CAN RX FIFO overrun

[dberenguer]

Hi all.

I'm having serious problems with the can4linux (3.0) driver running on my DNP5282 board. Bus loads over 4% always cause CAN RX buffer overruns.

Does anyone have the same problem?
Should I try with a newer driver?
Has this to do only with the can4linux port for MCF5282? Other MCF5282 users talk about a bunch of bugs on can4linux for this platform.

Thanks in advance,

Daniel.

[dberenguer]

Nobody else had this problem?

Which version of can4linux are you running?

Thanks,

Daniel.

[jne]

Hi Daniel,

with which bit rate do you work and what is the expected bus load?

Did you check that the debug option is out?

Regards,
Jörg

[dberenguer]

Hi Jörg,

The bit rate is 250 kbps. The debug option is OFF. The bus load oscillates between 0.5% and 9%.

Correction: the version of can4linux was 3.4 not 3.0.

Besides, /sys/class/Can/Overrun always show 0 even if I know that some incomming messages are lost.

Thank you very much for your help,

Daniel.

[dberenguer]

Hi again,

I'm currently looking into my kernel config and I have for CAN:

CONFIG_CAN4LINUX=m
# CONFIG_CAN_ATCANMINI is not set
# CONFIG_CAN_CCPC104 is not set
# CONFIG_CAN_MCF5282 is not set
# CONFIG_CAN_CPC_PCI is not set
# CONFIG_CAN_IME_SLIMLINE is not set

Shouldn't CONFIG_CAN_MCF5282 be enabled (Coldfire FlexCan I guess)? I mean:

CONFIG_CAN4LINUX=y
CONFIG_CAN_MCF5282=y

I've heritated this config file from another project that was supposed to have CAN and I don't find a good reference in the net about how to configure the kernel for the MCF5282.

On the other hand, my DNP5282 module is configured in the kernel as

# Processor

CONFIG_M5280=y
# CONFIG_M5282 is not set
CONFIG_COLDFIRE=y
...

# Platform
CONFIG_DNP5280=y
CONFIG_SSV=y
...

Again, I'm a little confused here.

Thanks again for your help,

Daniel.

[dberenguer]

With these settings:

CONFIG_CAN4LINUX=y
CONFIG_CAN_MCF5282=y

and making the uClinux image + can4linux 3.4.6 I get a lot of
"undefined reference to `__this_module'" errors on drivers/char/can4linux

I guess this post
http://www.ssv-comm.de/forum/viewtopic.php?t=461&highlight=thismodule
talks about a possible solution but my german is not good

Any idea out there?

Thanks in advance,

Daniel.