This document outlines the required storage files information for iMX8m Arm Cortex Complex
Required files
nand - eMMC NAND
block_size: 512
blocks: 31250000
max: 16000000000 bytes
nand_flash0 - raw NAND (chip select 0)
block_size: 2048
blocks: 67584
max: 138412032 bytes
Note: Includes 4M for ECC
nand_flash1 - raw NAND (chip select 1)
block_size: 2048
blocks: 67584
max: 138412032 bytes
Note: Includes 4M for ECC
Find out more at the NXP website.