TTL中断不了

z789

移动GM220-S，怎么中断不了？看输出有Hit 1 to upgrade software versionHit any key to stop autoboot:  0

TTL输出：
Boot NAND
C

U-Boot 2013.04-svn10471 (Jul 19 2019 - 18:27:45)

CPU  : ZX279127@A9,800MHZ
Board: zxic zx279127evb
DRAM:  256 MiB
com1
NAND:  NAND_special nand special:0

Manu ID: 0xc8, Chip ID: 0xda (ESMT NAND 256MiB 3,3V 8-bit)
256 MiB
<nand_read_skip_bad_,1308>!mtdpart=0x4,offset=0x580000,mtdpartoffset=0x4200000,mtdPartsize=0x600000,length=0xc
[INFO] ZXIC_SOFT_VID:33685505
product_vid = 66
vid=66-F627
output gpio:1, value=1, 0
<nand_read_skip_bad_,1308>!mtdpart=0x1,offset=0x0,mtdpartoffset=0x180000,mtdPartsize=0x80000,length=0x20000
In:    serial
Out:   serial
Err:   serial
clk_pll env is not setted, core clk won't change
Net:   addr 0x94000008 before value is f9ff1fcf
addr 0x94000008 after value is ffff1fcf
serdes init done
init fe_phy first!
innerGeLedPolarSet 0
eth0

Hit 1 to upgrade software version
Hit any key to stop autoboot:  0
do_mcupg function enter..
mac 4 phy status changed: 10M half-duplex
-----smac_init


回车 任意键什么的都不行，一直在跑动
应该是中兴代工的，
请教下各位怎么处理？谢谢