uclinux-2008R1-RC8(bf561)到VDSP5的移植（6）：__bss_start

 

  

添加完head.s后有几个链接错误：

[Error li1021] The following symbols referenced in processor 'p0' could not be resolved:

        '__bss_start [___bss_start]' referenced from 'corea.dlb[head.doj]'

        '__bss_stop [___bss_stop]' referenced from 'corea.dlb[head.doj]'

其中 __bss_start和 __bss_stop在vmlinus.lds中定义：

     .bss :

     {

         . = ALIGN(4);

         ___bss_start = .;

         *(.bss .bss.*)

         *(COMMON)

         . = ALIGN(4);

         ___bss_stop = .;

         __end = .;

     }

它就是一个指向.bss段开头的整数，我们需要在LDF中修改相应的定义：

      bsz_sdram ZERO_INIT

      {

         INPUT_SECTION_ALIGN(4)

         . = (. + 3) / 4 * 4;

               ___bss_start = .;

         INPUT_SECTIONS($OBJECTS_CORE_A(sdram_bsz) $LIBRARIES_CORE_A(sdram_bsz))

               INPUT_SECTIONS($LIBRARIES_CORE_A(.bss .bss.*))

               INPUT_SECTIONS($LIBRARIES_CORE_A(COMMON))

               

         INPUT_SECTION_ALIGN(4)

         . = (. + 3) / 4 * 4;

               ___bss_stop = .;

               __end = .;

      } > MEM_SDRAM