XU4 have a 2GB RAM so we can incrase CFG_FASTBOOT_TRANSFER_BUFFER_SIZE e.g 1536MB > #define CFG_FASTBOOT_TRANSFER_BUFFER_SIZE (0x60000000) https://github.com/hardkernel/u-boot/blob/88af53fbcef8386cb4d5f04c19f4b2bcb69e90ca/include/configs/odroid_xu4.h#L164