This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PROCESSOR-SDK-AM64X: AM64x-SK getting started process in SDK not working

Part Number: PROCESSOR-SDK-AM64X
Other Parts Discussed in Thread: UNIFLASH

I am following the getting started instructions in the mcu_plus_sdk_am64x_08_06_00_43 to get started with the AM64x-SK EVM.  Mys progress so far:

1. I was able to get the serial connection to my Linux (Ubuntu 20.04) machine.  I followed the instructions to use Uniflash to flash the SOC initialzation binary.  Here is teh output from my attempt:

python3 uart_uniflash.py -p /dev/ttyUSB3 --cfg=sbl_prebuilt/am64x-sk/default_sbl_null.cfg

Parsing config file ...
Parsing config file ... SUCCESS. Found 2 command(s) !!!

Executing command 1 of 2 ...
Found flash writer ... sending sbl_prebuilt/am64x-sk/sbl_uart_uniflash.release.tiimage
Sent flashwriter sbl_prebuilt/am64x-sk/sbl_uart_uniflash.release.tiimage of size 321775 bytes in 31.41s.

Executing command 2 of 2 ...
Command arguments : --file=sbl_prebuilt/am64x-sk/sbl_null.release.tiimage --operation=flash --flash-offset=0x0
Sending sbl_prebuilt/am64x-sk/sbl_null.release.tiimage: 0%| | 0/271879 [00:00<?, ?bytes/s]send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'2'
send error: expected NAK, CRC, EOT or CAN; got b'4'
send error: expected NAK, CRC, EOT or CAN; got b'a'
send error: expected NAK, CRC, EOT or CAN; got b'a'
send error: expected NAK, CRC, EOT or CAN; got b'2'
send error: expected NAK, CRC, EOT or CAN; got b'e'
send error: expected NAK, CRC, EOT or CAN; got b'c'
send error: expected NAK, CRC, EOT or CAN; got b'c'
send error: expected NAK, CRC, EOT or CAN; got b'6'
send error: expected NAK, CRC, EOT or CAN; got b'a'
Sending sbl_prebuilt/am64x-sk/sbl_null.release.tiimage: 0%| | 2/271879 [00:00<48:32, 93.34bytes/s]
[ERROR] XMODEM send failed, no response OR incorrect response from EVM OR cancelled by user,
Power cycle EVM and run this script again !!!

As shown, the file was sent over the serial link, but the response from the EVM was not correct.  I also tried flashing from an SD card,but I newver saw the consoleoutput as described in the SDK, so this may not ahve worked.

I tried SD card initialization, but never saw any console output. What else should I try?