[U-Boot] [PATCH] imx: missing CONFIG_NET after consolidation patches

[Heiko Schocher <hs@denx.de>]

Hello Bin,

Am 29.05.2015 04:33, schrieb Bin Meng:
> Hi Joe,
>
> On Fri, May 29, 2015 at 1:53 AM, Joe Hershberger
> <joe.hershberger@gmail.com> wrote:
>> Hi Stefano,
>>
>> On Wed, May 27, 2015 at 4:29 AM, Stefano Babic <sbabic@denx.de> wrote:
>>> commit fd3056337e6fcc140f400e11edd33f6f1cb37de1
>>> "Use env callbacks for net variables" has a side effect
>>> on i.MX6 boards because they do not set CONFIG_NET:
>>> the ip address results not set, but it is stored
>>> in the environment.
>>>
>>> => pri ipaddr
>>> ipaddr=192.168.178.66
>>> => ping 192.168.178.1
>>> *** ERROR: `ipaddr' not set
>>> ping failed; host 192.168.178.1 is not alive
>>>
>>> Setting CONFIG_NET solves this issue.
>>>
>>> Reported-by: Heiko Schoker <hs@denx.de>
>>> Signed-off-by: Stefano Babic <sbabic@denx.de>
>>> ---
>>>   include/configs/mx6_common.h | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/include/configs/mx6_common.h b/include/configs/mx6_common.h
>>> index 233c6d2..3d859cf 100644
>>> --- a/include/configs/mx6_common.h
>>> +++ b/include/configs/mx6_common.h
>>> @@ -105,4 +105,7 @@
>>>   #define CONFIG_FSL_ESDHC
>>>   #define CONFIG_FSL_USDHC
>>>
>>> +/* NET */
>>> +#define CONFIG_NET
>>
>> This config was added to Kconfig here:
>>
>> 60296a8 commands: add more command entries in Kconfig
>
> Looks CONFIG_NET was added by commit ed36323
>
> commit ed36323f6d217050f82a2200475959b8557a47e4
> Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
> Date:   Tue Sep 16 16:32:58 2014 +0900
>
>      kconfig: add blank Kconfig files
>
>> Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
>> Date:   Thu Nov 13 19:29:08 2014 +0900
>>
>> Apparently some of the boards that supported NET previously were not
>> properly added to their defconfigs.
>>
>> In any case, for this board, you should add the NET config to the
>> defconfig, not the header.
>>
>>>   #endif
>>
>
> But I failed to understand why adding CONFIG_NET could resolve the
> "*** ERROR: `ipaddr" not set' problem. A grep of "^CONFIG_NET" gives
> me nothing helpful.

Reason is the following commit:

commit fd3056337e6fcc140f400e11edd33f6f1cb37de1
Author: Joe Hershberger <joe.hershberger@ni.com>
Date:   Wed May 20 14:27:23 2015 -0500

     net: Use env callbacks for net variables

if CONFIG_NET is not defined, NET_CALLBACKS is empty, which results
in the above error message ...

bye,
Heiko
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