1. Please create two partitions with Linux command "fdisk", one 1G FAT16 and 2G one ext2/ext3 or with remainder of the available disk size.
# mkfs.vfat /dev/sdb1
# mkfs.ext2 /dev/sdb2
2. Please deployed RCW + PBI + BL2(bl2_<boot_mode>.pbl)image to SD card as the following.
dd if=bl2_sd.pbl of=/dev/sdb bs=512 seek=8
note:/dev/sdb is SD device name.
Please deploy TF-A FIP image at 0x00800 in SD card.
dd if=fip_uboot.bin of=/dev/sdb bs=512 seek=0x800
Please deploy FMAN ucode at 0x04800 in SD card.
dd if=fsl_fman_ucode_ls1043_r1.1_106_4_18.bin of=/dev/sdb bs=512 seek=0x4800
you can't find /dev/sdb2