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Page last modified 05:40, 25 Jan 2010 by hehui0101
Nios Community Wiki > OperatingSystems > uClinux > BusyBox

BusyBox

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This is about using busybox alone , not under buildroot or uClinux-dist.
You can download the latest snapshot or stable release from busybox.net .

Busybox, .config for cross compile


#
# Build Options
#
CONFIG_STATIC=y
# CONFIG_BUILD_LIBBUSYBOX is not set
# CONFIG_FEATURE_FULL_LIBBUSYBOX is not set
# CONFIG_FEATURE_SHARED_BUSYBOX is not set
CONFIG_LFS=y
USING_CROSS_COMPILER=y
CROSS_COMPILER_PREFIX="nios2-linux-uclibc-"
EXTRA_CFLAGS_OPTIONS="-Dfork=vfork -Ddaemon=clone"
# CONFIG_BUILD_AT_ONCE is not set

#
# Installation Options
#
# CONFIG_INSTALL_NO_USR is not set
CONFIG_INSTALL_APPLET_SYMLINKS=y
# CONFIG_INSTALL_APPLET_HARDLINKS is not set
# CONFIG_INSTALL_APPLET_DONT is not set
PREFIX="/home/hippo/rootfs"

I used this flags before, (but not now)
EXTRA_CFLAGS_OPTIONS="-D__uClinux__ -Dfork=vfork"



Busybox, Makefile add elf2flt flag


busybox_unstripped: .depend $(LIBBUSYBOX_SONAME) $(BUSYBOX_SRC) $(libraries-y)
$(do_link) $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) 
-Wl,-elf2flt="-s 16000" -Wl,-v -Wl,-d 
-o $@ -Wl,--start-group  
$(APPLETS_DEFINE) $(APPLET_SRC) 
$(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) 
$(LDBUSYBOX) $(LIBRARIES) 
-Wl,--end-group

busybox: busybox_unstripped
$(Q)cp busybox_unstripped busybox
# $(do_strip)


There is an important issue about busybox. It takes more memory on MMU-less arch.
So I moved away from busybox a little. I use stand alone init, sash, and servers from uClinux-dist. I built others utils into busybox.  see  UClinuxDist  .

     

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