Seeed BeagleBone Green Wireless: U-boot cli not shown

[Darren Ng]

I cannot get the u-boot cli.

Device: BeagleBone Green Wireless
Connection: BBGW -> Serial -> PL2303 -> PC

Build:
-------------------------------------------
cd u-boot-v2020.01/
export CROSS_COMPILE='arm-linux-gnueabihf-'
export KBUILD_OUTPUT='O'
make -j3 am335x_evm_defconfig
make -j3 all
-------------------------------------------

ls -lh u-boot-v2020.01/O/spl/u-boot-spl.bin u-boot-v2020.01/O/u-boot.bin
-------------------------------------------
-rwxr-xr-x 1 darren darren 105K Mar 24 21:19
u-boot-v2020.01/O/spl/u-boot-spl.bin
-rw-r--r-- 1 darren darren 546K Mar 24 21:19 u-boot-v2020.01/O/u-boot.bin
-------------------------------------------

Test:
-------------------------------------------
echo '
115200
-clocal
ignbrk ignpar
-icrnl -ixon -opost -isig -icanon -iexten -echo
' | xargs stty -F /dev/ttyUSB0
sx --xmodem -k -vv </dev/ttyUSB0 >/dev/ttyUSB0
u-boot-v2020.01/O/spl/u-boot-spl.bin
sx --xmodem -k -vv </dev/ttyUSB0 >/dev/ttyUSB0 u-boot-v2020.01/O/u-boot.bin
cu -l /dev/ttyUSB0 -s 115200
-------------------------------------------

After that, what I get in cu is nothing but the following
---------------------------------------------------------------
xyzModem - CRC mode, 5975(SOH)/0(STX)/0(CAN) packets, 4 retries
Loaded 764512 bytes
CCC <INFINITE 'C's>
---------------------------------------------------------------

But I want this
---------------
=>
---------------

Thanks.