September 2016
Intermediate to advanced
989 pages
24h 10m
English
Content preview from Embedded Linux for DevelopersBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating a boot ramdisk
A Linux boot ramdisk, strictly speaking, an initial RAM filesystem or initramfs, is a compressed cpio archive. cpio is an old Unix archive format, similar to TAR and ZIP but easier to decode and so requiring less code in the kernel. You need to configure your kernel with CONFIG_BLK_DEV_INITRD to support initramfs.
In fact, there are three different ways to create a boot ramdisk: as a standalone cpio archive, as a cpio archive embedded in the kernel image, and as a device table which the kernel build system processes as part of the build. The first option gives the most flexibility because we can mix and match kernels and ramdisks to our hearts content. However, it means that you have two files to deal with instead of one ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.