[PATCH] ARM: imx6: init enet MAC address

[Shawn Guo]

On Tue, May 20, 2014 at 02:11:06PM +0800, Fugang Duan wrote:
> Enet get MAC address order:
> From module parameters or kernel command line -> device tree ->
> pfuse -> mac registers set by bootloader -> random mac address.
> 
> When there have no "fec.macaddr" parameters set in kernel command
> line, enet driver get MAC address from device tree. And then if
> the MAC address set in device tree and is valid, enet driver get
> MAC address from device tree. Otherwise, enet get MAC address from
> pfuse. So, in the condition, update the MAC address (read from pfuse)
> to device tree.
> 
> Signed-off-by: Fugang Duan <B38611 at freescale.com>

I would think this is a board level configuration than SoC one.  Though
the register name in Reference Manual, OCOTP_MAC0 and OCOTP_MAC1,
recommends that these fuse bits can be used to store MAC address, it's
really up to board designers how to use these fuse bits, e.g. how the
MAC bytes will be stored in these 64 fuse bits, or on some board designs
which do not have Ethernet interface at all, these bits can totally be
used for other purpose.

So to me, it's inappropriate to assume that these fuse bits always hold
MAC address, and do this setup in kernel unconditionally for every
board.  I think it's more reasonable to do this setup in bootloader,
which should be more board specific and can understand these fuse bits
better.

Shawn