What is IMAGE_SDI definition (option) turned on for ?

[NiKiZe]

Introduction of SDI was in commit https://git.ipxe.org/ipxe.git/commitdiff...9bccd8e058 which also contains relevant description.

If you populate the sdi filesystem with all the data it might be possible, however that will probably be larger than the wim.
the normal boot.sdi we can find for win vista and later is just a minimal clean memory filesystem that the .wim is then virtually extracted on.

The linked http://msdn.microsoft.com/en-us/library/ms838543.aspx seems to be relevant.
Just to be clear, don't expect to be able to use this with anything other than Win XP SP1,2,3

But if you play with it, let us know what you find.