On Sat, 2013-12-14 at 18:12 +0100, Marek Vasut wrote:
On Saturday, December 14, 2013 at 04:39:00 PM, Sergei Ianovich wrote:
I strongly believe the current way is easier.
I disagree :)
IF you set 'ethaddr' variable in U-Boot THEN U-Boot will patch this 'ethaddr' value into your DT. The /aliases/ethernet0 node will be augmented with a new property 'local-mac-address', which will contain the MAC address from 'ethaddr' . The kernel will use this as the MAC address for that particular ethernet interface afterwards.
NOTE: It is very important to have the alias set, it has to point to your ethernet device. A good example in Linux's arch/arm/boot/dts/imx28.dtsi, which even has two ethernet interfaces. Notice each of them has an alias. NOTE: If you have two interfaces, then 'eth1addr' is patches into /aliases/ethernet1 etc.
Thanks for explaining. It works. This is COOL!
The only problem here is the non-DT kernel. Do you need to support that? Is there no other way to pass MAC address of an ethernet interface to Linux but programming it into the ethernet interface itself ?
Hardware vendor uses U-Boot environment values to init MAC-addresses. I think it is even worse than what I was doing in the patch.
I don't think we need to support non-DT kernel. So we drop the patch.