Fit images and EFI_LOAD_FILE2_PROTOCOL

[Grant Likely]

On 06/10/2020 13:52, Heinrich Schuchardt wrote:
> On 06.10.20 14:43, Grant Likely wrote:
> 
>>
>> Current U-Boot by default uses the same DT image for both U-Boot
>> internal setup and to provide to the OS. This should be split so that
>> the U-Boot internal version has what U-Boot needs without needs to track
>> mainline Linux DTB schema.
>>
>> I've been looking into a generic config for adding a separate OS-dtb to
>> U-Boot that is not used internally and is only passed to the OS. That
>> would solve the problem you're seeing above.
> 
> What would be the advantage of building said second device-tree into
> U-Boot instead of loading it from a (possibly signed) file?

I would see that as an implementation detail, but from the OS point of 
view EBBR requires the firmware to provide a DTB to the OS without the 
OS having any involvement in providing it. The easiest solution is to 
embed the OS dtb into U-Boot, but it could be loaded and verified from a 
file as well.

g.