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

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<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

快乐虾

http://blog.csdn.net/lights_joy/

lights@hb165.com

本文适用于

ADI bf561 DSP

优视BF561EVB开发板

uclinux-2008r1.5-rc3

Visual DSP++ 5.0(update 5)

欢迎转载,但请保留作者信息

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__bss_stoparch/blackfin/kernel/vmlinus.lds.s中定义:

.bss :

{

. = ALIGN(4);

___bss_start = .;

*(.bss .bss.*)

*(COMMON)

. = ALIGN(4);

___bss_stop = .;

__end = .;

}

再看看head.s中对这个两个值的使用:

/* Code update for BSS size == 0

* Zero out the bss region.

*/

p1.l = ___bss_start;

p1.h = ___bss_start;

p2.l = ___bss_stop;

p2.h = ___bss_stop;

r0 = 0;

p2 -= p1;

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

.L_clear_bss:

B[p1++] = r0;

也就是说,它将把bss段中的所有数据清0,这个和vdsp程序中的bsz是一样的。为此我们在SDRAM中定义一块内存,并将bss段的数据都放到一起:

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

MEM_SDRAM_BANK0 { TYPE(RAM) START(0x00020000) 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) }

先从BANK064K出来,内存定义后面还要进行修改的,不要着急,呵呵。本来是不应该以64k为单位划分内存的,只不过vdsp的链接器有些BUG,不好使,只好先浪费点空间了。

接下来要在p0里面建一个段:

uclinux_bss ZERO_INIT

{

INPUT_SECTION_ALIGN(4)

___bss_start = .;

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

INPUT_SECTIONS($LIBRARIES_CORE_A(COMMON))

INPUT_SECTION_ALIGN(4)

. = (. + 3) / 4 * 4;

___bss_stop = .;

__end = .;

} > MEM_UCLINUX_BSS

注意,这里的___bss_start有三个下划线!

再链接,少了两个错误:

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

'_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_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" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5移植(2):代码注释(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(3):vdsp项目创建(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(4):目录差异(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(5):'bf561.h'的问题(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(6)CONFIG_BFIN_KERNEL_CLOCK(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(7)CONFIG_MEM_MT48LC16M16A2TG_75(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(8):CONFIG_CLKIN_HZ(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(9):CONFIG_MEM_SIZE(<chsdate w:st="on" year="2009" month="1" day="12" islunardate="False" isrocdate="False">2009-1-12</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(10):CONFIG_FLASH_SPEED_BTT(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(11):__INIT(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(12):trace_buffer_init(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(13):ENDPROC(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)VDSP5的移植(14)__FINIT(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)VDSP5的移植(15)CONFIG_BANK_x(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

uclinux-2008R1.5-RC3(bf561)VDSP5的移植(16):使用head.s做为入口点(<chsdate w:st="on" year="2009" month="1" day="13" islunardate="False" isrocdate="False">2009-1-13</chsdate>)

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