siehe http://doc.ubuntu.com/edubuntu/handbook/C/ltsp-theory.html
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Boot ROM
Depending on your network card, it may already contain a boot ROM, or you may be able to use an EPROM programmer to create your own. Check the hardware documentation for the network card in your thin client for details.
Etherboot
Etherboot is a very popular open-source bootrom project. It contains drivers for many common network cards, and works very well with LTSP.
ROM images suitable for booting from floppy, CD-ROM, etc., can be obtained from http://www.rom-o-matic.org
Linux kernels must be tagged with the mknbi-linux, which will prepare the kernel for network booting, by prefixing the kernel with some additional code, and appending the initrd to the end of the kernel.
The kernels that are supplied with Edubuntu/LTSP are already tagged, and ready to boot with Etherboot.
PXE
Part of the 'Wired for Management' specification from the late 1990's included a specification for a bootrom technology known as the Pre-boot Execution Environment commonly abbreviated as PXE.
A PXE bootrom can load at most a 32 kilo-byte file. A Linux kernel is quite a bit larger than that. Therefore, we setup PXE to load a 2nd stage boot-loader called pxelinux. pxelinux is small enough to be loaded, and it knows how to load much larger files, such as a Linux kernel.
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Gruß
Reinerr