How do I boot without initrd?

How do I boot without initrd?

Booting the Linux Kernel Without an initrd/initramfs

1. Remove initrd/initramfs support from the linux kernel.
2. Remove UUIDs from kernel command line parameters and /etc/fstab .
3. Build all modules into the linux kernel.
4. Tell the bootloader where root is located and what filesystem it’s using.

Is initrd required?

initrd/initramfs is optional and not a requirement. bzImage is the pure kernel image and can be booted directly by the bootloader.

What is initrd in Linux?

The initial RAM disk (initrd) is an initial root file system that is mounted prior to when the real root file system is available. The initrd is bound to the kernel and loaded as part of the kernel boot procedure. In the case of desktop or server Linux systems, the initrd is a transient file system.

How do I create an initrd image for a custom kernel?

Here is a summary of the steps:

1. Copy the resulting compiled kernel into your /boot directory using the name that resulted from your earlier changes to the Makefile. Here is an example:
2. Edit /etc/lilo.
3. Make a new initial ramdisk, initrd image (see the section called Making an initrd image) if needed.
4. Run /sbin/lilo.

What is the point of initrd?

In computing (specifically as regards Linux computing), initrd (initial ramdisk) is a scheme for loading a temporary root file system into memory, which may be used as part of the Linux startup process.

How is a kernel made?

The open-source NASM, or the Net-Wide Assembler, will assemble the assembly code into a file format called object code. The object file generated is an intermediate step to produce the executable binary or program. All object code (created from your ASM and C files) will form bits and pieces of your kernel.

What is difference between Initrd and Initramfs?

Both initrd and ramfs are zipped at compile time, but the difference is, initrd is a block device unpacked to be mounted by the kernel at booting, while ramfs is unpacked via cpio into memory.