How to change MAC address on RPI-B?

[Ian Lepore]

On Fri, 2016-11-25 at 22:18 -0700, Ian Lepore wrote:
> On Sat, 2016-11-26 at 00:07 +0100, diffusae wrote:
> > 
> > Hi John,
> > 
> > On 25.11.2016 20:56, John W. Kitz wrote:
> > 
> > > 
> > > 
> > > So when doing so the locally administered MAC address is passed
> > > on
> > > from
> > > uEnv.txt to the O/S during boot and is then used to override the
> > > globally
> > I didn't think, that it will be passed from the U-Boot Enviroment
> > settings. You can set the MAC address, but the FreeBSD kernel shows
> > always the unique MAC address.
> > 
> > > 
> > > 
> > > unique MAC address or does the O/S check both the information
> > > found
> > > in its
> > > configuration files and what is configured in uEnv.txt before
> > > configuring
> > > and activating the network interface(s)?
> > Which configuration files do you mean? AFAIK there is only the FDT
> > blob.
> > I guess it ignores the setting in uEnv.txt.
> > 
> > > 
> > > 
> > > Makes me wonder which of the two (i.e. locally administered
> > > through
> > > uEnv.txt
> > > or locally administered through the O/S) takes precedence.
> > Only the unique MAC address and the locally administered MAC
> > address,
> > will take affect.
> > 
> > > 
> > > 
> > > In addition this might affect configuration decisions when one
> > > would want to
> > > configure a device for net booting (at least when browsing
> > > through
> > > what can
> > > be configured by means of uEnv.txt I believe that was one of the
> > > options I
> > > saw) through uEnv.txt?
> > Personally, I like u-boot. It has various options, runs on a lot of
> > devices and it's also nice to handle.
> > 
> > Best regards,
> > _
> I looked into this tonight, and there is some code missing in u-boot
> to
> handle passing a mac address set in the u-boot environment into the
> kernel via the fdt data.
> 
> It would be pretty simple to fix.  We need to add an ethernet0 alias
> pointing to the /axi/usb/hub/ethernet node to our rpi dts, and the
> attached patch needs to replace the current one in the u-boot-rpi
> port.
> 
> This lets you set usbethaddr in the u-boot environment (via uEnv.txt
> or
> saved directly using saveenv), and it will get used by both u-boot
> and
> freebsd.
> 
> Having gotten it this far, I don't really have time right now to get
> the patch committed to ports.  Hopefully somebody else can help with
> that.
> 
> -- Ian

Looks like I forgot to attach the patch.  Try again...

-- Ian