u-boot/arch/arm/cpu/armv7/omap5
Masahiro Yamada 9e4140329e kbuild: change out-of-tree build
This commit changes the working directory
where the build process occurs.

Before this commit, build process occurred under the source
tree for both in-tree and out-of-tree build.

That's why we needed to add $(obj) prefix to all generated
files in makefiles like follows:
  $(obj)u-boot.bin:  $(obj)u-boot

Here, $(obj) is empty for in-tree build, whereas it points
to the output directory for out-of-tree build.

And our old build system changes the current working directory
with "make -C <sub-dir>" syntax when descending into the
sub-directories.

On the other hand, Kbuild uses a different idea
to handle out-of-tree build and directory descending.

The build process of Kbuild always occurs under the output tree.
When "O=dir/to/store/output/files" is given, the build system
changes the current working directory to that directory and
restarts the make.

Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>"
syntax for descending into sub-directories.
(We can write it like "make $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
2014-02-19 11:07:50 -05:00
..
abb.c DRA7: add ABB setup for MPU voltage domain 2014-01-24 11:41:17 -05:00
config.mk kbuild: change out-of-tree build 2014-02-19 11:07:50 -05:00
emif.c Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
hw_data.c DRA7: Add support for ES1.1 silicon ID code 2014-01-24 11:41:17 -05:00
hwinit.c DRA7: Add support for ES1.1 silicon ID code 2014-01-24 11:41:17 -05:00
Makefile armv7: convert makefiles to Kbuild style 2013-10-31 12:53:39 -04:00
prcm-regs.c DRA7: add ABB setup for MPU voltage domain 2014-01-24 11:41:17 -05:00
sdram.c DRA7: Add support for ES1.1 silicon ID code 2014-01-24 11:41:17 -05:00