[poky] how to set u-boot in meta-machine

[tab]

Hi,
I'm going to build a linux distro for LeMaker Guitar with yocto project 
and I've meet some problems, hope you can help me:
  I refer this 
page(http://www.yoctoproject.org/docs/2.1/bsp-guide/bsp-guide.html) to 
build a layer named 'meta-guitar' with a custom
kernel source (https://github.com/LeMaker/linux-actions).
It seems nothing wrong during the building time and i get a 
'meta-guitar' successfuly.
But when i try to build a image with `bitbake core-image-minimal` i get 
a error:

ERROR: u-boot-v2016.03+gitAUTOINC+df61a74e68-r0 do_compile: oe_runmake 
failed
ERROR: u-boot-v2016.03+gitAUTOINC+df61a74e68-r0 do_compile: Function 
failed: do_compile (log file is located at 
/home/tab/work/yocto/build/guitar/tmp/work/guitar-poky-linux-gnueabi/u-boot/v2016.03+gitAUTOINC+df61a74e68-r0/temp/log.do_compi
le.16108)

and the logfile says: Configuration file ".config" not found.

It seems that I need to do something with the u-boot while building the 
meta-guitar?
But there's no more info about the u-boot while I'm building 
meta-guitar, such as the path of the u-boot source file?
  How can i solve this problem?
  Hope for your help.

Tab Liu
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