u-boot/board/ait/cam_enc_4xx/config.mk
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

20 lines
580 B
Makefile

#
# AIT cam_enc_4xx board
# cam_enc_4xx board has 1 bank of 256 MB DDR RAM
# Physical Address: 8000'0000 to 9000'0000
#
# Linux Kernel is expected to be at 8000'8000, entry 8000'8000
# (mem base + reserved)
#
UBL_CONFIG = $(SRCTREE)/board/$(BOARDDIR)/ublimage.cfg
ifndef CONFIG_SPL_BUILD
ALL-y += u-boot.ubl
else
# as SPL_TEXT_BASE is not page-aligned, we need for some
# linkers the -n flag (Do not page align data), to prevent
# the following error message:
# arm-linux-ld: u-boot-spl: Not enough room for program headers, try linking
# with -N
LDFLAGS_u-boot-spl += -n
endif