accessing u-boot with picocom to transfer files via serial interface

October 8, 2010

[Warning: This post is a backup recovery from my previous Wordpress blog. All content was automatically converted accessing a MySQL database using a Python script (details). Mostly are in Portuguese but if you are interest I can translate to English. If you found any problem dont’t hesitate to contact me in comments.]

There is a how-to with minicom too, this is using picocom to transfer files via serial interface (ymodem). First start with some parameters, in this case I'm using ttyUSB0.

$ picocom --baud 115200 --send-cmd="sb -vv" --receive-cmd="rb -vvv" /dev/ttyUSB0

Then:

U-Boot > loady
## Ready for binary (ymodem) download to 0x90800000 at 115200 bps...

Type C-a C-s and choose the file.

*** file: /tftpboot/uImage
sb -vv /tftpboot/uImage
Sending: uImage
Ymodem sectors/kbytes sent:   0/ 0kRetry 0: NAK on sector
Retry 0: NAK on sector
Bytes Sent:2203904   BPS:7800
Sending:Transfer complete*** exit status: 0
0(STX)/0(CAN) packets, 6 retries
## Total Size      = 0x0021a0e4 = 2203876 Bytes
U-Boot >

The sb and rb utility are on lrzsz package [ $sudo apt-get install lrzsz ]

** Other reference