This directory builds gPXE option ROMs from the gPXE source
tarball. We provide this tarball in our source so that the option ROMs
can be reconstructed from source, allowing easier debugging and
fulfilling the terms of the GPL.

We make a few non-standard settings, most to do with timeouts and when
to give up, and for stricter DHCP spec compliance.

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Since gPXE upstream do not appear to distribute tarballs, we
generated one ourselves with the following runes (to extract the tree
as on 25th September 2008):

 git clone git://git.etherboot.org/scm/gpxe.git
 cd gpxe
 git archive --format=tar --prefix=gpxe/ c24bc349ead939d90b5784dbff3cd9fdb9d83ba8 | gzip >../gpxe-git-snapshot.tar.gz

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Previously, an image from Rom-o-matic.net was provided here, fetched
from the following URL:

http://rom-o-matic.net/5.4.3/build.php?version=5.4.3&F=ignore&nic=rtl8139%3Artl8139+--+%5B0x10ec%2C0x8139%5D&ofmt=Binary+ROM+Image%28.zrom%29&arch=i386&ASK_BOOT=-1&BOOT_FIRST=BOOT_NIC&BOOT_SECOND=BOOT_NOTHING&BOOT_THIRD=BOOT_NOTHING&BOOT_INDEX=0&STATIC_CLIENT_IP=&STATIC_SUBNET_MASK=&STATIC_SERVER_IP=&STATIC_GATEWAY_IP=&STATIC_BOOTFILE=&EXIT_ON_FILE_LOAD_ERROR=on&DHCP_CLIENT_ID=&DHCP_CLIENT_ID_LEN=&DHCP_CLIENT_ID_TYPE=&DHCP_USER_CLASS=&DHCP_USER_CLASS_LEN=&ALLOW_ONLY_ENCAPSULATED=on&DEFAULT_BOOTFILE=&CONGESTED=on&BACKOFF_LIMIT=7&TIMEOUT=180&TRY_FLOPPY_FIRST=0&EXIT_IF_NO_OFFER=on&TAGGED_IMAGE=on&ELF_IMAGE=on&PXE_IMAGE=on&DOWNLOAD_PROTO_TFTP=on&COMCONSOLE=0x3F8&CONSPEED=9600&COMPARM=0x03&PXE_EXPORT=on&CONFIG_PCI=on&CONFIG_ISA=on&BUILD_ID=&PCBIOS=on&PXE_DHCP_STRICT=on&A=Get+ROM

The mkhex script in tools/firmware/hvmloader will make the header file
from the downloaded image.