How to create Apollo-lake IFWI.bin for coreboot coding use

Dear all,

    I bring up Apollo lake +DDR-3L board, use Coreboot + Intel FSP,

https://firmware.intel.com/projects/minnowboard3

MinnowBoard
3 0.62 Binary Object Modules (ZIP file; for use with EDK II source project)

I use above file to build coreboot, but have below issue, have any one can teach me,

How to craet the ifwi file? Thanks.

ifwitool:
/home/james/CC2/coreboot/util/cbfstool/ifwitool.c:532: bpdt_validate_header:
Assertion `h->signature == (0x000055AA)' failed.

James