[U-Boot] [PATCH] env: Setup GD_FLG_ENV_DEFAULT flag when default environment are used

[Alexander Graf]

> Am 31.05.2016 um 07:04 schrieb Michal Simek <michal.simek at xilinx.com>:
> 
>> On 30.5.2016 21:36, Alexander Graf wrote:
>> 
>> 
>>> On 05/30/2016 04:11 PM, Michal Simek wrote:
>>> Setup flag when default environment are used to be able to
>>> rewrite default distro boot variables based on SoC boot mode.
>>> 
>>> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
>>> ---
>>> 
>>> I didn't find any way how to detect that default or saved variables are
>>> used. I want to have a flag to be able to rewrite boot_targets variable
>>> based on boot mode. Especially when SD boot mode is setup than SD should
>>> be primary boot devices, etc.
>>> When variables are saved boot_targets will be restored and SoC boot mode
>>> will be ignored.
>>> If you know better way how to do it, please let me know.
>> 
>> You may want to be able to do the same from inside a script, so I guess
>> we should better have this as an environment variable itself again.
> 
> Was there any environment in past?

With again I meant "from C as well as from script".

>> 
>> There was a way to have environment variable reads return a value
>> directly from code rather than go via environment storage. I guess we
>> could expose the flag through that?
> 
> If you expose environment variable and then run saveenv this variable
> will be saved and restored again and your script behaves the same.

Not if we declare the environment variable read as callback ;).

Alex