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Adding User Applications to the uClinux Distribution
----------------------------------------------------
D. P. Siddons
9th Dec. 2001
This document gives simple instructions for adding a user-written application to
the uClinux configuration system. Entries must be added to three files, and an
apropriate Makefile must exist in the user application source directory, which
must be put in user (all directory names here are given relative to the uClinux
top directory. In my system this is /home/peter/uClinux-dist).
Files to edit:
user/Makefile
Add a line to the file like
dir_$(CONFIG_USER_FOO_FOO) += foo
This adds the directory 'foo' to the list of directories to be built. I added
mine in alphabetical order. The order doesn't seem to matter.
config/Configure.help
This file contains the text which is presented on request during the
config.
Add a block like
CONFIG_USER_FOO_FOO
This program does fooey things to your bars.
The text must be indented two spaces, and there must be no empty lines. Lines
should be <70 chars long.
config/config.in:
Add a line in the apropriate menu section (i.e. in the program group you want
your app to show up in during 'make config'; I used 'misc'), like
bool 'foo' CONFIG_USER_FOO_FOO
The repetition of FOO allows for directories which contain multiple
executables. Thus, if the user directory 'foo' contained code to make 'foo'
and 'bar', each gets its own config line if an additional entry is made like
bool 'bar' CONFIG_USER_FOO_BAR
Next, there needs to be a proper /user/foo/Makefile. The Makefile should follow
the following template:
--------------------------------------------
EXEC = foo
OBJS = foo.o
all: $(EXEC)
$(EXEC): $(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
romfs:
$(ROMFSINST) /bin/$(EXEC) 放哪里在这里决定
clean:
-rm -f $(EXEC) *.elf *.gdb *.o
---------------------------------------------
If more than one executable is built in the foo directory, as above, then the
Makefile should look like
------------------------------------------------------------
EXECS = foo bar
OBJS = foo.o bar.o
all: $(EXECS)
$(EXECS): $(OBJS)
$(CC) $(LDFLAGS) -o $@ [email protected] $(LDLIBS)
romfs:
$(ROMFSINST) -e CONFIG_USER_FOO_FOO /bin/foo
$(ROMFSINST) -e CONFIG_USER_FOO_BAR /bin/bar
--------------------------------------------------------------
More complex makefiles are of course possible. The reader is encouraged to
browse the user tree for examples.
When all this is set up, doing the standard 'make xconfig; make dep; make'
should build the app and install it in romfs and hence in the target system
image.bin. |
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