![]() ![]() strace is pretty handy also, to see the timings for system calls from a process as it runs.Bootchart - see Using Bootchart on Android.other processes are also started by /init, somewhere in there:.- home (desktop) and a few core apps.the activity manager starts core applications (which are themselves dalvik applications).2) java-based core services are initialized in ServerThread::run() in SystemServer.java.1) a library is loaded to initialize interfaces to native services, then.the system_server starts, and initializes several core services.vold - volume daemon (media volumes, as in file systems - nothing to do with audio volume).usually /init (note that other Linux systems usually start /sbin/init).the first user-space process is started.interrupts are started, and the process table is initialized.normally, this will be the kernel from the 'boot' flash partition.eventually, a kernel is loaded into RAM (usually with an initrd).it detects if a special key is held, and can launch the recovery image, or the 'fastboot' bootloader.See also Sequence of boot steps on ADP1 firmware Some links had to be fixed in the resulting html output This worked for me, though I used some tag around 4.0.4.Use repo init -b to check out the AOSP sourcetree with a tag around 2.3, then make sdk sdk_all.You need a local copy of the AOSP sourcetree, and run the usual build/envsetup.sh preparation.You may be able to reconstruct it though:.Note that the old PDK has been retracted from where it used to found below.Or, see also: kandroid copy of old Android PDK rc files is documented in a readme file in the source tree. Machine-specific initialization instructions. Instructions, while the 'init.rc' file is intended to provide the The 'init.rc' file is intended to provide the generic initialization The name of the HTC1 hardwareįor the ADP1 is 'trout', and the name of the emulator is 'goldfish'. 'init.rc' and 'init.rc', where is the name of the hardware The Android 'init' program processes two files, executing the commands it finds in them, called Processes a limited form of /etc/inittab, or a direct invocation of a shell script or small program to SomeĮmbedded Linux systems use simplified forms of these - such as the init program included in busybox, which etc/rc.d/init.d with symlinks in /etc/rc.d/rc.). (Linux desktop systems have historically used some combination of Unlike other Linux systems (embedded or otherwise), Android Initializing elements of the Android system. Re-writing flash images, directly downloading and executing an alternate kernel image, etc.Ī key component of the Android bootup sequence is the program 'init', which is a specialized program for Load a 'recovery' image (second instance of the kernel and system), or put the phone intoĪ mode where the developer can perform development tasks ('fastboot' mode), such as The bootloader on the ADP1 detects certain keypresses, which can be used to make it System flash, or performing other recovery, update, or debugging tasks. Often, the first-stage bootloader will provide support for loading recovery images to the The kernel then does the bulk of hardware,ĭriver and file system initialization, before starting up the user-space programs and applications ![]() Initialization, before loading the Linux kernel. Technically, theīootloader is outside the realm of Android itself, and is used to do very low-level system ![]() The first program which runs on any Android system is the bootloader. 4.3 Interaction of different processes on application initialization.4 Notes on the Android startup procedure. ![]()
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