This is probably obvious but insofar as the livecd toolset is used to produce a pxe booted image (as with the stock livecd-iso-to-pxeboot script or a hacked variant), the relevant serial console options can be appended to the  append line  in the relevant stanza of the pxeboot file.  For example here is an excerpted stanza from the "default" file in my /var/lib/tftpboot/linux-install/pxelinux.cfg directory:

LABEL pxelive
  KERNEL vmlinuz0
  APPEND initrd=initrd0.img,iso.cpio.gz root=/livecd.iso rootfstype=iso9660 rootflags=loop selinux=0 console=ttyS0,57600n8


On Fri, Aug 8, 2008 at 12:35 PM, Alan Pevec <apevec@redhat.com> wrote:
Bryan Kearney wrote:
I am seeing the append flag being used by the appliance creator. Any reason to (1) not use appliance creator or (2) ignore this in livecd tools?

ad (1) oVirt Node image is normal livecd image, while appliance-creator produces disk image
ad (2) this clearly a livecd-tools bug which needs to be fixed



--
Michael G. Prisant,
Durham, NC