[U-Boot] Question about dfu flash rootfs image

Hi All, Now I am implementing DFU support on Atmel sama5d3xek board, when try to download rootfs image to NAND flash through DFU, we need to drop ffs from rootfs image. In dfu_nand.c when it call nand_write_skip_bad() with flags as 0. However, I need to call nand_write_skip_bad() with flags at least with WITH_DROP_FFS set.

Till now, I don't find any good solution to pass the parameter, except hard code it or through "#ifdef CONFIG_CMD_NAND_TRIMFFS" to set it. Any suggestions for it and any other solution?

Best Regards, Bo Shen