Press CTRL+A CTRL+S transfer u-boot.img picocom -b 115200 /dev/ttyUSB0 -send-cmd "sx -vv" Plug in/power board, and wait for transfer to complete: In picocom, Press CTRL+A CTRL+S transfer u-boot-spl.bin from u-boot/spl/ Start Picocom: picocom -b 115200 /dev/ttyUSB0 -send-cmd "sx -vv" Un-power board, make sure it’s powered down Verify board is sending a string of “CCC’s”… On Debian install: sudo apt install picocom lrzsz Using v2020.10-rc3 of with the default am335x_evm_defconfig so no changes required. Hi that was a little painful, but i also got it working: Your input and suggestion are greatly appreciated. On the other hand, at the ‘ccc…’ is continuously displayed with/without Boot Button is pressed. Or what else is needed at hardware configuration level to be functional for MLO? I am wandering the clock frequency is set to 24MHZ is right? Term_exitfunc: reset failed for dev UNKNOWN: Input/output error Xmodem sectors/kbytes sent: 0/ 0kRetry 0: Timeout on sector ACK Sending u-boot.img, 6056 blocks: Give your local XMODEM receive command now. It seems to me that uart0 port is working ok under ROM, but not under the MLO. It just hungs when it trying to download u-boot.img. But I found that the MLO is successfully downloaded, and it fails to download u-boot.img (the second stage u-boot file, using YMODEM). Currently micro usb port is not working, so I trying to get uart0 going, which can confirm chip is up running ok. I am working on our production board first time.
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