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

[Masahiro Yamada]

Hi.


2015-03-12 17:58 GMT+09:00 Yehuda Yitschak <yehuday at marvell.com>:
> Thanks Masahiro
>
> Actually, I am considering to modify u-boot's own FDT to reflect changes in configurable boards like development boards.
> So maybe the padding is good for my needs after all  :)
>
> Do you see any issue with such an approach ?

Yes, depending on when you modify the FDT.

In Driver Model, most of drivers refer to the FDT when probing.
(The offset address is stored in the "of_offset" member of struct udevice.)

The scenario of our trouble is like this:

[1] Devices are bound by dm_init_and_scan().
    (udevice->of_offset is set)

[2] The FDT is modified.
    (The offset address to each node changes.)

[3] Some devices are probed
    (udevice->of_offset is referred, but the expected node is not there!)


I guess you can modify the FDT before [1] or after[3].

Simon,
What do you think?




-- 
Best Regards
Masahiro Yamada