Re: Setting MAC address from nv variable broken in barebox 2017.05.0?

[Ian Abbott <abbotti@mev.co.uk>]

On 08/05/17 19:12, Sascha Hauer wrote:
> On Mon, May 08, 2017 at 03:45:49PM +0100, Ian Abbott wrote:
>> On 08/05/17 14:39, Ian Abbott wrote:
>>> Hi,
>>>
>>> I'm not sure if this is a bug or whether I'm doing something wrong.  In
>>> barebox 2017.04.0 and earlier, I stored the Ethernet MAC address in a
>>> non-volatile ('nv') variable dev.eth0.macaddr=xx:xx:xx:xx:xx:xx and that
>>> got propagated to 'global' and the eth0 device on boot:
>>>
>>> barebox@xxxx:/ nv
>>>   allow_color: true
>>>   autoboot_timeout: 3
>>>   dev.eth0.ethaddr: xx:xx:xx:xx:xx:xx
>>>   user: none
>> [snip]
>>> However, in 2017.05.0, my 'dev.eth0.ethaddr' variable is no longer being
>>> propagated to global on boot, and as a consequence, is no longer
>>> propagated to eth0 (note that 'dev.eth0.ethaddr' is the only nv variable
>>> that I set manually when setting up a new board):
>>>
>>> barebox@xxxx:/ devinfo eth0
>>> Parameters:
>>>   ethaddr: 00:00:00:00:00:00
>>>   gateway: 0.0.0.0
>>>   ipaddr: 0.0.0.0
>>>   linux.bootargs:
>>>   netmask: 0.0.0.0
>>>   serverip: 0.0.0.0
>>>
>> [snip]
>>> Is this the proper behaviour or a bug?  Could it be related to commit
>>> 35d8e858bea17ec4796069c9c27fd0b134125eaf ("nv: Do not create globalvars
>>> from nvvars")?
>>
>> As a related follow-up, this code in globalvar_add_simple() looks a bit
>> strange:
>>
>> 	if (value)
>> 		dev_set_param(&global_device, name, value);
>>
>> 	globalvar_nv_sync(name);
>
> Ok, I think this should just be the other way round. Fixed in a patch I
> just sent.

Yes, I thought that might be the case about it being the wrong way 
round.  I tested your patch and it works.

While on the subject, what is the desired behaviour when removing an nv 
variable?  Currently, removing an nv variable also deletes a global with 
the same name, even if the global has changed value in the meantime:

barebox@xxxx:/ global -r quux
barebox@xxxx:/ nv -r quux
barebox@xxxx:/ nv quux=foo
barebox@xxxx:/ global quux=bar
barebox@xxxx:/ nv -r quux
barebox@xxxx:/ global
   ... list of globals but 'quux' is missing ...

In 2017-04-0, the global variable remained, although its value was cleared.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@mev.co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-

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