AM5746: AM5746 UART Booting

Hello Keerthy,

I did looked at the link you provided and found some relevant info about what I want to achieve.

I tried to use it but with no success.

Thus, let me rephrase what I want to do achieve:

I would like to boot the AM5748 processor on my Industrial Development Kit board via UART.

I have found, following the link you gave me, which refers to Processor SDK Linux 06_03_00_106 document section, the following write-up:

3.1.1.10.1. Booting U-Boot from the console UART

In some cases we support loading SPL and U-Boot over the console UART. You will need to use the spl/u-boot-spl.bin and u-boot.img files to boot. As per the TRM, the file is to be loaded via the X-MODEM protocol at 115200 baud 8 stop bits no parity (same as using it for console). SPL in turn expects to be sent u-boot.img at the same rate but via Y-MODEM. An example session from the host PC, assuming console is on ttyUSB0 and already configured would be and the lrzsz package is installed

$ sx -kb /path/to/u-boot-spl.bin < /dev/ttyUSB0 > /dev/ttyUSB0
$ sx -kb --ymodem /path/to/u-boot.img < /dev/ttyUSB0 > /dev/ttyUSB0

So, I have modified the SYSBOOT pad resistors to provide only UART peripheral booting and as the result I can see some output (some charaters) on the J19 USB connector connected to my Linux box where it is monitored by the putty when I power up the IDK board, which I take as the ASIC ID message, beaing sent by ROM code.

What I realy need to understand is how to get the XMODEM transmission to succeed.

Here is what I curretnly do:

• Setup the UART port on my Linux box:
  sudo stty -F /dev/ttyUSB1 115200 cs8 -parenb -cstopb -ixon
  
• Power up the IDK board
  
  
• Execute the sx command from above, which should enable the transver of the u-boot-spl.bin file:
  $ sx -kb Logging/u-boot-spl.bin < /dev/ttyUSB1 > /dev/ttyUSB1
  
• The immedate output of the above command is:
  Sending Logging/axu-boot-spl.bin, 864 blocks: Give your local XMODEM receive command now.
  
  I do not quite understand what the "Give your local XMODEM receive command now" is refering to as I would expect 'the receive command' should come from the ROM code sent via UART3 from IDK.
  
  
• After some time of about ~15-20 sec, the following printed and the command exits:
  Retry 0: Receiver Cancelled
  
  Transfer incomplete
  
  

I would really appreciate if somone can provide some instruction of how to acheive what was descritber in the 3.1.1.10.1. Booting U-Boot from the console UART section I quoted above.

Regards,

Bud Miljkovic