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===== VirtualBox LAN boot ROM ===== You can use gPXE as the LAN boot ROM in VirtualBox. The boot ROM can be set per-VM or globally for all VMs. Using gPXE instead of the default LAN boot ROM, VMs can be booted over HTTP, iSCSI, AoE, and gPXE's other advanced features are available. === Build the ROM image === Check which network adapter is configured for the VM. The default network adapter is the **PCnet-FAST III (Am79C973)** (PCI ID 1022:2000). \\ \\ Here are the adapters supported by VirtualBox v3.1.2 [from a VirtualBox (non-GPL ed.) on Fedora 12 (i686) installation]: ^ VirtualBox Adapter 'type' ^ PCI Vendor ID ^ PCI Device ID ^ Mfr Name ^ Device Name ^ Notes ^ | Am79C970A | 1022h | 2000h | AMD | PCnet-PCI II (AM79C970A) | | | Am79C973 | 1022h | 2000h | AMD | PCnet-PCI III (AM79C973) | Default in prior versions | | 82540EM | 8086h | 100Eh | Intel | Intel PRO/1000 MT Desktop (82540EM) | **Default in v3.1.2** | | 82543GC | 8086h | 1004h | Intel | Intel PRO/1000 T Server (82543GC) | | | 82545EM | 8086h | 100Fh | Intel | Intel PRO/1000 MT Server (82545EM) | | | virtio | 1AF4h | 1000h | Qumranet? | Paravirtualized Network (virtio-net) | | \\ Build the appropriate ROM image: cd gpxe/src make bin/10222000.rom # for pcnet32 1022:2000 === Fix up the ROM image === VirtualBox has the following requirements on ROM image size: - Size must be 4K aligned (i.e. a multiple of 4096) - Size must not be greater than 64K Check that your image is not larger than 65536 bytes: $ ls -l bin/10222000.rom | awk '{print $5}' 55296 Pad the image file to a 4K boundary: $ python >>> (55296 + 4095) & ~4095 # Round up to 4K aligned size 57344 >>> 57344 - 55296 # Calculate padding size 2048 >>> f = open('bin/10222000.rom', 'a') >>> f.write('\0' * 2048) # Pad with zeroes === Configure the VM to use the LAN boot ROM === Use **vboxmanage** to set the **LanBootRom** path: vboxmanage setextradata $VM_NAME VBoxInternal/Devices/pcbios/0/Config/LanBootRom /path/to/10222000.rom Replace **$VM_NAME** with your VM's name. If you use "global" as **$VM_NAME** then all VMs will use the gPXE LAN boot ROM. Now start the VM and press F12 to choose network booting: virtualbox -startvm $VM_NAME To automatically boot gPXE, change the VM boot priorities to try booting from the network first. === Unconfiguring the VM === If you wish to stop using gPXE: vboxmanage setextradata $VM_NAME VBoxInternal/Devices/pcbios/0/Config/LanBootRom


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