cpsw dual emac configuration - change to: eth0 is copy of eth1 data

Christopher Lang

Other Parts Discussed in Thread: AM3352

Hi All,

as per

"processors.wiki.ti.com/index.php/AM335x_CPSW_%28Ethernet%29_Driver%27s_Guide#Bringing_Up_interfaces"

we are using the two ethernet ports of the AM3352 as two independent ports in "dual emac" mode. It is working well and the device tree looks like that:

&mac {
    dual_emac = <1>;
    status = "okay";
};

&cpsw_emac0 {
    dual_emac_res_vlan = <1>;
};

&cpsw_emac1 {
    dual_emac_res_vlan = <2>;
};

The Linux image is based on Yocto YP Core - Dizzy (1.7.1).

For diagnostic purposes we would temporarily like to change the configuration in such a way so that the eth0 port is just a copy of the data on eth1.

Is that possible? Can it be done via device tree overlay or some sysfs configuration of the cpsw driver?

Any hints that you would be able to give us are highly appreciated.

many thanks in advance

Chris

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over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi Chris,

I will forward this to the Ethernet experts.

0 Schuyler Patton over 9 years ago in reply to Biser Gatchev-XID

TI__Mastermind 40080 points

Hello, could you go into more detail about how you want to copy? Could you provide a block diagram of the topology and how you would like the traffic to move?

Thanks.

0 Christopher Lang over 9 years ago in reply to Schuyler Patton

Prodigy 170 points

Hi Schuyler,

please see diagram below. The "Capture" is for diagnostic purposes only.

This system (cu4xx) is a BACnet controller. It controls the infrastructure of a building. In order not to have to unplug the very BacNet link the customer would like to plug his diagnostic system into the 2nd ethernet port of the Am3352 board.

many thanks

Chris

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cpsw dual emac configuration - change to: eth0 is copy of eth1 data