AM623: AM623

Hello Robert, 

RG said:

I'm interfacing the AM623 to a Marvel Ethernet Interface chip (88E6350) Link Street product line.

Please note that since this is a Marvel chip and not a TI one, we at TI will not be able to give specific advice when it comes to this Marvel chip.

RG said:

What information do I need to review to ensure it is compatible with the AM623 ROM code interacting with this chip to download the tiboot3,tispl,u-boot images etc?

Our reference design is SK-AM62B-P1, but it has an entirely different TI PHY part.

That being said, you may find some useful information about how the ROM handles Ethernet boot and what it expects from the PHY side in the AM62x TRM 5.4.5.1.1 Ethernet Initialization Process section.

Upon initial glance, it appears that if no MDIO scan mode is to be used, the ROM expects the link to be 1Gbps and full duplex (RGMII interface mode). There are more details on booting from RGMII mode which requires the attached PHY is configured for RGMII-ID mode immediately upon exiting reset (the ROM will not make this configuration change in the PHY). There may be more considerations needed especially since it sounds like you are using an Ethernet switch chip and not a PHY. 

Please let us know if you have additional follow-up questions.

-Daolin

When Link Info = 1, no MDIO scan is performed, and the link parameters are programmed by the ROM based on
the RGMII status register. This is the typical setting when configured as a MAC to MAC RGMII interface whereby
RGMII pins of two devices can be connected diretly and establish link in force mode. The chosen configuration
will be Gigabit, full duplex mode.
Note that booting from RGMII requires that an attached PHY be configured for RGMII-ID Mode immediately
upon exiting reset. The ROM will not make this configuration change to the PHY.