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Hi,all how to set ''extra'' parameter of xen configuration file? I found several format in this parameter, such as: extra = "text ks=nfs:192.168.1.254:/disk1/yum/centos5/ks.xen.centos5.txt" or extra = "headless ip=dhcp method=nfs:129.158.218.44:/mnt lang=en_US keymap=us ksdevice=eth0" Is there a specification to show how to edit this parameter, and to