J721S2XSOMXEVM: RTOS: PDK: ENET: Phy Linkup takes 4seconds, and only works in Auto-Negotiation mode

Moses Christopher Bollavarapu

Part Number: J721S2XSOMXEVM

Tool/software:

Hi,

I am currently working with the CPSW2G, with GESI from mcu2_0. I see that the Phy Link Up always takes about 4000ms from the start of mcu2_0.

I had a look at the logs and found it is setting the mode to Full Duplex and 1GBit, so I tried to change the Mac LinkConfig(V3/enet_board_j721s2_evm.c) and Phy LinkConfig (EnetPhy_open); after that I don't see linkup at all.

Could you kindly let me know, how can I solve this issue?

In the end, I'd expect the Phy Link Up to happen much earlier than 4seconds.

Setup:

PDK 11.0
RTOS SDK 11.0
GESI Card - Static Eth Config in the lwip_example
Running on mcu2_0 started by uboot

Thank you.

Best,
Moses

1 day ago

0 Doredla Sudheer Kumar 20 hours ago

TI__Guru 63390 points

Hi,

PHY is not bootstrapped so, you can't force to specific Link speed. Link speed and Link up is depends on the Link partner availability.

Best Regards,
Sudheer

0 Moses Christopher Bollavarapu 5 hours ago in reply to Doredla Sudheer Kumar

Prodigy 235 points

Hi Sudheer,

Does this mean that even if the Link partner(s) are configured to be in manual-mode (autoneg off), and assigned proper speed and duplexity; this would still not work, because the TI Phy currently only works in AUTO Neg mode?

Best,
Moses

0 Moses Christopher Bollavarapu 4 hours ago in reply to Moses Christopher Bollavarapu

Prodigy 235 points

Also, IIUC, you are talking about Hw Bootstrapping of the Phys on GESI card, and even using J721E SoM wouldn't change anything except the other Phys on GESI being available, but still cannot be set to Manual mode (autoneg off). Am I right?

0 Doredla Sudheer Kumar 3 hours ago in reply to Moses Christopher Bollavarapu

TI__Guru 63390 points

Hi,

Moses Christopher Bollavarapu said:
Does this mean that even if the Link partner(s) are configured to be in manual-mode (autoneg off), and assigned proper speed and duplexity; this would still not work, because the TI Phy currently only works in AUTO Neg mode?

There is a phy statemachine running on ENET to transition to the Link Up state. It has a manual mode when forcing Link speed and Duplex information.
https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/11_00_00_06/exports/docs/pdk_jacinto_11_00_00_21/docs/apiguide/j721e/html/enetphy_guide_top.html#enetphy_guide_driver

Only for bootstrapped PHYs, the satamechine is skipped and directly waits for the Link state.

You can configure from the PHY driver during Config to disable Autonegotiation and Force to Specific Link speed.

Moses Christopher Bollavarapu said:
Also, IIUC, you are talking about Hw Bootstrapping of the Phys on GESI card, and even using J721E SoM wouldn't change anything except the other Phys on GESI being available, but still cannot be set to Manual mode (autoneg off). Am I right?

We don't have a boot-strapped PHY with Autoneg disabled and forced to fixed Link speed.

Best Regards,
Sudheer

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J721S2XSOMXEVM: RTOS: PDK: ENET: Phy Linkup takes 4seconds, and only works in Auto-Negotiation mode