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net, doc: How to setup MAC address correctly

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As this seems unclear, document how the flow of setting up
the MAC address is correct.

Signed-off-by: Heiko Schocher <hs@denx.de>

Text changed slightly, adding input from Mike Frysinger.

Signed-off-by: Wolfgang Denk <wd@denx.de>
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Heiko Schocher 2010-03-31 08:34:51 +02:00 committed by Wolfgang Denk
parent b78b48c6a0
commit 8e64d6efd8
1 changed files with 11 additions and 0 deletions
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doc/README.enetaddr
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@ -28,6 +28,17 @@ Here are the places where MAC addresses might be stored:
purpose of passing this information to an OS kernel we are about
to boot
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.
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.
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Usage
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