Dear Raphael Philipe,

In message <caengnhddme5v75wtm+u3w68-zafbtbsrrkfntjfspcypkg1...@mail.gmail.com> 
you wrote:
> 
> I'm working on the improvement of the recipes of u-boot in the Poky
> reference system of Yocto project.

Thanks a lot in advance!

> My questions are:
> 
> - what is the build system used in u-boot?

It is based on Kbuild in combination with specific scripts (buildman)
especially for mass-building.  It is tailored to be usable with a
large variety of tool chains.

> - Does this build system change for building the tools?

No.

> - What do I need to change when compiling the tools for the host
> architecture and for the target?

Change?  Nothing.  You just run a different command.


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
To make this work we'd need a patch, as nobody of us tests this.
- L. Poettering in https://bugs.freedesktop.org/show_bug.cgi?id=74589
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