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

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ADI bf561 DSP

优视BF561EVB开发板

uclinux-2008r1.5-rc3

Visual DSP++ 5.0(update 5)

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编译head.s时有几个警告（错误）：

[Warning pp0038] "..\linux-2.6.x\include\asm/mach/mem_init.h":32 macro 'CONFIG_CLKIN_HZ' not currently defined - 0 assumed

[Warning pp0038] "..\linux-2.6.x\include\asm/mach/mem_init.h":32 macro 'CONFIG_VCO_MULT' not currently defined - 0 assumed

[Warning pp0038] "..\linux-2.6.x\include\asm/mach/mem_init.h":32 macro 'CONFIG_SCLK_DIV' not currently defined - 0 assumed

[Error pp0059] "..\linux-2.6.x\include\asm/mach/mem_init.h":32 Division by zero

其错误均指向mem_init.h的32行：

#if (CONFIG_SCLK_HZ > 119402985)

CONFIG_SCLK_HZ的定义在linux-2.6.x/include/asm/mach-common/clocks.h中：

#ifdef CONFIG_CCLK_DIV_1

# define CONFIG_CCLK_ACT_DIV CCLK_DIV1

# define CONFIG_CCLK_DIV 1

#endif

#ifdef CONFIG_CCLK_DIV_2

# define CONFIG_CCLK_ACT_DIV CCLK_DIV2

# define CONFIG_CCLK_DIV 2

#endif

#ifdef CONFIG_CCLK_DIV_4

# define CONFIG_CCLK_ACT_DIV CCLK_DIV4

# define CONFIG_CCLK_DIV 4

#endif

#ifdef CONFIG_CCLK_DIV_8

# define CONFIG_CCLK_ACT_DIV CCLK_DIV8

# define CONFIG_CCLK_DIV 8

#endif

#ifndef CONFIG_PLL_BYPASS

# ifndef CONFIG_CLKIN_HALF

# define CONFIG_VCO_HZ (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT)

# else

# define CONFIG_VCO_HZ ((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT)/2)

# endif

# define CONFIG_CCLK_HZ (CONFIG_VCO_HZ/CONFIG_CCLK_DIV)

# define CONFIG_SCLK_HZ (CONFIG_VCO_HZ/CONFIG_SCLK_DIV)

#else

# define CONFIG_VCO_HZ (CONFIG_CLKIN_HZ)

# define CONFIG_CCLK_HZ (CONFIG_CLKIN_HZ)

# define CONFIG_SCLK_HZ (CONFIG_CLKIN_HZ)

# define CONFIG_VCO_MULT 0

#endif

在这里需要用到的几个宏定义均可在uclinux的配置菜单中指定，因此我们直接将这几个值定义到config.h中：

// 时钟配置

#define CONFIG_CLKIN_HZ 33000000 // 晶振频率

#define CONFIG_VCO_MULT 18 // 内核倍频

#define CONFIG_CCLK_DIV_1 1 // 内核分频

#define CONFIG_SCLK_DIV 6 // 系统分频

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>)