SGMII@2.5 on custom board based on LS1046A.

[harish_kamalapu]

We have a custom board based on LS1046A processor.

We configure the RCW to get SGMII.9@2.5G , SGMII.10@2.5G and SGMII.6@1G. We don't have any PHY's on the board. We plan to connect another MAC over SGMII.9 and SGMII.10. We also plan to connect an SFP module to SGMII.6.

I was looking at the code to initialize the Ethernet macs in u-boot. I looked at all the three eval boards i.e.

board/freescale/ls1046ardb/eth.c

board/freescale/ls1046afrwy/eth.c

board/freescale/ls1046aqds/eth.c

All the above boards have a PHY connected to the SGMII. I see the code related to setting the mdio and phy address etc in the eth.c file.

What is the initialization code to be added to support our case i.e. without PHY in the eth.c file ?

Do we have any example board which i can take as reference?

[bpe]

u-Boot sets the SerDes to auto-negotiate over SGMII. If the
device at the other end of an SGMII link is configurable to send a
PHY-side response of autonegotiation type SGMII, then nothing has
to be changed. If the other end has no autoneg support  or supports
only the MAC side SGMII autoneg, then see LS1046ARM, Sections 31.8.1.1
and 31.8.1.2.

Have a great day,
Platon

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