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- Re: iMX8M Plus PCIe DMA Feature
iMX8M Plus PCIe DMA Feature
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iMX8M Plus PCIe DMA Feature
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Hello NXP,
According to the document "AN13164 iMX8MP PCIe Bandwith Analysis", it have the Linux PCI test and test by DMA.
The document "IMX8MPRM- i.MX 8M Plus Applications Processor Reference Manual - Document Number: IMX8MPRM Rev. 1, 06/2021" also show the "Embedded DMA" feature.
Could I write/read PCIe data by DMA ?
Thanks.
Best Regards,
Wayne.
Zhiming_Liu
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Yes, you can use DMA in PCIe
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Hi NXP TechSupport,
The URL pointing to the sample code in the original email trail does not work. Could you post a working one?
I am looking for a working kernel module code that fetches data on a remote device over PCIe bus by using the SDMA. Any related sample code using the Linux kernel PCIe stack and the DMAEngine are very helpful.
Thanks you very much!
dwang2
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Hello NXP,
How could I use the PCIe DMA ?
Could you provide any reference code or document ?
Thanks.
Best Regards,
Wayne.
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Hi Wayne,
The documentation is IMX8MPRM.pdf section 11.4.2.4 DMA Controller.
The reference code is here: https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/pci/controller/dwc/pci-imx6.c?h=im...
Look for the function "imx6_pcie_local_dma_start". That code seems to have been removed from the latest kernel release, but I was able to add it back in and it seems to work. But it doesn't seem to be part of the pci_endpoint_test, so I'm unable to recreate the bandwidth results from AN13164 since NXP didn't describe how to run the benchmark.
