Re: [Intel-wired-lan] [next] igb: allow setting MAC address on i211 using a device tree blob V5

[John Holland]

On 02/18/2016 12:10 PM, John Holland wrote:
Hello,

The Intel i211 LOM PCIe Ethernet controllers' iNVM operates as an OTP
and has no external EEPROM interface [1]. The following allows the
driver to pickup the MAC address from a device tree blob when CONFIG_OF
has been enabled.

+       if (eth_platform_get_mac_address(&pdev->dev, hw->mac.addr)) {

For later reference, putting all necessary information in one place.

This requires the dtb for the mac address routing to be properly 
positioned. On an imx6q using U-Boot, that required setting the U-Boot 
environment variable eth1addr and reworking the PCIe tree and allocating 
an alias as such:

1) Set intel,i211 MAC address.

# env set eth1addr <valid-mac-address>

2) Add an alias to pick up the MAC address from U-Boot and route it to 
the intel,i211 PCIe endpoint for an imx6qdl derivative.

/ {
        aliases {
                ethernet1 = &eth1;
        };

};

&pcie {
        /* soc pcie bridge 00:00.0 */
        pcie@0,0 {
                reg = <0x000000 0 0 0 0>;
                #address-cells = <3>;
                #size-cells = <2>;

                /* pcie endpoint 01:00.0 */
                eth1: intel,i211@pcie0,0 {
                        reg = <0x010000 0 0 0 0>;
                };
        };
};

John