dir3060 u-boot console from image boot

Image1: OK Image2: OK

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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.
   6: System Enter UBoot to Update Img or Bin.
   7: Load Boot Loader code then write to Flash via Serial.
   9: Load Boot Loader code then write to Flash via TFTP.
default: 3

You choosed 4
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4: System Enter Boot Command Line Interface.

U-Boot 1.1.3 (Apr 25 2019 - 14:47:34)
MT7621 #
MT7621 # ifconfig
Unknown command 'ifconfig' - try 'help'
MT7621 # help
?       - alias for 'help'
bootm   - boot application image from memory
go      - start application at address 'addr'
help    - print online help
loadb   - load binary file over serial line (kermit mode)
md      - memory display
mdio   - Ralink PHY register R/W command !!
mm      - memory modify (auto-incrementing)
nand    - nand command
nm      - memory modify (constant address)
printenv- print environment variables
reset   - Perform RESET of the CPU
saveenv - save environment variables to persistent storage
setenv  - set environment variables
tftpboot- boot image via network using TFTP protocol
version - print monitor version
MT7621 # printenv
bootcmd=tftp
bootdelay=1
baudrate=57600
ethaddr="00:AA:BB:CC:DD:10"
ipaddr=192.168.0.1
serverip=192.168.0.101
stdin=serial
stdout=serial
stderr=serial
Image1Stable=1
BootType=3

Environment size: 177/4092 bytes
MT7621 #