Prebuilt gPXE images are available from http://rom-o-matic.net/. Images can be generated from official gPXE releases or from the current development tree. This is probably the easiest way to get started with gPXE.
You can browse the current development tree at http://git.etherboot.org/?p=gpxe.git, or check out a copy using:
git clone git://git.etherboot.org/scm/gpxe.git
To update your checked out copy at any time, use:
git pull
If you do not have git installed, you can download a tarball of the current development snapshot of gPXE from http://git.etherboot.org/?p=gpxe.git;a=snapshot or, a tarball of the most recent official release from http://etherboot.org/rel/gpxe/ or http://kernel.org/pub/software/utils/boot/gpxe/.
A separate repository is kept for useful gPXE extensions and patches that have not been sufficiently tested and reviewed to be merged into gPXE mainline. See the staging page if you'd like to help us test them.
A complete build of gPXE or Etherboot requires the syslinux and mtools packages in your development environment. syslinux is required in order to create ISO images. On RedHat/Fedora systems you can install these packages using:
sudo yum install syslinux mtools
You can then do a complete build of gPXE using:
cd gpxe/src make
Centos 5 / Fedora 11 Notes
You may need to set the value in the line 59 of src/arch/i386/Makefile correctly (/usr/share/syslinux/isolinux.bin), apparently the reference to /usr/lib/syslinux/isolinux.bin is incorrect, this has not been tested in other distros. ISOLINUX_BIN config has been missing for a while.
Source code for Etherboot 5.4 (our legacy bootloader, in maintenance-only mode) is available at http://git.etherboot.org/?p=etherboot.git.
The source code for older Etherboot releases is available from http://sourceforge.net/project/showfiles.php?group_id=4233&package_id=4250