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三、U-boot的使用
命令：
loadb - load binary file over serial line (kermit mode)
loadx - load binary file over serial line (xmodem mode)
loady - load binary file over serial line (ymodem mode)
功能：以不同的协议从串口获取文件.。
格式基本都为：
load？ [ off ] [ baud ]
第1个参数是下载到SDRAM的地址，如果不填，就是用默认配置：CONFIG_SYS_LOAD_ADDR
第2个参数是波特率，一般不填，用默认的115200.
在windows下的超级终端可以用这些协议发送文件，但是在ubuntu下基本只能用kermit协议。一下使用C-kermit来发送一个文件到mini2440。 [u-boot@MINI2440]# loadb
## Ready for binary (kermit) download to 0x30008000 at 115200 bps... |
上面已经启动了U-boot的kermit传输协议，这时按下 Ctrl + \ , 再按 c, 切换到C-kermit的命令行模式，输入命令：send <文件路径>，回车。 [u-boot@MINI2440]# loadb
## Ready for binary (kermit) download to 0x30008000 at 115200 bps...
(Back at MAGI-Linux)
----------------------------------------------------
C-Kermit 8.0.211, 10 Apr 2004, for Linux
Copyright (C) 1985, 2004,
Trustees of Columbia University in the City of New York.
Type ? or HELP for help.
(/home/tekkaman/桌面/) C-Kermit>send/home/tekkaman/development/share/zImage.img |
C-kermit就开始传送，并且显示一个传送界面，并动态显示传送进度。
C-Kermit 8.0.211, 10 Apr 2004, MAGI-Linux
Current Directory: /home/tekkaman/��~L�~]�
Communication Device: /dev/ttyUSB0
Communication Speed: 115200
Parity: none
RTT/Timeout: 01 / 02
SENDING: /home/tekkaman/development/share/zImage.img => zImage.img
File Type: BINARY
File Size: 2277540
Percent Done: 19 /////////-
...10...20...30...40...50...60...70...80...90..100
Estimated Time Left: 00:03:35
Transfer Rate, CPS: 8536
Window Slots: 1 of 1
Packet Type: D
Packet Count: 557
Packet Length: 1000
Error Count: 0
Last Error:
Last Message:
X to cancel file, Z to cancel group, <CR> to resend last packet,
E to send Error packet, ^C to quit immediately, ^L to refresh screen. |
传送完毕后，输入c ，回到U-boot的串口界面。
[u-boot@MINI2440]# loadb
## Ready for binary (kermit) download to 0x30008000 at 115200 bps...
(Back at MAGI-Linux)
----------------------------------------------------
C-Kermit 8.0.211, 10 Apr 2004, for Linux
Copyright (C) 1985, 2004,
Trustees of Columbia University in the City of New York.
Type ? or HELP for help.
(/home/tekkaman/桌面/) C-Kermit>send/home/tekkaman/development/share/zImage.img
(/home/tekkaman/桌面/) C-Kermit>c
Connecting to /dev/ttyUSB0, speed 115200
Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------
## Total Size = 0x0022c0a4 = 2277540 Bytes
## Start Addr = 0x30008000 |
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