Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

uclinux boot failed !!!

hi all, I am trying to boot uclinux kernel on 2s60es board, I am using build root. I have change memory map (ram and CF still remains same) and removed CF, perf monitor, sysid. While ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

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. I built others utils into busybox. see http://nioswiki.jot.com/wikihome/operating...nux/uclinuxdist (http://nioswiki.jot.com/wikihome/operatingsystems/%c2%b5clinux/uclinuxdist)