DSP

uclinux-2008R1.5-RC3(bf561)到VDSP5的移植(31):NR_CPUS

2019-07-13 15:42发布

  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(smp patch) Visual DSP++ 5.0(update 5)   欢迎转载,但请保留作者信息   有一个错误: "../../linux-2.6.x/include/linux/cpumask.h", line 88: cc0020:  error:           identifier "CONFIG_NR_CPUS" is undefined   typedef struct { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; NR_CPUS的定义在linux-2.6.x/include/linux/threads.h中: /*  * Maximum supported processors that can run under SMP.  This value is  * set via configure setting.  The maximum is equal to the size of the  * bitmasks used on that platform, i.e. 32 or 64.  Setting this smaller  * saves quite a bit of memory.  */ #ifdef CONFIG_SMP #define NR_CPUS        CONFIG_NR_CPUS #else #define NR_CPUS        1 #endif 由于希望使用SMP支持,故此定义了CONFIG_SMP,所以NR_CPUS的值就由CONFIG_NR_CPUS决定,查一下这个宏: 查找全部"CONFIG_NR_CPUS", 大小写匹配, 全字匹配, 子文件夹, 查找结果2, "F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x;F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/config", "*.*"   F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x/.config(140):CONFIG_NR_CPUS=2   F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x/.config.old(140):CONFIG_NR_CPUS=2   F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x/include/config/auto.conf(81):CONFIG_NR_CPUS=2   F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x/include/linux/autoconf.h(82):#define CONFIG_NR_CPUS 2   F:/embed/uClinux/uClinux-dist-2008R1.5-RC3/linux-2.6.x/include/linux/threads.h(17):#define NR_CPUS       CONFIG_NR_CPUS   匹配行: 5    匹配文件: 5    合计搜索文件: 13469   uclinux内核将bf561的每一个核都视为一个独立的CPU,因此在config.h中补上定义:   // 多核支持 #define       CONFIG_SMP                           1 #define       CONFIG_NR_CPUS                       2  

1       参考资料

uclinux-2008R1.5-RC3(bf561)VDSP5的移植(26)abs(2009-1-15) uclinux-2008R1.5-RC3(bf561)VDSP5的移植(27)CONFIG_RWSEM_GENERIC_SPINLOCK(2009-1-15) uclinux-2008R1.5-RC3(bf561)VDSP5的移植(28)CONFIG_HZ(2009-1-15) uclinux-2008R1.5-RC3(bf561)VDSP5的移植(29)cmdline_init(2009-1-15) uclinux-2008R1.5-RC3(bf561)VDSP5的移植(30)WARN(2009-1-15)