![]() ![]() alarm manager: It lets userspace tell the kernel when it would like to wake up.oom handling: It kills processes as available memory becomes low.It holds the machine awake on a per-event basis until the wake lock is released. wakelocks: It is used for power management files.logger: This is the kernel support for the logcat command.pmem: “Process memory allocator”: It is used to manage large (1–16+ MB) physically contiguous regions of memory shared between userspace and kernel drivers.It is a new shared memory allocator, similar to POSIX SHM but with different behavior and sporting a simpler file-based API. Binder: It is an Android-specific interprocess communication mechanism and remote method invocation system.Here’s a list of changes/addons that the Android Project made to the Linux kernels:. What is the difference between the Linux and Android kernels? When the kernel finishes the system setup, it looks for “init” in the system files. As the kernel launches, it starts to setup cache, protected memory, scheduling, and loads drivers. The Android kernel starts in a similar way as the Linux kernel. Primary Boot Loader will load Secondary Boot Loader from a specific sector on the disk, then Secondary Boot Loader will initialize the system and load the kernel from ‘boot’ flash partition into RAM. This legacy loader contains 2 important files:ġ- Init.s :: Initializes stacks, zeros the BSS segments and call_main() in main.c 2- Main.c:: Initializes hardware (clocks, board, keyboard, console) and creates Linux tags The bootloader can be found at: /bootable/bootloader/legacy/usbloader Primary Boot Loader and Secondary Boot Loader. The bootloader is usually split into stages. The bootloader usually lives on the system board in non-volatile memory and is often specific to a device. The bootloader is a low-level code contains the instructions that tell a device how to start up and find the system kernel. The bootloader is code that is executed before any Operating System starts to run. On pressing the POWER button, the Boot ROM code starts executing from a predefined location which is hardwired in ROM. Above Image showing 5 stages of Booting process for an Android-powered device: ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |