linux kernel not seen from android filesystem?

Question

I'm reading 'embedded linux' and in chp.6 "filesystems" there is a figure that I do not understand.



enter image description here



here it says that the 'linux kernel' is not seen from android filesystem. This give me some confusion:



-> The linux kernel image is definitely stored in a storage attached to the device. So when this figure says 'not seen from the android target filesystem', does this imply that the filesystem seen from the 'linux kernel' and 'android framework' is different?



In other words, if the kernel is to do its job, it needs to be able to see and access all the files available to the system. On the other hand, since android is practically a 'user' from kernel view, its scope is limited? And it does not have access to the actual linux kernel image due to this reason?


— kwagjj | Sources

Answer

The linux kernel for an android device will be built separately from the vanilla AOSP.
Of course, one can configure to include the build of linux kernel inside the Android build process.



The kernel will be compiled and compressed into an image along with the ramdisk image. This is essentially what constitutes the boot.img which will be placed in the boot partition.



BTW there are several partitions divided inside whatever storage is used for the target android device.



While the linux kernel resides in the boot partition inside the boot.img, the android system will be stored in system.img which will be located in the system partition.



For a typical android build, the root account is inaccessible to the user(android system). Thus, a typical android user will not be able to check out the root directory.


— kwagjj | Sources

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