uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(19)：_stext
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
快乐虾
http://blog.csdn.net/lights_joy/
本文适用于
ADI bf561 DSP
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(<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(2)：代码注释(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(3)：vdsp项目创建(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(4)：目录差异(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(5)：'bf561.h'的问题(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(6)：CONFIG_BFIN_KERNEL_CLOCK(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(7)：CONFIG_MEM_MT48LC16M16A2TG_75(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(8)：CONFIG_CLKIN_HZ(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(9)：CONFIG_MEM_SIZE(<chsdate w:st="on" isrocdate="False" islunardate="False" day="12" month="1" year="2009">2009-1-12</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(10)：CONFIG_FLASH_SPEED_BTT(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(11)：__INIT(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(12)：trace_buffer_init(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(13)：ENDPROC(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(14)：__FINIT(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(15)：CONFIG_BANK_x(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(16)：使用head.s做为入口点(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(17)：__bss_start(<chsdate w:st="on" isrocdate="False" islunardate="False" day="13" month="1" year="2009">2009-1-13</chsdate>)
uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(18)：_sdata(<chsdate w:st="on" isrocdate="False" islunardate="False" day="14" month="1" year="2009">2009-1-14</chsdate>)