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

[Masahiro Yamada]

Hi Yehuda, Tom, Simon,



2015-03-07 0:12 GMT+09:00 Tom Rini <trini at konsulko.com>:
> On Thu, Mar 05, 2015 at 06:20:35PM +0000, Yehuda Yitschak wrote:
>> Hey Tom
>>
>> In arch/arm/dts/Makfile: line 56
>> "DTC_FLAGS += -R 4 -p 0x1000"
>>
>> this tell the dtc tool to add a 4K padding to the device tree blob.
>>
>> i can't figure out why this is needed.
>> Its creating a 4KB penalty on the dtb file so i guess it has some justification.
>
> That's interesting and I don't see a corresponding thing in the kernel.
> Masahiro?  This dates back to the introduction of the Makefile and
> that's you in the git log, thanks!

Not me!
I just converted the Makefile into Kbuild style.


The option "-R 4 -p 0x1000" was introduced by:

commit bbb0b128c3956ac549471addc314702fbe0ace63
Author: Simon Glass <sjg at chromium.org>
Date:   Sat Oct 15 05:48:21 2011 +0000

    fdt: Add support for embedded device tree (CONFIG_OF_EMBED)


Simon,
Looks like the 4K padding was introduced by you.
Can you explain why?

Best Regards
Masahiro Yamada