/git/dirty/git-master_linux/kernel/kernel-5.10/arch/arm64/boot/dts/../../../../../../hardware/nvidia/platform/t23x/p3768/kernel-dts/tegra234-p3767-0000-p3768-0000-a0.dts

[848145724]

Do you means C7 can not be used for p3767-0000-p3509?
Does C9 can be enabled in Orin NX for p3767-0000-p3509?

[WayneWWW]

其實這沒有什麼能不能用的問題… p3509是我們xavier nx的devkit. 上面沒有對應的硬體for PCIe C7…
所以我們不會沒事把這個dtb上面的C7打開…

如果你的板子是自己做的, 然後有對應的C7 硬體, 那3509對你而言不過就是個名字… 他的內容你想怎樣改就怎樣改…

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There is no standard “it can do or cannot do”… P3509 is Xavier NX devkit and that devkit does not have hardware for PCIe C7…
So we won’t enable C7 controller in this dtb with no reason…

If you made your own carrier board which has C7, then the p3509 board name does not matter to you. You can modify the content to whatever you want.

[848145724]

The board is our custom board.
So, how to enable this pcie ?

[WayneWWW]

You can refer to how the device tree written in p3768 dtb…

[848145724]

I add this refer p3768, pcie now is work.

Thank you very much. Best regards.