[U-Boot] 4K padding of ARM DT blob

[Masahiro Yamada]

Hi.

2015-03-12 15:46 GMT+09:00 Yehuda Yitschak <yehuday at marvell.com>:
> Hey Simon
>
> Thanks for the clarification
>
> Just out of curiosity, how can the padding help modify the FDT in u-boot ?

If you insert a new node/property, or change a property for a longer value,
the FDT blob will get longer.
So, you need some extra space for modification.
Otherwise, the U-Boot image will be overritten in case of CONFIG_OF_EMBED.

But, as Simon said, U-Boot never modifies a FDT that is used
to configure U-Boot itself.


Just in case, let me add a little more explanation:
What is confusing is, U-Boot can modify a FDT that is passed to the kernel.
U-Boot can have two different instances of FDTs: one for configuring
U-Boot and the other
for configuring Linux.
We are talking about the former in this thread.



Best Regards
Masahiro Yamada