It saves vars in ${DEPLOY_DIR_IMAGE}/<image>.qemuboot.conf, and runqemu
will read it.
The bsp which can be boot by runqemu will inherit it.
(From OE-Core rev: 1675e9b89e00b875d0da13411a2a939aa4ba5298)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>