[LS1028A]:QSGMII link is not coming up in u-boot

gjohnsona2e — Mon, 29 Dec 2025 23:22:50 GMT

We have a custom board using the LS1028A(actually a VA7230) with a VSC8574RT ethernet quad PHY. The LS1028 is connected to the PHY using QSGMII. In the u-boot build (defconfig), I have enabled CONFIG_PHY_MSCC and disabled CONFIG_PHY_VITESSE. Once u-boot comes up I am running these commands:

> setenv ethact swp3 > setenv ipaddr 192.168.1.3 > ping 192.168.1.1

Swp3 is directly connected to a PC with a static ip address of 192.168.1.1.

The ping times out and the host is not alive.

After further investigation, we have determined the following:
1) All of the external PHY's are detected and listed in the emdio-3 interface using the "mii info" command

2) The external PHY says that the link is up

3) The internal PHY says that the link is down

=> mii device enet-2 => mii dump 3 1 1. (0009) -- PHY status register -- (8000:0000) 1.15 = 0 100BASE-T4 able (4000:0000) 1.14 = 0 100BASE-X full duplex able (2000:0000) 1.13 = 0 100BASE-X half duplex able (1000:0000) 1.12 = 0 10 Mbps full duplex able (0800:0000) 1.11 = 0 10 Mbps half duplex able (0400:0000) 1.10 = 0 100BASE-T2 full duplex able (0200:0000) 1. 9 = 0 100BASE-T2 half duplex able (0100:0000) 1. 8 = 0 extended status (0080:0000) 1. 7 = 0 (reserved) (0040:0000) 1. 6 = 0 MF preamble suppression (0020:0000) 1. 5 = 0 A/N complete (0010:0000) 1. 4 = 0 remote fault (0008:0008) 1. 3 = 1 A/N able (0004:0000) 1. 2 = 0 link status (0002:0000) 1. 1 = 0 jabber detect (0001:0001) 1. 0 = 1 extended capabilities

I have compared this same setup with the LS1028ARDB devkit (which uses a VSC8514 external PHY) and it reports that its internal PHY link is up:

=> mii dump 3 1 1. (002d) -- PHY status register -- (8000:0000) 1.15 = 0 100BASE-T4 able (4000:0000) 1.14 = 0 100BASE-X full duplex able (2000:0000) 1.13 = 0 100BASE-X half duplex able (1000:0000) 1.12 = 0 10 Mbps full duplex able (0800:0000) 1.11 = 0 10 Mbps half duplex able (0400:0000) 1.10 = 0 100BASE-T2 full duplex able (0200:0000) 1. 9 = 0 100BASE-T2 half duplex able (0100:0000) 1. 8 = 0 extended status (0080:0000) 1. 7 = 0 (reserved) (0040:0000) 1. 6 = 0 MF preamble suppression (0020:0020) 1. 5 = 1 A/N complete (0010:0000) 1. 4 = 0 remote fault (0008:0008) 1. 3 = 1 A/N able (0004:0004) 1. 2 = 1 link status (0002:0000) 1. 1 = 0 jabber detect (0001:0001) 1. 0 = 1 extended capabilities

What could be causing the internal PHY to not complete auto-neg and not bring the link up?

Re: [LS1028A]:QSGMII link is not coming up in u-boot

June_Lu — Wed, 31 Dec 2025 09:28:08 GMT

Please kindly share the RCW setting related to the SerDes, the DTS setting,

And all the difference of the QSGMII part between the LS1028ARDB and the customer board.

Thanks

Processor Expert SoftwareのトピックRe: [LS1028A]:QSGMII link is not coming up in u-boot

[LS1028A]:QSGMII link is not coming up in u-boot

Re: [LS1028A]:QSGMII link is not coming up in u-boot