Yes I have finished the kernel porting and the uboot command I used is:
console ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,fbpix=RGB666,bpp=32 video=mxcfb1:dev=ldb,fbpix=RGB666,bpp=32 video=mxcfb2:off video=mxcfb3:off vmalloc=128M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=448M galcore.contiguousSize=33554432 buildvariant=userdebug androidboot.serialno=100879d4e3167aba androidboot.soc_type=imx6qp androidboot.storage_type=sd gpt androidboot.serialno=100879d4e3167aba androidboot.soc_type=imx6qp androidboot.storage_type=sd gpt
and the display I am using is TX18D204VM0BVA.