Hi ShapeShifter, thank you for the comprehensive response. Indeed I'm using the YunSerialTerminal, and when set to 115200 I can see boot after bootconsole fine. But when I try to change the baud rate:
Please press Enter to activate this console.
BusyBox v1.19.4 (2016-06-01 23:26:44 CEST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
/_\ ___ /_\ ___ /_\ /\ \
/
/ /\ \ /:
| /\ \ /: | /::\ \
/ / :\ \ /:|:| | :\ \ /:|:| | /:/:\ \
/ / /::_\ /:/|:| |__ /::_\ /:/|:| |__ / :\ \
/:/__/ /:/// / |:| /_\ /:/// / |:| /_\ /:/__/ :_
:\ \ // / /|:|/ / // / /|:|/ / :\ \ / /
:\ \ :/ |:/ / :/ |:/ / :\ / /
:\ \ :_\ |: / :_\ |: / :/ /
:__\ // / / // / / : /
// // // //
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -| || | | || || |
|_____|| |||||___||| |____|
|| W I R E L E S S F R E E D O M
root@sagitta:/# ~2
/bin/ash: ~2: not found
root@sagitta:/# ~2
/bin/ash: ~2: not found
root@sagitta:/# ~~
/bin/ash: ~~: not found
root@sagitta:/#
So I downgraded from LininoIO to Linino, but same result.
I set baud to 250000, then unplugged the Lun's USB and reconnected, and now I still see boot after bootconsole except with a blank line between each line. And when I hit it goes crazy with lines scrolling by at top speed (all legible), mostly saying, "wARN: missing pipe ext". Trying ~2 has no effect.
Setting console baud back to 115200 and trying ~2 I get the "/bin/ash: ~~: not found" as above.
Maybe I need to rewrite U-Boot using tftp? Although, I'm not able to use U-Boot to set the tftp server IP.