iPXE wasn't compiled.

[HoRangKi]

I can compile pxe-boot to use usb. but it wasn't run.
My notebook(real machine) is rebooted infinite.
I still don't understand, why wasn't run.

[build machine information]
$ uname -a
Linux bw-VirtualBox 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ ll /dev/disk/by-id/
Totals 0
drwxr-xr-x 2 root root 200 1월 25 12:02 ./
drwxr-xr-x 5 root root 100 1월 25 12:02 ../
lrwxrwxrwx 1 root root 9 1월 25 10:27 ata-VBOX_CD-ROM_VB2-01700376 -> ../../sr0
lrwxrwxrwx 1 root root 9 1월 25 10:27 ata-VBOX_HARDDISK_VB444533e4-25a6cacf -> ../../sda
lrwxrwxrwx 1 root root 10 1월 25 10:27 ata-VBOX_HARDDISK_VB444533e4-25a6cacf-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 1월 25 10:27 ata-VBOX_HARDDISK_VB444533e4-25a6cacf-part2 -> ../../sda2
lrwxrwxrwx 1 root root 10 1월 25 10:27 ata-VBOX_HARDDISK_VB444533e4-25a6cacf-part5 -> ../../sda5
lrwxrwxrwx 1 root root 9 1월 25 12:02 usb-Sandisk_USB_Ultra_VC0482150712210757000233-0:0 -> ../../sdb
lrwxrwxrwx 1 root root 10 1월 25 12:02 usb-Sandisk_USB_Ultra_VC0482150712210757000233-0:0-part3 -> ../../sdb3
lrwxrwxrwx 1 root root 10 1월 25 12:02 usb-Sandisk_USB_Ultra_VC0482150712210757000233-0:0-part4 -> ../../sdb4

$ git clone http://github.com/ipxe/ipxe ipxe-src
$ cd ipxe-src/src
$ make
$ make bin/ipxe.usb
$ sudo dd if=bin/ipxe.usb of=/dev/disk/by-id/usb-Sandisk_USB_Ultra_VC0482150712210757000233-0:0
$ qemu-system-i386 /dev/sdb -boot n <--- success

[target machine information]
$ lscpi -s 02:00.0 -nnn
Network Controller [0200] : Qualcomm Atheros AR92856 Wireless Network Adapter (PCI-Express) [168C:002B] (rev 01)

Why wasn't it booted in real machine?