root@host:~/u-boot-2016.11$ CROSS_COMPILE=/usr/src/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- make -j4
  CHK     include/config/uboot.release
  CHK     include/generated/timestamp_autogenerated.h
  UPD     include/generated/timestamp_autogenerated.h
  CHK     include/generated/version_autogenerated.h
  CHK     include/generated/generic-asm-offsets.h
  HOSTCC  tools/mkenvimage.o
  HOSTCC  tools/image-host.o
  HOSTCC  tools/fit_image.o
  HOSTCC  tools/dumpimage.o
  HOSTCC  tools/mkimage.o
  HOSTLD  tools/mkenvimage
  HOSTLD  tools/dumpimage
  HOSTLD  tools/mkimage
  AS      arch/powerpc/cpu/mpc85xx/start.o
  CC      cmd/version.o
  CC      common/main.o
  CC      common/board_f.o
  LD      cmd/built-in.o
  LD      common/built-in.o
  CC      lib/display_options.o
  LD      lib/built-in.o
  LD      u-boot
drivers/usb/host/built-in.o: In function `usb_lowlevel_init':
/home/aperez/u-boot-fslc-2016.11-fslc/drivers/usb/host/xhci.c:1071: undefined reference to `xhci_hcd_init'
drivers/usb/host/built-in.o: In function `usb_lowlevel_stop':
/home/aperez/u-boot-fslc-2016.11-fslc/drivers/usb/host/xhci.c:1107: undefined reference to `xhci_hcd_stop'
lib/built-in.o: In function `fdtdec_setup':
/home/aperez/u-boot-fslc-2016.11-fslc/lib/fdtdec.c:1192: undefined reference to `_end'
Makefile:1207: recipe for target 'u-boot' failed
make: *** [u-boot] Error 1
root@host:~/u-boot-2016.11$ grep -r xhci_hcd_init
drivers/usb/host/xhci.h:int xhci_hcd_init(int index, struct xhci_hccr **ret_hccr,
Binary file drivers/usb/host/xhci.o matches
drivers/usb/host/xhci-fsl.c:int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
drivers/usb/host/xhci-omap.c:int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
drivers/usb/host/xhci-pci.c:int xhci_hcd_init(int index, struct xhci_hccr **ret_hccr,
drivers/usb/host/xhci-keystone.c:int xhci_hcd_init(int index,
drivers/usb/host/xhci-zynqmp.c:int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
Binary file drivers/usb/host/built-in.o matches
drivers/usb/host/xhci.c:        if (xhci_hcd_init(index, &hccr, (struct xhci_hcor **)&hcor) != 0)