After connecting the serial port, U boot keep loading the image with error for system halt.
U-Boot 2010.06-svn64409 (Jul 01 2021 - 08:52:03)
Hit ctrl+u to stop autoboot: 0
Mounting yaffs2 mount point/partnum: nand/0
Configures yaffs mount nand success!
Copy /nand/uImage to 0x42000000...