RE: [RFT] PXE chainloader

[Turner, Ian]

> Attached patch may help. I noticed that last file may still remain opened.

This works fine for me when chainloading PXELINUX or grub2 itself. But it fails 
when chainloading the Solaris 10 U8 pxegrub. Specifically, we are doing PXE -> 
Grub 2 -> pxegrub. pxegrub generates some output as follows:

Server: <correct IP address>
Site Option 150: <garbage>
BootFile: <bytes 1641-2049 of Grub 2's grub.cfg file>

Pxegrub then attempts to use the garbage above as a TFTP filename, which of 
course doesn't work. Also, note that we do not use site option 150 in our DHCP 
environment.

Note that chainloading PXE -> Grub 2 -> PXELINUX -> pxegrub generates exactly 
the same problem above as chainloading PXE -> Grub 2 -> pxegrub, but 
chainloading PXE -> PXELINUX -> pxegrub (i.e., without Grub 2) works just fine.

Cheers,

--Ian