initrd

This initrd image name is what I used in previous steps; it may differ from what you used.

Other than cross-compilation, the concepts (as they apply to initrd construction) are the same for an embedded target.

Edit your initrd image to let the root file system adapter driver load earlier than all other storage adapter drivers.

This file, like the traditional Linux boot process, is invoked when the initrd image is decompressed into the RAM disk.

The initrd is bound to the kernel and loaded as part of the kernel boot procedure.

The cpio file format (now supported as a Fedora Core initrd image format) has a long history and operates on a wide range of UNIXes.

Once transferred, the Linux kernel can be booted and initrd mounted, as is done in a local image boot.

At this point, you have the initrd image in a block device suitable for mounting.

This initrd serves as a temporary root file system in RAM and allows the kernel to fully boot without having to mount any physical disks.

The initrd function allows you to create a small Linux kernel with drivers compiled as loadable modules.

The initrd image contains the necessary executables and system files to support the second-stage boot of a Linux system.

The initrd is also useful as a non-persistent root file system mounted in a RAM disk for embedded Linux systems.

When you're building an embedded system and want the smallest initrd image possible, there are a few tips to consider.

The initrd image is actually a RAM disk that contains a small file system with basic configuration files, binaries, libraries, and drivers.

In the case of desktop or server Linux systems, the initrd is a transient file system.

The Debian kernel image packages for ARM require an initrd for booting the system.

This will extract your initrd image to a file initrd; then you mount this file with the ext2 file system type to mount point temp.

At the mount point, you now have a directory that represents an ext2 file system that you can populate for your initrd.

Minimax is a Linux distribution that fits entirely in an initrd image!

Because there is no hard drive in many embedded systems based on Linux, the initrd also serves as the permanent root file system.

The kernel package depends on module-init-tools (which conflicts with the old modutils); initrd-tools depends on cramfsprogs.

You should be able to find all files in the initrd image under directory temp now.

In embedded systems with no mutable storage, the initrd is the permanent root file system.

When the kernel is invoked, it decompresses itself into high memory and copies the initrd for later mounting and use.

After the kernel and initrd images are decompressed and copied into memory, the kernel is invoked.

With the second-stage boot loader in RAM, the Linux kernel image and the initial RAM disk image (initrd) are loaded into RAM.

You can check the Resources section for more information on creating or customizing your own initrd image.

As in these newer Linux distributions, the initrd image is also compressed with cpio.

Rather, Cr-48's boot process is missing a pretty vital part necessary for Ubuntu's kernel to work: initrd.

To shrink the size of your initrd even further, consider using a C library alternative to glibc, such as uClibc or dietlib.

Section for more information on creating or customizing your own initrd image.

You can now interact with GRUB to define the specific kernel and initrd image to load.

The kernel (bzImage) and the initrd image (initrd. gz) are then copied to the (bootable, ext3) floppy.

Beginning with Fedora Core 3, the default initrd image is a compressed cpio archive file.

The initial RAM disk (initrd) is an initial root file system that is mounted prior to when the real root file system is available.

In order to use this method, we need to create two things, a kernel and an initrd image.

Here, initrdmp. gz is the initrd image name.

Prior to Fedora Core 3, the initrd is constructed using the loop device.

DMMP isn't build into the initrd image, so you can use following commands to do it

To tailor an existing initrd image to your own needs, see

For help in creating your own custom initrd image from scratch, see

Copy the DMMP-related binary and library to the initrd image

Listing 7. Hierarchy of major functions in initrd loading and mounting

Make a new initrd image with DMMP support

Build a new initrd image with DMMP embedded in it

Then run the following command to build DMMP into the initrd image

Run the following command to build a new initrd image with DMMP embedded

Edit the initrd image to change the storage adapter sequence