Re: [Xenomai-help] CP-118U RTDM Driver

[Jan Kiszka <jan.kiszka@domain.hid>]

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DOURNES Guillaume wrote:
> Hi,
> 
>  
> 
> I have a kernel 2.6.20.9 with Xenomai 2.3.4.
> 
> I chose a Moxa CP-118U board on my project, to be able to drive this PCI board with the xeno_16550A module.
> 
> So I tried to drive one port of this board by calling :
> 
>  
> 
> modprobe mxser
> 
> rmmod mxser
> 
> modprobe xeno_16550A ioaddr=0xb500 irq=5
> 
>  
> 
> And I run my simple software of test.
> 
>  
> 
> But when the task is started, my computer become very slow, as a process eats a lot of CPU load.
> 
> This state stay even if I stop the software by CTRL+C, and even if I discharge the xeno_16550A module.
> 
> Only a reboot allow to go I a good state.
> 
>  
> 
> My question is why the CPU become very loaded, whereas my software do nothing.
> 

Interrupt flood? Check the system activity via /proc/xenomai/irq and
proc/xenomai/stat.

>  
> 
> I tried my software with the serial port on my mother board, and with this port, the system stay in a good state. It becomes not very slow.
> 
>  
> 
> Moreover, I contact Moxa and his response was :
> 
> "I am afraid that you cannot use 16550A module to driver CP-118U.
> 
> The reason is because we use MU860 but not 16550A in CP118U."
> 

There might be some subtle minor differences in the MU860 that causes
the existing driver to fail. Someone would have to study the mxser code
in this regard...

Jan


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