yocto linux support for second ethernet port on I.MX8 MEK board

[edouard_charvet]

Hello, We want to use the second ethernet port of the I.MX8, which is available on the back connector of the I.MX8 MEK board using a custom design board. Our understanding is that we need to add a PHY. We would like to use the DP83867. I'm wondering how this will then work with linux. I have very little experience with Linux drivers. I'm using the yocto linux provided by NXP (branch imx-linux-zeus - imx-5.4.70-2.3.1) and I'm wondering if it will support this PHY or not ? If it does not, which PHY are supported (we may consider using another one then...) ? If it does, what do I need to do in Linux to get the 2nd connection active then ? Thanks,

[igorpadykov · Accepted solution]

Hi Edouard

for second ethernet port one can try enet accessory cards (like IMX-RMII-BRPHY with TJA1100) described on

https://www.nxp.com/design/development-boards/i-mx-evaluation-and-development-boards/i-mx-8-series-a...

for software use fsl-imx8qxp-mek-enet2-tja1100.dts

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qxp-mek-...

Default nxp bsps do not support DP83867, one will have to port it, use its driver

https://source.codeaurora.org/external/imx/linux-imx/tree/drivers/net/phy/dp83867.c?h=imx_5.4.70_2.3...

Best regards
igor

[edouard_charvet]

@igorpadykov : thanks for the answer. Can you be a bit more explicit with what I need to do to "port" the DP83867 driver you provided in the link ? Is this a complex task ? I could rebuild the yocto distribution that is mentioned in my initial post. How do I add the driver to this ? Do I need to create a new yocto recipe; or add it to an existing recipe ? How do I "plug" it into the kernel ? Is there some files from the filesystem to modify ? I know very little about drivers in Linux... Any examples or guided walkthrough would be greatly appreciated...

Thanks for your help.

[igorpadykov]

Hi Edouard

regarding porting new driver, unfortunately it is not simple task. NXP has special

service for help with porting new drivers: https://contact.nxp.com/new-prof-svcs-sw-tech

As general documentation one can refer to  i.MX Porting Guide​

Best regards
igor