Name

of_get_mac_address — Get best MAC address

Synopsis

const void * of_get_mac_address (struct device_node * np);
 

Arguments

np

Node to get MAC address from

Description

Search the device tree for the best MAC address to use. The value of property mac-address is checked first, because that is supposed to contain to most recent MAC address. If that isn't set, then the value of property local-mac-address is checked next, because that is the default address. If that isn't set, then the value of the obsolete property address is checked, just in case we're using an old device tree.

Note that the address property is supposed to contain a virtual address of the register set, but some DTS files have redefined that property to be the MAC address.

All-zero MAC addresses are rejected, because those could be properties that exist in the device tree, but were not set by U-Boot. For example, the DTS could define mac-address and local-mac-address, with zero MAC addresses. Some older U-Boots only initialized local-mac-address. In this case, the real MAC is in local-mac-address, and mac-address exists but is all zeros.

Return

pointer to a property value