How to build console-image with hardware vfp disabled

By default, console-image build has the following config. How do I disable callconvention-hard, I struggled, but not find a solution.

Build Configuration:
BB_VERSION = “1.20.0”
BUILD_SYS = “x86_64-linux”
NATIVELSBSTRING = “Fedora-20”
TARGET_SYS = “arm-angstrom-linux-gnueabi”
MACHINE = “beagleboard”
DISTRO = “angstrom”
DISTRO_VERSION = “v2013.12”
TUNE_FEATURES = “armv7a vfp thumb neon callconvention-hard”
TARGET_FPU = “vfp-neon”
meta-angstrom = “angstrom-v2013.12-yocto1.5:0a7a04f5bd79bd9bba71a4d46f53a4e519ec820e”

Thanks!

Kai