iPXE as a chain-load target

[thecoda]

So I moved to lpxelinux 6.02. It doesn't quite get me the theming I was after from grub2, but the vesamenu support is "good enough" for now.

I can't get any response from ipxe at all, and no mention of the iso in my http server logs.
Despite trying almost every possible permutation of:
- loading ipxe.lkrn from TFTP
- loading ipxe.lkrn from HTTP (possible with lpxelinux)
- direct to sanboot from the syslinux config: "APPEND dhcp && sanboot http://server/hiren.iso"
- direct-to-shell from the syslinux config: "APPEND shell"
- putting the sanboot command in an ipxe script
- trying the script both with and without the "#!ipxe" header
- trying the script both with and without "dhcp"
- trying the syslinux config both with and without "dhcp &&"