小米路由器3A怎么刷breed？ttl有，但无法输入，如下：
按1-9都不行DDR Calibration DQS reg = 00008787
U-Boot 1.1.3 (Jul 25 2018 - 03:19:13)
Board: Ralink APSoC DRAM:64 MB
Power on memory test. Memory size= 64 MB...OK!
relocate_code Pointer at: 83fa8000
RT2880_RSTSTAT_REG 0xc0030000
***************************
Board power on Occurred
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flash manufacture id: ef, device id 40 18
find flash: W25Q128BV
env is right!
============================================
Ralink UBoot Version: 4.3.0.0
--------------------------------------------
ASIC 7628_MP (Port5<->None)
DRAM component: 512 Mbits DDR, width 16
DRAM bus: 16 bit
Total memory: 64 MBytes
Flash component: SPI Flash
Date:Jul 25 2018Time:03:19:13
============================================
icache: sets:512, ways:4, linesz:32 ,total:65536
dcache: sets:256, ways:4, linesz:32 ,total:32768
##### The CPU freq = 575 MHZ ####
estimate memory size =64 Mbytes
RESET MT7628 PHY!!!!!!
Please choose the operation:
1: Load system code to SDRAM via TFTP.
2: Load system code then write to Flash via TFTP.
3: Boot system code via Flash (default).
4: Entr boot command line interface.
5: Load common filesystem then write to Flash via TFTP.
7: Load system code via web.
9: Load Boot Loader code then write to Flash via TFTP.
n3: System Boot system code via Flash.
Booting System 1
Erasing SPI Flash...
raspi_erase: offs:30000 len:10000
.
Writing to SPI Flash...
.
done
## Booting image at bc180000 ...
Image Name: MIPS OpenWrt Linux-3.10.14
Image Type: MIPS Linux Kernel Image (lzma compressed)
Data Size: 1425851 Bytes =1.4 MB
Load Address: 80000000
Entry Point:80000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
commandline uart_en=0 factory_mode=0 mem=64m root=/dev/mtdblock9
No initrd
## Transferring control to Linux (at address 80000000) ...
## Giving linux memsize in MB, 64
Starting kernel ...
LINUX started...
THIS IS ASIC
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.10.14 (jenkins@dea8cc7a4bde) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #1 MiWiFi-R3A-2.18.40 Thu Nov 1 11:25:58 UTC 2018
[ 0.000000]
如果键盘无法输入，应该是路由的Tx到TTL板的Rx通路断了，如接错、线断等等
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