Re: Each boot on my Cubietruck, and different MACaddr

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Hi Hans,

>> On 9 September 2014 06:40:54 GMT+08:00, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> wrote:
>>> I do not have this behaviour on the Cubieboard2, just on my Cubietruck.
>>>
>>> I thought it was a problem with the F21 build, but today I am working
>>> with F19 remix:
>>>
>>> http://docs.cubieboard.org/tutorials/cb2/installation/cb2_fedora_19_card_install
>>>
>>> And I keep getting a different MACaddr.  This makes it really hard to
>>> use persistant.rules to control things based on MACaddr.
>>>
>>> Is this just my particular Cubietruck?  I remember Hans talking about
>>> since there is no eeprom, he has to use SID as the basis for the
>>> MACaddr.
>>>
>>> Is there anyway for me to set the MACaddr.  It is eating up all my dhcp
>>>
>>> addresses.
>>
>> There are rules for what constitutes a valid mac address, if yours in invalid the kernel driver will assign you a random one, and then it looks like a new machine every time.
>>
>> You can force the mac address in userland /etc/rc.d/rc.local using /sbin/nameif + /etc/mactab, it's dirty but it will get you out of the hole if it runs before the dhclient action poisons your dhcp server.
>>
>> If the network driver uses phylib, there is a generic Device Tree name you can use like this inside the ethernet stanza to force it
>>
>> local-mac-address = [ aa bb cc dd ee ff ];
>>
>> if so, you can think about adding / overriding that DT node in U-Boot before passing to kernel.
>>
>> I sent patches on lkml to improve this a couple of years ago (for Panda, which has no nonvolatile config onboard) by replacing an invalid MAC with computing a consistent per-board MAC from CPU serial ID but The Powers That Be felt it should be fixed by the distros... which as you see...
>
> This has been solved in u-boot in the mean time, u-boot now a days calculates a unique mac
> derived from the CPU serial id, and passes this to the kernel.

Is this just on sunxi based devices or on all devices that have
ethernet without MAC addresses?

Peter
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