[U-Boot] One u-boot.bin for Raspberry PI 3 and 4 - possible?

[Geoff Williams]

Hi Matthias,

>> My dream is to be able to compile a single u-boot.bin compiled as armv8-a and be
>> able to boot any Raspberry PI 3/4 to grub2 from it. Is this realistic?
>>
>
> Yes it is. I was working on this the last weeks and just posted the patches
> today. Would be nice if you could test and provide feedback :)

Thanks heaps for this! I'll make some time to test it over the weekend.

Cheers,
Geoff