NIOSV firmware stuck when juart-terminal is not open for the print messasges.

Hello,

This is not usual behavior, the default shouldn't behave like this. Are you having prints into the terminal? If you remove such prints the programs continues?

Which Quartus version are you using? Which NIOSV version (G,C,M)?

Please provide as much details as possible so I can reproduce

~E.V.

Could you please verify what is written here?

https://www.intel.com/content/www/us/en/docs/programmable/683130/21-4/driver-options-fast-vs-small-implementations-29605.html

"fast" version of the driver shouldn't be blocking execution.

~E.V.

When you generate BSP, go to the JUART Driver settings - there is an option to allow the driver to ignore when the output FIFO is full. Enable that option and it will not wait for somebody to read the output.

Please confirm both setings pointed out by me and @dim1

In the BSP should appear as: altera_avalon_jtag_uart_driver.enable_small_driver = false and/or altera_avalon_jtag_uart_driver.enable_jtag_uart_ignore_fifo_full_error = true

~E.V.

Hi @prashant_gohel,

Greetings, just checking in to see if there is any further doubts in regards to this matter.

Hope your doubts have been clarified.

Best Wishes

BB

Hi prashant_gohel​,

Can you try to modify the alt_sys_init.c?
Our team found that the current auto-generated initialization sequence is causing the JTAG UART fast driver to malfunction.

Current (Failing) - Nios V processor is initialized last.

void alt_sys_init( void ) 
{ 
    ALTERA_AVALON_JTAG_UART_INIT (JTAG_UART, jtag_uart); 
    INTEL_NIOSV_M_INIT (NIOS, nios); 
} 

Modified (Passing) - Nios V processor is initialized first.

  void alt_sys_init( void ) 
{ 
    INTEL_NIOSV_M_INIT (NIOS, nios); 
   ALTERA_AVALON_JTAG_UART_INIT (JTAG_UART, jtag_uart);  
} 

We believe that the JTAG UART initialization have some dependency on Nios V processor initialization.
As such, Nios V processor should be the first to initialize.

Regards,
Liang Yu

Hi prashant_gohel 

Do you still need further clarification for this case?

Regards

Jingyang, Teh

Dear Customer, 

Since no further clarification is needed on this thread, it will be transitioned to community support for further help on doubts in this thread. 

Please login to the Altera Community Forum and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions. 

Thank you for the questions and as always pleasure having you here. 

Best Wishes 

tehjingy