AM6548: Using EMAC driver in MII mode on AM6548 SR2.0

Milan Oklobdzija32

Part Number: AM6548
Other Parts Discussed in Thread: SYSBIOS

Hello All,

I have a question regarding EMAC driver on custom board with SR2.0 ver of AM6548

My configuration is:
CCS ver: 9.2.0.00013
PDK - pdk_am65xx_1_0_7 (processor_sdk_rtos_am65xx_6_03_00_106)
SYSBIOS - 6.76.3.01

In the original test application - Emac_Icssg_TestApp in PDK 1.0.7 different firmwares are loaded to ICSSG PRUs depenindg on AM6548 silicon revision.
From what I could see in technical reference manual, architecture of ICSSGs in SR1.0 and SR2.0 is different in a sense that TXPRU was added in SR2.0.
So, in case of AM6548 SR2.0 there is also a firmware for TXPRU in ICSSG FW.

In order to use EMAC driver on my custom board with AM6548 SR1.0 I had to use MII interface instead of RGMII so I rebuilt the PRU FW according to the instructions from TI.
However, in production we now have only boards with AM6548 SR2.0 .

As far as I could see in PDK 1.0.7 there is no option to build FW for ICSSG in AM6548 SR2.0

Can I use the SR1.0 FW somehow on SR2.0 (without using TXPRUs on SR2.0)?
Is there a way that I can modify (to use MII instead of RGMII) and build FW for ICSSG in AM6548 SR2.0?

Best regards,
Milan

over 4 years ago

0 Dave Bell over 4 years ago

TI__Genius 14680 points

Milan,

I'm following up on this. We have a different firmware baseline for the updated ICSSG on SR2.0 silicon that leverages the new TX PRU, and MII is not yet supported in the SDK7.0 release. For your project we should be able to update the existing SR1.0 firmware version that you are using with MII support during your silicon migration on your boards. I'll update with a proper recommendation shortly.

Best regards,

Dave

0 Milan Oklobdzija32 over 4 years ago in reply to Dave Bell

Intellectual 350 points

Thanks Dave,

So this means that I will be able to modify SR1.0 ICSSG FW in order to use it on SR2.0 but without an additional TXPRU in SR2.0's ICSSG?
This would be just fine for us at this point in development.

Best regards,
Milan

0 Dave Bell over 4 years ago in reply to Milan Oklobdzija32

TI__Genius 14680 points

Milan,

Coming back to this request. Following discussions with the firmware team, our preferred path will be to support on the new SR2 firmware baseline and we should have the MII configuration in place in the first or second week of October. For the SR1 firmware there are additional changes needed on the driver side with the silicon migration that will take some effort and some time to validate and would be a similar/longer timeline. I'll update you as soon as we have this ready.

Best regards,

Dave

0 Dave Bell over 4 years ago in reply to Dave Bell

TI__Genius 14680 points

Milan,

This will be coming in the sdk 7.1 release, which is a little delayed and expected beginning November for AM65. This will be supported with the SR2 firmware baseline.

Best regards,

Dave

0 Milan Oklobdzija32 over 4 years ago in reply to Dave Bell

Intellectual 350 points

Hello Dave,

Temporary MII modification for SR2.0 that you provided us works on our board.
Thank you very much for the effort.

I see that currently in EmacLoopbackTest app only EMAC_MODE_POLL is supported for SR2.0
Is there a way to use interrupt mode on SR2.0 or it is not supported currently?

Best regards,
Milan

0 Dave Bell over 4 years ago in reply to Milan Oklobdzija32

TI__Genius 14680 points

Milan,

Currently it is only supporting the POLL mode. This is a roadmap item to address, and will be added in the future with the enet_lld
Please do refer to https://e2e.ti.com/support/processors/f/791/t/935569 for an overview of the enet_lld, which will be introduced shortly with the SDK7.1 release.

Best regards,
Dave

0 Milan Oklobdzija32 over 4 years ago in reply to Dave Bell

Intellectual 350 points

Hello Dave,

Thank you for the detalied explanation.
It is no problem for us. Currently we will use poll mode until SDK 7.1 is ready.

Best regards,
Milan

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AM6548: Using EMAC driver in MII mode on AM6548 SR2.0