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serial port & XMODEM


I'm playing with a little board linked to my laptop through the serial port.
I discovered that I could update the board BIOS using the XMODEM protocol to 
upload the new version.

I've installed the comms/lrzsz port and I've read its man page. I've also read 
the cu man page, but it's not clear to me how I can use the serial console to 
enter the BIOS setup and, after that, use XMODEM to send the new BIOS.

Any suggestion ?