[bug#57070] [PATCH] bootloader: extlinux: support for optional FDTDIR

[Pavel Shlyak]

Dear Maxime,

I do not think I can agree that «a relevant code could check what the hardware 
is» as it’s not hardware-defined, but also user-defined. It’s not just about 
detection, it’s also about choice. The same system definition I have on RPI4, 
for example, can boot both with kernel-provided FDT (loaded with uboot) and 
bootloader-provided FDT (loaded with RPI bootloader). There are also a lot of 
different devices out there on the market and there’s no common way to know how 
OS definition is written for it. If you have ideas - you’re welcome to propose 
your way to do it.

It does not appear to «be simply a kernel bug» to me. Kernel does not pass 
configuration to the bootloader and we’re configuring a bootloader entry here. 
It’s simple as that: bootloader entry may include or not include that line and 
that’s user-defined.

Of course, you’re always welcome to suggest your ideas how the automation you 
like to have could be implemented. Also, please, keep in mind this change 
doesn’t change anything on current boards/systems and most users won’t even 
notice this change is merged.

Sincerely,
Pavel Shlyak