[Fedora-livecd-list] Livecd trouble with PXE booting

Hi all, I use the livecd tools to build PXE boot images; the details of how things are built can be found at https://github.com/puppetlabs/razor-el-mk if you're curious. I use the tools on Fedora 19; when I last built around 11/20/2013, the resulting kernel and initrd can be successfully booted on my laptop in a KVM VM. I rebuilt the PXE boot images today, and they fail to boot successfully in the same setup. The input to the build process is virtually unchanged (I added a couple lines to a %post in the kickstart to blacklist the mei kernel module) When I boot the ISO file that I built, everything works as expected; when I boot the kernel/initrd that livecd-iso-to-pxeboot created from that ISO, either via PXE or via direct kernel boot, dracut times out waiting for /dev/mapper/live-rw to show up. There is only one entry 'vda' in /sys/block, corresponding to the virtual disk attached to the VM. The command line I use to boot is rootflags=loop initrd=initrd0.img root=live:/microkernel.iso rootfstype=auto ro rd.live.image acpi=force rd.luks=0 rd.md=0 rd.dm=0 rd.info=1 Running 'isoinfo -d' against the ISO confirms that the ISO has the label 'microkernel' - I've also tried 'root=CDLABEL=microkernel' on hte kernel command line, to no avail. It looks like the kernel does not recognize the ISO appended to the normal initrd. Does anybody have any ideas how I can debug this further ? Has anybody successfully built pxe boot images with livecd-tools-19.8-1.fc19.x86_64 ? David