topic How to set PCIe EP's memory address? in i.MX Processors

How to set PCIe EP's memory address?

t_kuha — Fri, 05 Jan 2018 01:10:47 GMT

Hi, I have a question about how to change a PCIe device's memory address on i.MX6.

Now, I have a PCIe EP device connected to i.MX6 Quad (running Linux 3.14.52) and issuing lspci command shows the following values for the device:

Memory at 01100000 (32-bit, non-prefetchable) [size=1M]
Memory at 01200000 (32-bit, non-prefetchable) [size=1M]

The question is how can I change these values (01100000/01200000)?

Should I modify device tree or Linux kernel's source code?

Regards,

Re: How to set PCIe EP's memory address?

igorpadykov — Fri, 05 Jan 2018 10:50:34 GMT

Hi t_kuha

please check PCI EP examples (0001-ENGR00268112-pcie-emaluate-the-pcie-ep-as-ram-device.patch.zip) on

i.MX6Q PCIe EP/RC Validation System

for latest kernels one can look at sect.40.4 Using PCIe Endpoint and Running Tests attached Linux Manual

Best regards
igor
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Re: How to set PCIe EP's memory address?

t_kuha — Fri, 26 Jan 2018 01:48:55 GMT

igor,

Thank you for the reply.

I could change the addresses by modifying device tree.

Regards,