This BSP offers only one variant, the imx7. This variant supports
the i.MX 7Dual processor and the i.MX 6UL/ULL processor family
(with slightly different clock settings). The basic hardware
initialization is not performed by the BSP. A boot loader with
device tree support must be used to start the BSP, e.g. U-Boot or
barebox. https://docs.rtems.org/branches/master/user/bsps/arm/imx.html