# 示例:pxe-service=x86PC, "Install Linux", pxelinux (读取 pxelinux.0 文件并执行)
# pxe-service...=x86PC, "Install Linux", pxelinux, 1.2.3.4(不适用于老的PXE)
# 整数,PXE 客户端将通过广播或者通过 <server...pxe-service=IA64_EFI, "Now in IA64_EFI mode", IA64_EFI
# pxe-service=Alpha, "Now in Alpha mode...0
# pxe-service=X86-64_EFI, "Now in X86-64_EFI (UEFI mode)", grub/grub-x86_64.efi
# pxe-service...=Xscale_EFI, "Now in Xscale_EFI mode", Xscale_EFI
# pxe-service=BC_EFI, "Now in BC_EFI mode",