创建uclinux工程时，默认的入口是uclinux-2008r1-rc8_basiccrt.s，而我们需要用head.s做为入口，因此需要修改ldf文件中的相关定义。
在uclinux-2008r1-rc8.ldf文件中有这么几行：
$OBJECTS_CORE_A =
/*$VDSG<insert-user-objects-for-coreA-beginning> */
/* Text inserted between these $VDSG comments will be preserved */
/*$VDSG<insert-user-objects-for-coreA-beginning> */
".\Debug\uclinux-2008r1-rc8_basiccrt.doj"
, RT_LIB_NAME(profile561)
, $COMMAND_LINE_OBJECTS {!DualCoreMem("CoreB")}
, "cplbtab561a.doj"
, RT_OBJ_NAME(crtn561)
在此先删除uclinux-2008r1-rc8_basiccrt.doj，于是就变成了
$OBJECTS_CORE_A =
/*$VDSG<insert-user-objects-for-coreA-beginning> */
/* Text inserted between these $VDSG comments will be preserved */
/*$VDSG<insert-user-objects-for-coreA-beginning> */
RT_LIB_NAME(profile561)
, $COMMAND_LINE_OBJECTS {!DualCoreMem("CoreB")}
, "cplbtab561a.doj"
, RT_OBJ_NAME(crtn561)
此外，还要在processor p0中保留__start的位置。在默认生成的LDF文件中，是这样的：
RESOLVE(start, 0xFFA00000)
KEEP(start,_main)
我们将其指向head.s中的__start，修改后变成：
RESOLVE(__start, 0xFFA00000)
KEEP(__start,_main)
当然，这样修改后会造成一系列的错误：
'CONFIG_BANK_0' referenced from 'corea.dlb[head.doj]'
'CONFIG_BANK_1' referenced from 'corea.dlb[head.doj]'
'CONFIG_BANK_2' referenced from 'corea.dlb[head.doj]'
'CONFIG_BANK_3' referenced from 'corea.dlb[head.doj]'
'V_AMBEN' referenced from 'corea.dlb[head.doj]'
'__bss_start [___bss_start]' referenced from 'corea.dlb[head.doj]'
'__bss_stop [___bss_stop]' referenced from 'corea.dlb[head.doj]'
'_sdata [__sdata]' referenced from 'corea.dlb[head.doj]'
'_stext [__stext]' referenced from 'corea.dlb[head.doj]'
'bf53x_relocate_l1_mem [_bf53x_relocate_l1_mem]' referenced from 'corea.dlb[head.doj]'
'cmdline_init [_cmdline_init]' referenced from 'corea.dlb[head.doj]'
'init_thread_union [_init_thread_union]' referenced from 'corea.dlb[head.doj]'
'start_kernel [_start_kernel]' referenced from 'corea.dlb[head.doj]'
没关系，这正好说明我们的head.s已经开始起作用了。
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