wimboot Custom boot.wim

[ssd]

I've also had problems getting ipxe to load large images.
I looked at the wimboot source, and it is expecting the files in a cpio archive. A little experimentation with options to get the format right, and I found this to work:

echo bootmgr BCD boot.sdi boot.wim | fmt -1 | cpio -H newc -v -o > ../wimfiles.cpio

Then I used ipxe to boot syslinux, and syslinux to load wimboot as kernel and wimfiles.cpio as initrd

This loads quite fine...not as convenient as using ipxe directly, but it works. So at least i know it's not wimboot getting it wrong.

Maybe syslinux is getting the memory map more correct or something.
However, even with this method, some machines (with limited memory) don't work, where the same files loaded as a bootable iso instead of a wim with wimboot works, so it probably needs double the memory or something.