猫盘ttl刷机，按回车不能中断是为什么

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用得ch341编程器，用xshell访问，可以看到跑内容，但无论怎么按回车就是不能出现输入命令的情况。
9 |4 M& D) b( v' y& p$ W" L* [具体跑内容如下，求指导
; ~$ H8 i( k. \) m1 W*** Warning - bad CRC, using default environment

: ~5 G5 S8 k9 c- x) [& VMMC:   for ssg ledsdhci@d8000: 0
( R+ ?8 d) @' l" Kÿ** File not found boot/armada-3720-customer0-minifs.dtb **
' F4 H+ d4 E. Q5 ^+ A$ X12931 bytes read in 8 ms (1.5 MiB/s)
3 T  Q$ v( }% \7 \3 U' o9 ~12931 bytes read in 3 ms (4.1 MiB/s)
: i( ]% L1 i+ X" u, j5 G) w: jComphy-0: USB3_HOST0    5 Gbps   
Comphy-1: SGMII0        1.25 Gbps
& G) ^) W5 d! h) U/ ZComphy-2: SATA0         6 Gbps   
gpio: pin GPIO23 (gpio 39) value is 1
) S1 j  r+ R+ V( V( x** File not found boot/armada-3720-customer0-minifs.dtb **
12931 bytes read in 3 ms (4.1 MiB/s)
; A; [: `+ u6 U4 d: }Enter Normal mode
. j) R, ^+ r: \" q  ~  V3 qSCSI:  Hit any key to stop autoboot:  0
gpio: pin GPIO221 (gpio 57) value is 0
+ R9 n6 h) x4 p3 p% W! u7 w. ?, Wÿÿ즰io: pin GPIO221 (gpio 57) value is 1
gpio: pin GPIO20 (gpio 36) value is 1

" |: b3 d% @# f4 h# i, ^

$ k4 Z) ~) y+ I* \/ l2 L