Re: [Xenomai-help] [RTnet-users] RTNet in non-TDMA mode?

[Roland Tollenaar <rwatollenaar@domain.hid>]

>> between RTdevices and non-RT devices crash the system? And whether I
>> understand correctly that later versions (2.4 up?) of xenomai do not
>> have the problem of the freezing system at least.?
> 
> Since Xenomai 2.3, actually, no system is supposed to "crash" anymore
> when IRQ conflicts between the domains arise. But if you loose, e.g.,
> your USB keyboard or your serial console or whatever input device due to
> a conflict, you may get the impression of a crash. However, if anyone
> suspects that something else happens on his system, please report the
> findings to the Xenomai mailing list!

The systems I have found to "crash" all used PS/2 input device and 
normal VGA monitor. Generally a freeze is initiated by some grafical 
action in X after starting rtnet. dmesg will tell me that there is a 
shared IRQ, and in some cases it will disable it. In the latter case the 
system does not freeze but I still have to find another IRQ address. 
When there is a shared interrupt then there might be a freeze. If it 
does not freeze immediately it never freezes and the shared IRQ is no 
problem. For a while I thought there was only a problem with the VGA 
device and the rtnet card so if I kept those two off the same IRQ there 
would be no problem. On other machines this theory was brutally smashed.
Sorry I cannot be more specific here since all problems in the end are 
"solved".

Hmm, I am just considering that since I use live linux it may be that 
the conflict was between the rtnet card and a USBport that gives access 
to the usbstick(s).

But my question remains -purely out of interest- why non-rt devices and 
rt devices can _fundamentally_ not share an IRQ?

kind

regards,

Roland.



> 
> Jan
>