thanks! That's the problem.
But the LX2160 burn command needs to be modified,Otherwise, the firmware will not burn successfully.
Then deploy them on FlexSPI 1 with the following command.
=> tftp 0xa0000000 firmware_lx2160ardb_uboot_xspiboot.img
=> sf probe 0:0
=> sf erase 0 +$filesize && sf write 0xa0000000 0 $filesize
=> reset