DRA829VXEVM: DRA829VXEVM PCIe Backplane: How to setup host (NTB)

Zeming Zhang

Prodigy 70 points

Part Number: DRA829VXEVM
Other Parts Discussed in Thread: DRA829V

Our PCIe Backplane looks like it is workoing.

But we have one question, does Host side chip must support NTB for Backplane ?

for example:

DRA829VXEVM setted to EP with Backplane.

we have two RC connect to DRA829VXEVM , so does my RC must has NTB support for Backplane ?

Thank you

over 5 years ago

0 Zeming Zhang over 5 years ago

Prodigy 70 points

my RC chip doesn't support NTB, so does our RC can use Backplane ?

0 Dave Bell over 5 years ago in reply to Zeming Zhang

TI__Genius 14680 points

Zeming,

Please take a look at http://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/latest/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/PCIe/PCIe_Backplane.html#pcie-backplane and see if this is helpful.

>>>

PCIe uses NTB (non transparent bridge) for two hosts to communicate with each other. Though J721E doesn’t have an explicit NTB controller, NTB functionality can be achieved using multiple endpoint controller instances. And for PCIe backplane (to connect more than 2 hosts), aggregation of NTB controllers can be modeled using multiple instances of multi-function endpoint controller.

<<<

The NTB function is implemented within the DRA829V. There are host driver requirements to communicate to/through the NTB.

Best regards,

Dave

0 Zeming Zhang over 5 years ago in reply to Dave Bell

Prodigy 70 points

Thank you for your answer.

DRA829V working as EP point in my project.

I want to two use Qcom chip connect to DRA829V as host.

Do we need implement NTB(ntb_hw_epf) in Qcom chip for Backplane ?

0 Dave Bell over 5 years ago in reply to Zeming Zhang

TI__Genius 14680 points

Zeming,

Yes, you would follow the same "RC Side Configurations" as outlined in the multi-DRA829V setup.

Best regards,

Dave

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DRA829VXEVM: DRA829VXEVM PCIe Backplane: How to setup host (NTB)