Sharp SL-5500 File Manager Guide Bedienungsanleitung PDF herunterladen (Seite 19)

CHAPTER 4. LIVERAM DISKS 4.5. KEXECBOOTS

4.5 Kexecboots

4.5.1 Credits

Yuri Bushmelev, Thomas Kunze and Matthew Allum are the authors of the kexecboot.

4.5.2 Building

The OpenEmbedded (

http://www.openembedded.org

) system is used to build

kexecboot

. Please

see the “Getting Started” for this, for example at

http://wiki.openembedded.net/index.php/Getting_started

document for instructions when setting up OpenEmbedded. Please ensure that you have updated

your OpenEmbedded tree recently (do

git pull

from the openembedded / directory).

4.5.2.1 Overriding the Default Version

The default kexecboot version can be overridden by specifying a BitBake recipe ﬁle (

.bb

) when

invoking

bitbake

, or by setting the variable

PREFERRED_VERSION_linux-kexecboot

local.conf

according to [1], for example with

bitbake linux-kexecboot -b \

../openembedded/recipes/kexecboot/linux-kexecboot_2.6.32.bb

for

2.6.32

. This will build

kexecboot

with a

2.6.32

kernel. Depending on the options speciﬁed in

conf/local.conf, the kexecboot ﬁles may be written in a variety of formats.

There are other kexecboot recipe ﬁles, such as (2010):

initramfs-kexecboot-image.bb

kexecboot-cfg_0.1.bb

kexecboot_git.bb

linux-kexecboot_2.6.21-hh20.bb

linux-kexecboot_2.6.24.bb

linux-kexecboot_2.6.26.bb

linux-kexecboot_2.6.29.bb

linux-kexecboot_2.6.32+2.6.33-rc3.bb

linux-kexecboot_2.6.32.bb

More speciﬁcally, the

bitbake

process consists of downloading and building the cross-

compiler toolchain, native toolchain and kernel, and building the cpio-format initramfs image

(

linux-kexecboot-image

) for the

kexecboot

system. This image is used as a ramdisk-based root

ﬁlesystem, and its purpose is to mount one or more ﬁlesystems, locate the replacement kernel (and

root ﬁlesystem) and call the kexecboot kernel routine to replace the kernel.

Before the kernel is built, any patches are downloaded and applied, depending on the machine

type which is selected. The kernel image is compressed and written, along with the initramfs

ﬁlesystem.

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