Android 根文件系统启动分析

核心提示：/*打开console，如果cmdline中没有指定的console则打开默认的/dev/console*/ if (console[0]) { snprintf(tmp, sizeof(tmp), "/dev/%s", console); console_name = strdup(tmp); }

/*打开console，如果cmdline中没有指定的console则打开默认的/dev/console*/ if (console[0]) { snprintf(tmp, sizeof(tmp), "/dev/%s", console); console_name = strdup(tmp); } fd = open(console_name, O_RDWR); if (fd >= 0) have_console = 1; close(fd); /*读取/initlogo.rle(一张位图)，如果成功则在/dev/graphics/fb0 显示Logo,如果失败则将/dev/tty0 *设为TEXT模式并打开/dev/tty0,输出文本ANDROID(本人修改为Zhao Rui Jia做为启动项目的修改)。 */ if( load_565rle_image(INIT_IMAGE_FILE) ) { fd = open("/dev/tty0", O_WRONLY); if (fd >= 0) { const char *msg; msg = " " " " " " " " " " " " " " // console is 40 cols x 30 lines " " " " " " " " " " " " " " /*" A N D R O I D ";*/ " z h a o R u i J i a"; write(fd, msg, strlen(msg)); close(fd); } } /* 判断cmdline 中的??，并设置属性系统中的参数: * 1、 如果 bootmode为 * - factory,设置ro.factorytest值为1 * - factory2,设置ro.factorytest值为2 * - 其他的韵ro.factorytest值?0 * 2、如果有serialno参数，则设置ro.serialno，否则为"" * 3、如果有bootmod参数，则设置ro.bootmod，否则为"unknown" * 4、如果有baseband参数，则设置ro.baseband，否则为"unknown" * 5、如果有carrier参数，则设置ro.carrier，否则为"unknown" * 6、如果有bootloader参数，则设置ro.bootloader，否则为"unknown" * 7、通过全局变量(前面从/proc/cpuinfo中提取的)设置ro.hardware和ro.version。 */ if (qemu[0]) import_kernel_cmdline(1); if (!strcmp(bootmode,"factory")) property_set("ro.factorytest", "1"); else if (!strcmp(bootmode,"factory2")) property_set("ro.factorytest", "2"); else property_set("ro.factorytest", "0"); property_set("ro.serialno", serialno[0] ? serialno : ""); property_set("ro.bootmode", bootmode[0] ? bootmode : "unknown"); property_set("ro.baseband", baseband[0] ? baseband : "unknown"); property_set("ro.carrier", carrier[0] ? carrier : "unknown"); property_set("ro.bootloader", bootloader[0] ? bootloader : "unknown"); property_set("ro.hardware", hardware); snprintf(tmp, PROP_VALUE_MAX, "%d", revision); property_set("ro.revision", tmp); /*执行所有触发标识为init的action。*/