Linux freeze JTAG problem

Altera_Forum · ‎08-17-2011

Hi all,

I've got a problem on my board. Whereas I selected in Device Drivers-> Character devices -> Serial drivers :

[*] Bypass output when no connection

My uClinux freeze after 5 minutes of perfectly running.

When I plug the JTAG and do a " nios2-terminal " on my computer, all the " dmesg " is printed on the console and the uClinux comes backs to life.

It looks like a fifo full and as soon as I empty the the fifo everything is fine.

Does anybody got an idea ?

Thanks in advance.

Altera_Forum · ‎08-18-2011

I didn't found what to do ...

Does anybody can help me. Nobody got this problem ?

Thanks

Altera_Forum · ‎08-25-2011

JTAG serial ports having this type of problems. xilinx does the same without linux also. the option "Bypass output when no connection" should actually solve this problem, I do not know.

Altera_Forum · ‎08-25-2011

Thank you neolux.

Does a Guru have solution for my problem ?

Thanks

Altera_Forum · ‎08-25-2011

I just ran into this problem too. It works most of the time, when only the normal boot messages get printed to the console. But if something happens that prints out a lot of messages, such as the OOM killer, Linux hangs until I connect with a nios2-terminal. I'm looking through the altera_jtaguart source to try to track down the problem, but any help would be appreciated.

Altera_Forum · ‎08-26-2011

Please tell me what solution did you found to solve this problem !

Thanks

Altera_Forum · ‎09-06-2011

Nobody has an idea ?

Altera_Forum · ‎09-06-2011

Hello guys,

i had this problem either but without using uCLinux.

The same problem appears when using the µC/OS-II operating system.

There the problem lies within the altera hal.

I could fix it, using the following defines symbols (for the preprocessor):

ALTERA_AVALON_JTAG_UART_BUF_LEN=8192

This increases the buffer.

And within the source-code i used this ioctl to setup the non-blocking mode:

fcntl(STDOUT_FILENO, F_SETFL, O_NONBLOCK);

fcntl(STDERR_FILENO, F_SETFL, O_NONBLOCK);

I don't know if this sollution can be ported to uCLinux?!

Altera_Forum · ‎09-23-2011

I was running into this problem with JTAG, and Linux wouldn't boot from flash without a console, so I am now using a netconsole to work around the problems.

menuconfig > Device Driver > Network Device Support > Network console logging support

see linux-2.6/Documentation/networking/netconsole.txt

Altera_Forum · ‎09-26-2011

nice I will check !

Thanks ykozlov