4.0.8 - can't pxeboot to install x86_64 guest, similar to case 2536

[google]

Can't gpxe boot x86_64 guest like Centos5, menu could not be loaded. After changing it to 32bit OS, then gpxe boot would work, but it means gpxe boot could not be supported with x86_64 guest.

Logs shown below:

... 00:00:01.256 CPUMSetGuestCpuIdFeature: Enabled sysenter/exit 00:00:01.257 CPUMSetGuestCpuIdFeature: Enabled PAE 00:00:01.257 CPUMSetGuestCpuIdFeature: Enabled LONG MODE 00:00:01.257 CPUMSetGuestCpuIdFeature: Enabled syscall/ret 00:00:01.257 CPUMSetGuestCpuIdFeature: Enabled LAHF/SAHF 00:00:01.257 CPUMSetGuestCpuIdFeature: Enabled NXE 00:00:01.257 HWACCM: 32-bit and 64-bit guests supported. 00:00:01.257 HWACCM: VMX enabled! 00:00:01.257 HWACCM: Enabled VPID 00:00:01.257 HWACCM: enmFlushPage 0 00:00:01.257 HWACCM: enmFlushContext 1 00:00:01.257 HWACCM: TPR Patching disabled. 00:00:01.257 HWACCM: Using the VMX-preemption timer (cPreemptTimerShift=0) 00:00:01.257 HWACCM: VT-x/AMD-V init method: LOCAL 00:00:01.259 VM: Halt method global1 (5) 00:00:01.260 HaltedGlobal1 config: cNsSpinBlockThresholdCfg=125000 00:00:01.261 Changing the VM state from 'CREATING' to 'CREATED'. 00:00:01.261 Changing the VM state from 'CREATED' to 'POWERING_ON'. 00:00:01.262 AIOMgr: Endpoints without assigned bandwidth groups: 00:00:01.263 AIOMgr: C:\Ubuntu\centos5.vdi 00:00:01.264 Changing the VM state from 'POWERING_ON' to 'RUNNING'. 00:00:01.268 Guest Log: BIOS: VirtualBox 4.0.8 00:00:01.269 PIT: mode=2 count=0x10000 (65536) - 18.20 Hz (ch=0) 00:00:01.276 ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={09eed313-cd56-4d06-bd56-fac0f716b5dd} aComponent={Display} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false 00:00:01.295 AHCI ATA: Ctl: RESET, DevSel=0 AIOIf=0 CmdIf0=0x00 (-1 usec ago) CmdIf1=0x00 (-1 usec ago) 00:00:01.296 ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={09eed313-cd56-4d06-bd56-fac0f716b5dd} aComponent={Display} aText={Could not take a screenshot (VERR_NOT_SUPPORTED)}, preserve=false 00:00:01.296 AHCI ATA: Ctl: finished processing RESET 00:00:01.297 Guest Log: BIOS: ata2-0: PCHS=16383/16/63 LCHS=1024/255/63 00:00:01.298 PIT: mode=2 count=0x48d3 (18643) - 64.00 Hz (ch=0) 00:00:01.308 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000008530000 w=640 h=480 bpp=32 cbLine=0xA00, flags=0x1 00:00:01.725 2D video acceleration is disabled. 00:00:03.774 PIT: mode=2 count=0x10000 (65536) - 18.20 Hz (ch=0) 00:00:03.775 Guest Log: BIOS: Booting from LAN... 00:00:03.782 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000000000000 w=720 h=400 bpp=0 cbLine=0x0, flags=0x1 00:00:03.785 Guest Log: BIOS: * int 15h function AX=d04f, BX=4f43 not yet supported! 00:00:05.807 Guest Log: BIOS: * int 15h function AX=d04f, BX=4f43 not yet supported!