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

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

[-- Attachment #1: Type: text/plain, Size: 2027 bytes --]

Roland Tollenaar wrote:
>>> 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 

If there is a conflict with your graphic adapter, using a VESA X driver
or disabling acceleration (Option "NoAccel") should remove the need to
use the related IRQ under Linux.

> 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


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 252 bytes --]