# always build/rebuild initrd
build_initrd
+ # build iso image
rm -f $ISO
mkisofs -o $ISO -R -allow-leading-dots -J -r -b isolinux/isolinux.bin \
-c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \
$CD_ROOT/usr
+
+ # build usb image and make it bootable with syslinux (instead of isolinux)
+ USB_IMAGE=${ISO%*.iso}.usb
+ USB_KB=$(du -kc $ISO $CD_ROOT/usr/isolinux | awk '$2 == "total" { print $1 }')
+ mkfs.vfat -C $USB_IMAGE $USB_KB
+ mkdir -p $INITRD_MOUNT
+ mount -o loop,rw $USB_IMAGE $INITRD_MOUNT
+ cp -a $ISO $INITRD_MOUNT
+ cp -a $CD_ROOT/usr/isolinux/{initrd.gz,kernel,message.txt,pl_version} $INITRD_MOUNT
+ cp -a $CD_ROOT/usr/isolinux/isolinux.cfg $INITRD_MOUNT/syslinux.cfg
+ umount $INITRD_MOUNT
+ rmdir $INITRD_MOUNT
+ syslinux $USB_IMAGE
}
function burn()