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authorHeiko Schocher <hs@denx.de>2010-03-31 06:34:51 (GMT)
committerWolfgang Denk <wd@denx.de>2010-03-31 13:13:32 (GMT)
commit8e64d6efd8d778a5f83d8bff9cd273a86dcc182f (patch)
tree53a7889f6bb780dbe10d284269dca09aa95821bf /doc/README.enetaddr
parentb78b48c6a0c34b2991e31fc4548aaf773d34f2b3 (diff)
downloadu-boot-8e64d6efd8d778a5f83d8bff9cd273a86dcc182f.tar.xz
net, doc: How to setup MAC address correctly
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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diff --git a/doc/README.enetaddr b/doc/README.enetaddr
index 1d75aa3..94d800a 100644
--- a/doc/README.enetaddr
+++ b/doc/README.enetaddr
@@ -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.
+
-------
Usage
-------