We don't have steps for building the mfgtool firmware in buildroot. I would still suggest you to use yocto to build the mfgtool firmware.
FYI.
https://community.nxp.com/t5/i-MX-Processors/Build-mfgtool-firmware-uboot/m-p/820176
We don't have steps for building the mfgtool firmware in buildroot. I would still suggest you to use yocto to build the mfgtool firmware.
FYI.
https://community.nxp.com/t5/i-MX-Processors/Build-mfgtool-firmware-uboot/m-p/820176