Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

03/01/2018

MJ 01:24 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

Hi
Thanks for that information - that was it!
U-Boot 'mii dump' command reports that the Dev Kit has a PHY ID of 3 but our board has a PHY ID of 2.
BUT ... it looks like the Dev Kit was designed for the PHY ID to be 2 but turned out... Mathew Jones

02/27/2018

DV 04:21 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

Seeing as u-boot works correctly and linux doesn't I believe this has to do with the PHY ID. u-boot will just probe all possible IDs on the MDIO interface until it finds one but unluckily linux requires you to specify it in the device tr... Daniel Vincelette

MJ 03:58 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

The device is the Microchip/Micrel KSZ9031RNX, which I believe is the same as the Dev Kit.
The MDIO pins are connected like the Dev Kit except that as recommended by Microchip there is a 1K MDIO pullup instead of 10K as on the Dev Kit.
... Mathew Jones

02/26/2018

MW 06:21 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

Sounds like reset is working properly.
Are the MDIO pins connected the same way as for the Dev Kit?
Have you updated the preloader for your FPGA build? Michael Williamson

MJ 03:56 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

Hi Mike
I believe the PHY is the same as the dev board, but I'll need to confirm that.
The activity LED for the PHY flashes during U-Boot start-up and then once for every ping out from U-Boot.
During Linux start-up I think I see the... Mathew Jones

02/23/2018

MW 12:31 PM Software Development: RE: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

What PHY are you using?
This sounds a lot like the PHY is maybe getting held in reset. Do you have a GPIO connected to the PHY reset pin? Can you scope that pin?
When linux boots, if you connect a network connection to the port, ... Michael Williamson

MJ 09:38 AM Software Development: MitySOM-5CSX ethernet PHY errors prevent ethernet in Linux

Hi,
We have a PCB based on the development kit, where we are using a MitySOM-5CSX-H6-4YA and boot from SD Card.
At start-up we get PHY errors under Linux that continually get output to the console and prevent the Ethernet port being us... Mathew Jones