Connect board to PC and open minicom. Boot board and enter U-Boot command line mode. Then run command "dnw <download address>" in U-Boot. U-Boot may print bellow message:
Insert a OTG cable into the connector!
OTG cable Connected!
Now, Waiting for DNW to transmit data
Now, you can download your file to board by follow command on PC end:
$ sudo dnw file_to_download
The downloading speed tested is about 3.8M/S.
Notes:
Above steps have only downloaded file to board's RAM, so you need flash it to nand via U-Boot command "nand write" .
If above doesn't work, pls check if you can see bellow message in dmesg.
usb 1-1: new full speed USB device using uhci_hcd and address 2
usb 1-1: configuration #1 chosen from 1 choice
secbulk:secbulk probing...
secbulk:bulk out endpoint found!
minicom 的详细介绍：请点这里
minicom 的下载地址：请点这里
相关阅读：
Ubuntu 串口工具minicom使用 及 DNW镜像烧录