Hi all,
I am working on bringing up a custom imx8mplus based board. The imx processor has two ethernet connections:
- To an external phy (ksz9131) which is inturn connected to port 4 of external switch (ksz9477)
- Directly to port 6 of the same external switch. Port 6 is configured in RGMII mode and the switch bit is 1. The description of switch bit is as follows:
LED5_1 Switch Enable at Startup
0: Start Switch is disabled. The switch will not forward packets until the Start Switch bit is set
in the Switch Operation Register.
1: Start Switch is enabled. The switch will forward packets immediately after reset. (Default).
By making the below given modifications in the dts file and u-boot source code, I was able to detect the external phy (KSZ9131) and eth0 interface is up. But on connecting a ethernet cable, IP doesnot get assigned to eth0.
&fec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec>;
phy-mode = "rgmii-id";
phy-handle = <ðphy1>;
fsl,magic-packet;
status = "okay";
mdio {
#address-cells = <1>;
#size-cells = <0>;
ethphy1: ethernet-phy@3 {
reg = <3>;
compatible = "ethernet-phy-id0022.1640";
};
};
};
The MDIO lines of the processor is connected to switch and phy. On doing mii info, i am only able to detect the phy. MDIO list also gives the details of phy only.
Is there any modifications required to bring up the switch??. The processor is connected to just the port 6 of the switch so I believe that we dont need any special drivers for bringing it up. Is this understanding correct?. Also, is it possible to detect the switch through MDIO lines?. We have not done any modifications to the switch registers apart from setting the hardware strap LED5_1 to 1. Are any additional configurations required?
Please do help out on this issue.
Thank you,
Aaron
