devicemaps_init

devicemaps_init:

  1.  设置向量表映射:向boot_mem申请1page得到vectors=c0c3e000,映射的虚拟地址ffff0000,映射一个page,

         映射过程是先向boot_mem申请1page用于存储pte,这里一共1024个项512用于mmu(可映射2MB)另外512Linux维护

  2.  调用mdesc->map_io()  (soc层操作操作函数)将物理IO映射到虚拟地址,设置了时钟,gpio等

       smdkc110_map_io: arch/arm/mach-s5pv210/mach-x210

         s5p_init_io: 位于arch/arm/plat-s5p/cpu.c,(s5p系列层)IO初始化函数

           iotable_init(s5p_iodesc, ARRAY_SIZE(s5p_iodesc)):(s5p系列层)

             映射s5p系列7块IO

               https://www.cnblogs.com/genshu123/p/11330479.html

           idcode = __raw_readl(cpuid_addr);获取CHIPID:0x43110220

           s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids)):(s5p系列层)

             获取s5p系列层到子层的接口cpu并调用cpu->map_io()(子层操作函数)

             https://www.cnblogs.com/genshu123/p/11330575.html

            s3c24xx_init_clocks(24000000);(samsung层)

           调用子层的接口cpu(cpu->init_clocks)(24000000)初始化时钟

           https://www.cnblogs.com/genshu123/p/11331689.html

         s5pv210_gpiolib_init:gpio初始化

         s3c24xx_init_uarts:初始化串口

         s5p_reserve_bootmem 

           media_devs = smdkc110_media_devs;

           nr_media_devs = ARRAY_SIZE(smdkc110_media_devs)=10;

           为传进来的元素从boot_mem分配一定的内存

         s3c_device_nand.name = "s5pv210-nand";

         s5p_device_rtc.name = "smdkc110-rtc"

              

         

posted @ 2019-11-18 21:51  根叔~  阅读(316)  评论(0编辑  收藏  举报