Initramfs is a root filesystem image used for booting the kernel, which is provided as a compressed cpio archive. It can be prepended with an uncompressed cpio archive containing microcode data.
Initrd and initramfs are two different methods of loading a temporary root file system into memory, which are used to make preparations before the real root file system can be mounted.
Initramfs is based on tmpfs, which is a size-flexible, in-memory lightweight file system and does not use a separate block device.
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Initramfs is used as the first root filesystem that your machine has access to. It is used for mounting the real rootfs which has all your data. The initramfs carries the modules needed for mounting your rootfs. But you could always compile your kernel to have these modules.
Initramfs - Ubuntu Wiki
Building an initramfs If you do decide to build an initramfs, the following scripts will provide a basis to do it. The scripts will allow specifying a rootfs ...
The basic initramfs is the root filesystem image used for booting the kernel provided as a compressed cpio archive.
This basic initramfs image may be prepended with an uncompressed cpio archive holding the microcode data loaded very early in the boot process.
initramfs - Debian Wiki
Initrd and initramfs are two different methods of loading a temporary root file system into memory, to be used as part of the Linux startup process. Initrd is a file system image that is made available in a special block device that is then mounted as the initial root file system, while initramfs is a cpio archive that is unpacked by the kernel into a special instance of a tmpfs that becomes the initial root file system. Both methods are commonly used to make preparations before the real root file system can be mounted.
Initial ramdisk - Wikipedia
An initramfs is an initial ram file system based on tmpfs (a size-flexible, in-memory lightweight file system), which also did not use a separate block device (so no caching was done and all overhead mentioned earlier disappears).
Initramfs/Guide - Gentoo Wiki
The “initramfs” error can affright you, but luckily this error has a very easy and straightforward solution. This error occurs when your memory got ...
How Do I Start Ubuntu From Initramfs?
initramfs An initramfs ( init ial ram f ile s ystem) is used to prepare Linux systems during boot before the init process starts.
initramfs - Gentoo Wiki
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Custom Initramfs - Gentoo Wiki