Program net device MAC addresses after initializing

Add a new function to the eth_device struct for programming a network
controller's hardware address.

After all network devices have been initialized and the proper MAC address
for each has been determined, make a device driver call to program the
address into the device.  Only device instances with valid unicast addresses
will be programmed.

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
Acked-by: Detlev Zundel <dzu@denx.de>
Tested-by: Prafulla Wadaskar <prafulla@marvell.com>
Tested-by: Heiko Schocher <hs@denx.de>
Tested-by: Thomas Chou <thomas@wytron.com.tw>

1 files changed, 6 insertions, 4 deletions

diff --git a/doc/README.enetaddr b/doc/README.enetaddr
index 94d800a02a..2d8e24f5cb 100644
--- a/doc/README.enetaddr
+++ b/doc/README.enetaddr
@@ -33,11 +33,13 @@ Correct flow of setting up the MAC address (summarized):
 1. Read from hardware in initialize() function
 2. Read from environment in net/eth.c after initialize()
 3. Give priority to the value in the environment if a conflict
-4. Program hardware in the device's init() function.
+4. Program the address into hardware if the following conditions are met:
+	a) The relevant driver has a 'write_addr' function
+	b) The user hasn't set an 'ethmacskip' environment variable
+	c) The address is valid (unicast, not all-zeros)
 
-If somebody wants to subvert the design philosophy, this can be done
-in the board-specific board_eth_init() function by calling eth_init()
-after all the NICs have been registered.
+Previous behavior had the MAC address always being programmed into hardware
+in the device's init() function.
 
 -------
  Usage