uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(19)：_stext

 

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本文适用于

ADI bf561 DSP

优视BF561EVB开发板

uclinux-2008r1.5-rc3(smp patch)

Visual DSP++ 5.0(update 5)

  

欢迎转载，但请保留作者信息

 

看看到目前为止还有几个error：

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

        '_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_pda [_init_pda]' 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]'

下面开始解决_stext的问题。

先看看head.s中对_stext的使用：

       /* In case there is a NULL pointer reference

        * Zero out region before stext

        */

 

       p1.l = 0x0;

       p1.h = 0x0;

       r0.l = __stext;

       r0.h = __stext;

       r0 = r0 >> 1;

       p2 = r0;

       r0 = 0;

       lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;

.L_clear_zero:

       W[p1++] = r0;

这段代码的用意在于将代码段之前的SDRAM空间清0。在vmlinux.lds.s中将_stext定义为指向代码段的首地址，如下所示：

       .text :

       {

              __text = .;

              _text = .;

              __stext = .;

              TEXT_TEXT

              SCHED_TEXT

              LOCK_TEXT

              KPROBES_TEXT

              *(.text.*)

              *(.fixup)

 

              . = ALIGN(16);

              ___start___ex_table = .;

              *(__ex_table)

              ___stop___ex_table = .;

 

              . = ALIGN(4);

              __etext = .;

       }

相应地我们要在LDF文件中添加内容，还是先给代码段定义空间：

   MEM_UCLINUX_TEXT        { TYPE(RAM) START(0x00010000) END(0x0001ffff) WIDTH(8) }

   MEM_UCLINUX_DATA        { TYPE(RAM) START(0x00020000) END(0x0002ffff) WIDTH(8) }

   MEM_UCLINUX_BSS         { TYPE(RAM) START(0x00030000) END(0x0003ffff) WIDTH(8) }

   MEM_SDRAM_BANK0         { TYPE(RAM) START(0x00040000) END(0x00ffffff) WIDTH(8) }

   MEM_SDRAM_BANK1         { TYPE(RAM) START(0x01000000) END(0x01ffffff) WIDTH(8) }

   MEM_SDRAM_BANK2         { TYPE(RAM) START(0x02000000) END(0x02ffffff) WIDTH(8) }

   MEM_SDRAM_BANK3         { TYPE(RAM) START(0x03000000) END(0x03ffffff) WIDTH(8) }

接下来在p0里面定义text段：

        uclinux_text

        {

              __text = .;

              _text = .;

              __stext = .;

 

/*                        

              TEXT_TEXT

              SCHED_TEXT

              LOCK_TEXT

              KPROBES_TEXT

              *(.text.*)

              *(.fixup)

 

              . = ALIGN(16);

              ___start___ex_table = .;

              *(__ex_table)

              ___stop___ex_table = .;

*/

         INPUT_SECTION_ALIGN(4)

               __etext = .;

        } > MEM_UCLINUX_TEXT

内容暂时为空，后面根据需要添加。

看看还有几个error：

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

        '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_pda [_init_pda]' 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]'

 

1       参考资料

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(1)：前言(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(2)：代码注释(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(3)：vdsp项目创建(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(4)：目录差异(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(5)：'bf561.h'的问题(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(6)：CONFIG_BFIN_KERNEL_CLOCK(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(7)：CONFIG_MEM_MT48LC16M16A2TG_75(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(8)：CONFIG_CLKIN_HZ(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(9)：CONFIG_MEM_SIZE(2009-1-12)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(10)：CONFIG_FLASH_SPEED_BTT(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(11)：__INIT(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(12)：trace_buffer_init(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(13)：ENDPROC(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(14)：__FINIT(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(15)：CONFIG_BANK_x(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(16)：使用head.s做为入口点(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(17)：__bss_start(2009-1-13)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(18)：_sdata(2009-1-14)