T2080 EMI2

paulagarcía-mor — Thu, 11 Feb 2021 15:07:26 GMT

Hello,

I am working on a T2080 board, and I am experimenting some issues with the EMI2 bus.

I have a 10GB phy connected to one of the XFI interfaces of the SerDes, and the MDIO/MDC signals to the EMI2 bus.
In the same design I have two 1Gb phys connected to the EMI1.
I am finding that from uboot, I can 'find' the two phys on the EMI1 bus, but nothing from the EMI2.
I am measuring with an oscilloscope the signals, to check the integrity. The MDC signal is okey, and what I am experimenting is that MDIO has no movement when executing 'mii info'. This signal is always at 1V2, due to the pull up of the line.
What could be the issue? Eventhough the PHY configuration is wrong, it shouldn't affect to the MDIO/MDC bus, right?

Here's the commands on uboot:

=> mii dev FSL_MDIO0
=> mii info
PHY 0x06: OUI = 0x0885, Model = 0x22, Rev = 0x02, 10baseT, HDX
PHY 0x07: OUI = 0x0885, Model = 0x22, Rev = 0x02, 10baseT, HDX
=> mii dev FM_TGEC_MDIO
=> mii info
=>
=> mii info
=> mii info
=> mii info 0

Thank you in advance!

Re: T2080 EMI2

ufedor — Fri, 12 Feb 2021 06:14:22 GMT

It seems that there is an issue with U-Boot which has to be debugged.

On the T2080RDB I see:

=> mdio list

FSL_MDIO0:

1 - RealTek RTL8211E <--> FM1@DTSEC3

2 - RealTek RTL8211E <--> FM1@DTSEC4

FM_TGEC_MDIO:

0 - Generic 10G PHY <--> FM1@TGEC3

1 - Generic 10G PHY <--> FM1@TGEC4

12 - Cortina CS4315/CS4340 <--> FM1@TGEC1

13 - Cortina CS4315/CS4340 <--> FM1@TGEC2

=> mdio read FM_TGEC_MDIO 0 1.0

Reading from bus FM_TGEC_MDIO

PHY at address 0:

1.0 - 0x2040

=> mdio read FM_TGEC_MDIO 1 1.0

Reading from bus FM_TGEC_MDIO

PHY at address 1:

1.0 - 0x2040

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Re: T2080 EMI2