ESX 4.0 USB install

Found quite a few posts on different things but not precisely pure USB install.
so we follow instructions from here: http://blog.laspina.ca/ubiquitous/creating-usb-based-boot-media-for-esx-4-installs

but contents of syslinux.cfg will be following:

default menu.c32
prompt 0
timeout 9000
menu title ESX 4 USB Install

label Default
kernel vmlinuz
append initrd=initrd.img vmkopts=debugLogToSerial:1 mem=512M quiet askmedia