same config for uefi and legacy

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Finally I completely redo my ipxe server and it works with the same script ...
Here it is:

kernel wimboot
initrd BCD BCD
initrd boot.sdi boot.sdi
intird BOOT.WIM BOOT.WIM

The only difference is the boot.wim file which is in uppercase. It is true that the one that is contained in the iso of my winpe is written in uppercase.
I guess the problem came from there ...