[OE-core] [PATCH] u-boot: Add {gen|deploy}_default_envs tasks to generate environment images

[Stefano Babic]

On 03/05/2018 18:36, Marek Vasut wrote:
> On 05/03/2018 06:28 PM, Stefano Babic wrote:
>> On 27/04/2018 17:07, Marek Vasut wrote:
>>> On 04/27/2018 04:51 PM, Lukasz Majewski wrote:
>>>> This commit provides the ability to generate u-boot environment(s) as
>>>> images, which afterwards can be used to produce image (with wic) for
>>>> flashing (eMMC or SPI-NOR).
>>>>
>>>> This change removes the need to run "env default" during production phase,
>>>> as proper environment (including redundant one) is already stored on
>>>> persistent memory (the CRC is also correct).
>>>>
>>>> Signed-off-by: Lukasz Majewski <lukma at denx.de>
>>>
>>> If your default env is correct, why do you need this ? I can see some
>>> use with non-default env, but then that can be wrapped into a separate
>>> recipe.
>>>
>>
>> A use case is when the environment must be changed from user space.
>> fw_setenv will report the CRC error and it needs the default environment
>> to add changes. The default environment is linked together to fw_setenv,
>> but this prohibites to use fw_setenv for multiple boards and must be
>> explicitely built for that machine and with the same sources as u-boot
>> (at least, they must share the same CONFIG_EXTRA_ENV). If the default
>> environment is extracted, we could have a general (distro ?) fw_setenv.
> 
> I think in that case, the real solution is to either build fw_setenv per
> machine 

This is how we try to do now, fw_setenv is built per machine but it is
enough that u-boot-fw-utils is built in a different version as u-boot to
get a mess.

> OR fix fw_setenv to take env defaults from a file or somesuch ?

Right, I interprete this patch as a step in this direction. This patch
generates a default that can be used as input for fw_setenv.

Regards,
Stefano

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