这个问题的根源在于rx一般是需要接3.3v拉高的，而rax120却通过一个电阻接到了gnd上拉低，这样就造成了你的任何输入都不会传进cpu.
ttl从右到左为gnd、rx、tx、vcc，电阻从右到左为rx、rx-gnd、tx、vcc电容，我们需要拆除rx-gnd这个电阻.
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IPQ807x# pri
baudrate=115200
bootargs=console=ttyMSM0,115200n8
bootcmd=mii write 0x4 0x0 0x800; sleep 1; nmrp; echo Loading DNI firmware for checking...; loadn_dniimg 0 0x1980000 0x44000000; calc_rootadd 0x1980000 0x44000000; iminfo 0x44000000; if test $? -ne 0; then echo linux checksum error; fw_recovery; fi;iminfo $rootfs_addr_for_fw_checking; if test $? -ne 0; then echo rootfs checksum error; fw_recovery; fi;nand read 0x44000000 0x1980000 0x06400000; dnibootm
bootdelay=2
eth1addr=bc:a5:11:2d:11:5b
eth2addr=bc:a5:11:2d:11:5c
eth3addr=ff:ff:ff:ff:ff:ff
eth4addr=31:30:33:37:31:39
eth5addr=33:30:35:46:38:31
ethact=eth0
ethaddr=bc:a5:11:2d:11:5a
fdtcontroladdr=4a959a30
ipaddr=192.168.1.1
machid=8010000
netmask=255.255.255.0
serverip=192.168.1.10
stderr=serial@78B3000
stdin=serial@78B3000
stdout=serial@78B3000
Environment size: 845/262140 bytes
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