How to use mipmap in etc1?

cocos2d-x
#1

can someone know why loaded ECT1 texture is - BLACK - on Android , when i try use mipmap?

	static cocos2d::Texture2D::TexParams tp = {
		GL_LINEAR_MIPMAP_LINEAR,
		GL_LINEAR,
		GL_REPEAT,
		GL_REPEAT
	};
	u_texture0->generateMipmap();
	u_texture0->setTexParameters(&tp);
	u_texture0->setAntiAliasTexParameters();