--- a/pkvlm-create	Thu Jan 05 15:05:38 2012 +0200
+++ b/pkvlm-create	Thu Jan 05 16:47:04 2012 +0200
@@ -211,6 +211,9 @@
 
 PRESEED_CHECKSUM= # set later
 
+# installer boot args
+INSTALL_BOOT_ARGS="auto=true priority=critical preseed/file=/cdrom/${PRESEED_NAME} preseed/file/checksum=${PRESEED_CHECKSUM} -- quiet console=ttyS0"
+
 ## External progs
 # Bootable .iso for Debian isolinux-based installer CDs
 GENISOIMAGE=/usr/bin/genisoimage

--- a/preseed/isolinux.cfg	Thu Jan 05 15:05:38 2012 +0200
+++ b/preseed/isolinux.cfg	Thu Jan 05 16:47:04 2012 +0200
@@ -10,8 +10,8 @@
 	menu label ^Install (Preseed {GUEST_NAME})
 	menu default
 	kernel /install.amd/vmlinuz
-	append vga=788 initrd=/install.amd/initrd.gz auto=true priority=critical preseed/file=/cdrom/{PRESEED_NAME} preseed/file/checksum={PRESEED_CHECKSUM} -- quiet 
 
+	append vga=788 initrd=/install.amd/initrd.gz {INSTALL_BOOT_ARGS} 
 
 
 default vesamenu.c32