ipxe -> symantec pxe chain

[NiKiZe]

I would never say that anything is "the same" between legacy PCBIOS and EFI, it is so much that is different on so many levels.
What is Symantec actually booting?
Maybe it is just Linux?

If so than in EFI it might be shim->grub->kernel, in that case just do iPXE->kernel instead
In pcbios mode maybe it is pxelinux instead

You might want to take a look on the server and see if you can find configuration files, textfiles, or anything else in the files that tells you what it actually is.
Is there any place where these files can be downloaded? maybe as a demo or something?