The following boards were test in this release

numaker-som-ma35d16a81
numaker-iot-ma35d16f70
numaker-iot-ma35d16f90

Using repo to download source

$ repo init -u https://github.com/OpenNuvoton/MA35D1_Yocto-v3.1.3.git -m meta-ma35d1/base/ma35d1.xml
$ repo sync

NOTE:

1.Probably you will get server certificate verification failed
Solve it in the following way: 
	export GIT_SSL_NO_NOTIFY=1
	or
	git config --global http.sslverify false

2.The setting of the board can be modified at sources/meta-ma35d1/conf/machine/<machine>.conf

Build yocto

DISTRO=nvt-ma35d1-directfb MACHINE=numaker-som-ma35d16a81 source sources/init-build-env build

Usage:

MACHINE=<machine> DISTRO=<distro> source sources/init-build-env <build-dir>
<machine>    machine name
<distro>     distro name
<build-dir>  build directory

Step by step to build yocto

To build and use the yocto, do the following:

$ repo init -u https://github.com/OpenNuvoton/MA35D1_Yocto-v3.1.3.git -m meta-ma35d1/base/ma35d1.xml
$ repo sync
$ DISTRO=nvt-ma35d1-directfb MACHINE=numaker-som-ma35d16a81 source  sources/init-build-env build
( Set the device tree of arm-trusted-firmware and the device tree of kernel according to the board
  in source/meta-ma35d1/conf/machine/*.conf )
$ bitbake core-image-minimal