1. uClinux-dist/user/Makefile

dir_$(CONFIG_USER_HELLO_WORLD)

+= hello

2. uClinux-dist/config/Configure.help

CONFIG_USER_HELLO_WORLD

A simple hello world program

3. uClinux-dist/config/config.in

找到下面兩行

mainmenu_option next_comment

comment 'Miscellaneous Applications'

添加如下一行

bool 'hello'

CONFIG_USER_HELLO_WORLD

4.1.uClinux-dist/user/hello/Makefile

EXEC = hello
OBJS = hello.o

all: $(EXEC)

$(EXEC): $(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)

romfs:
$(ROMFSINST)    /bin/$(EXEC)

clean:
-rm -f $(EXEC) *.elf *.gdb *.o

4.2.uClinux-dist/user/hello/hello.c

#include <stdio.h>

int main()
{
printf("Hello, World/n");
return 0;
}

5. 將用戶程序編譯進romfs

# cd ~/uClinux-dist
# make menuconfig
# make dep
# make romfs