Re: [U-Boot] Makefile and build stiching for ARM SoC

Dear Ayewin Oung,

In message o2mae8480551005041105gfff68619wf6f9032cdd95995@mail.gmail.com you wrote:

This is my "Hi, I am new to U-Boot, how do I get started?" email..

Welcome.

The thing I'm missing is, how is to level Makefile's

xxxx_config : unconfig @$(MKCONFIG) $(@:_config=) arm arm926ejs xxxx <aaa> <bbb>

To actually invoking which Makefiles in which sub-directories etc...

Here the top level Makefile sources your board settings:

153 # load ARCH, BOARD, and CPU configuration 154 include $(obj)include/config.mk 155 export ARCH CPU BOARD VENDOR SOC

Here it adds a make target for your board specific code:

250 LIBBOARD = board/$(BOARDDIR)/lib$(BOARD).a 251 LIBBOARD := $(addprefix $(obj),$(LIBBOARD))

And here it adds this to the list of libraries to build:

285 __OBJS := $(subst $(obj),,$(OBJS)) 286 __LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))

Here is the build dependency:

342 $(obj)u-boot: depend $(SUBDIRS) $(OBJS) $(LIBBOARD) $(LIBS) $(LDSCRIPT) $(obj)u-boot.lds

and here the build rule which will invoce your board dirctory's Makefile:

358 $(LIBBOARD): depend $(LIBS) 359 $(MAKE) -C $(dir $(subst $(obj),,$@))

Best regards,

Wolfgang Denk