[Xenomai-help] Functional difference between tty and xterm?

[Xenomai-help] Functional difference between tty and xterm?

[Brian Zenowich]

Hello,

I am using kernel 2.6.20.14 with Xenomai 2.3.1 and the Peak CAN driver 
6.4. This is the only combination I can get to coexist peacefully. I 
have tried 20.18/2.3.3 and 22.9/2.4rc3 but the former fails xeno-test, 
and the latter hangs on boot when loading the Peak driver.

I have a Core2 Duo. Kernel SMP is enabled. SMI/ACPI/APM is all 
configured to make Xenomai happy. User-space Xenomai was NOT configured 
with --enable-smp.

My ncurses-based program runs well from the tty (as root), but if I 
'startx' and try to run my program from an xterm window (still as root), 
it hangs the machine at the moment it calls CAN_Init(). CAN_Init() is 
essentially a call to rt_dev_open("/dev/pcan0", 0_RDWR). I am using a 
PCI CAN card.

I am able to launch my program from the tty, then switch to a new tty 
and startx from there. If I switch back to my program's tty, it is still 
humming along.

Do you have any thoughts as to what is the difference (from a Xenomai 
user-space program's point of view) between running in a tty and running 
in an xterm?

Why would the rt_dev_open() call work from a tty, but not in an xterm?

Thanks for any insight you might have,

-Brian Z.

Re: [Xenomai-help] Functional difference between tty and xterm?

[Brian Zenowich]

Nevermind. Adding "Option NoAccel True" to xorg.conf (i810 driver) fixed 
it. I thought this was just to reduce latencies. I didn't realize I 
couldn't even access my CAN card without it!

Thanks,

-Brian Z.

Brian Zenowich wrote:
> Hello,
> 
> I am using kernel 2.6.20.14 with Xenomai 2.3.1 and the Peak CAN driver 
> 6.4. This is the only combination I can get to coexist peacefully. I 
> have tried 20.18/2.3.3 and 22.9/2.4rc3 but the former fails xeno-test, 
> and the latter hangs on boot when loading the Peak driver.
> 
> I have a Core2 Duo. Kernel SMP is enabled. SMI/ACPI/APM is all 
> configured to make Xenomai happy. User-space Xenomai was NOT configured 
> with --enable-smp.
> 
> My ncurses-based program runs well from the tty (as root), but if I 
> 'startx' and try to run my program from an xterm window (still as root), 
> it hangs the machine at the moment it calls CAN_Init(). CAN_Init() is 
> essentially a call to rt_dev_open("/dev/pcan0", 0_RDWR). I am using a 
> PCI CAN card.
> 
> I am able to launch my program from the tty, then switch to a new tty 
> and startx from there. If I switch back to my program's tty, it is still 
> humming along.
> 
> Do you have any thoughts as to what is the difference (from a Xenomai 
> user-space program's point of view) between running in a tty and running 
> in an xterm?
> 
> Why would the rt_dev_open() call work from a tty, but not in an xterm?
> 
> Thanks for any insight you might have,
> 
> -Brian Z.
> 
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help

Re: [Xenomai-help] Functional difference between tty and xterm?

[Jan Kiszka]

[-- Attachment #1: Type: text/plain, Size: 509 bytes --]

Brian Zenowich wrote:
> Nevermind. Adding "Option NoAccel True" to xorg.conf (i810 driver) fixed 
> it. I thought this was just to reduce latencies. I didn't realize I 
> couldn't even access my CAN card without it!

That it avoids crashes is new to me as well. If you have a bit time,
please try to attach a serial console (see
linux/Documentation/serial-console.txt) and check if you get some oopses
when you leave the option out. That may help us to find the underlying
reason.

Thanks,
Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 249 bytes --]