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Why is the main part of the kernel image only 1.5 MB in RAM after boot?

According to this picture from the kernel boot process : RAM contents after boot loader is done

The main part of the kernel image is only ~ 1.5 MB. I thought that the kernel image should be a large binary image file in order to support hardware (or is it a kernel module?) And various kernel functions, since the source is quite large. Also, where initrd?

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​​. ​​ . initrd , /boot (. grub) , . initrd . RAID, LVM , . ext2/3/(4?). , , initrd (pivot_root). "none initrd", udev.

, !

P.S. , !

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