Hi3520DV300 uboot tftp 下载就重启

    新人，新手 求助uboot 现在正常，烧入内核的时候，tftp 启动后uboot 就重启了，请问这个是怎么回事？

test # mw.b 82000000 ff 400000
test # tftp 82000000 uImage_hi3521a
ETH0: PHY(phyaddr=1, rgmii) link UP: DUPLEX=FULL : SPEED=100M
MAC:   3E-67-3B-30-6B-10
OK!!!!!
TFTP from server 192.168.20.223; our IP address is 192.168.20.222
Download Filename 'uImage_hi3521a'.
Download to address: 0x82000000
Downloading:                          


U-Boot 2010.06 (Sep 29 2017 - 19:10:34)

Check Flash Memory Controller v100 ... Found
SPI Nand(cs 0) ID: 0xc2 0x12 Name:"MX35LF1GE4AB"
Block:128KB Page:2KB Chip:128MB*1 OOB:64B ECC:4bit/512
SPI Nand total size: 128MB
In:    serial
Out:   serial
Err:   serial