Re: RT + comedi (dual boot ubuntu 9.10/debian 7.0)

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

Hello Braud,

On Wed, Jun 26, 2013 at 03:08:51PM +0200, Braud Caroline wrote:
> I was using ubuntu 9.10 (ubuntustudio-9.10-alternate-amd64.iso) with linux-rt package.
> It was working well, I could run the Cyclictest with good RT jitters.
> Also, I was using comedi and could manage a USBDUX board and a M&C board (PCI-DAS6036).
> 
>  I needed to update my distrib for some reasons, so I did some search and found that Ubuntu does not support anymore the package linux-rt ... so I couldn't keep RT with an update version of ubuntu ...
> I installed a debian distrib in dual boot using a liveCD (debian livecd 7.0 AMD64, Gnome).
> Everthing went well and I could drive my board (PCI-DAS6036) with comedi without any problems.
> 
> Here is the structure of my disk:
> /dev/sda1 = /boot
> /dev/sda2 = /  (Unbuntu 9.10)
> /dev/sda6 = /  (debian 7.0)
> /dev/sda7 = /home 
> 
> with a common swap, home and boot for both distributions
> 
> $ sudo fdisk -l
> Disque /dev/sda : 80.0 Go, 80026361856 octets
> 255 têtes, 63 secteurs/piste, 9729 cylindres, total 156301488 secteurs
> Unités = secteurs de 1 * 512 = 512 octets
> Taille de secteur (logique / physique) : 512 octets / 512 octets
> taille d'E/S (minimale / optimale) : 512 octets / 512 octets
> Identifiant de disque : 0x000aa812
> 
> Périphérique Amorce  Début        Fin      Blocs     Id  Système
> /dev/sda1   *          63      208844      104391   83  Linux
> /dev/sda2          208845    61641404    30716280   83  Linux
> /dev/sda3        61641466   156296384    47327459+   5  Étendue
> /dev/sda5        61641468    70027334     4192933+  82  partition d'échange Linux / Solaris
> /dev/sda6        70027398   131459894    30716248+  83  Linux
> /dev/sda7       131459958   156296384    12418213+  83  Linux
> 
> 
> I was quite happy with that and I decided to boot the rt of the debian
> distribution. It was not working (it was frozen at the login stage
You're saying that Debian 7.0 works fine with the non-rt kernel, but
hangs with the -rt flavour kernel? That's the problem I suggest to
address. What means "frozen at the login stage" exactly? Does your
machine is still pingable then? I don't know what the comedi driver is
used for, but IIRC it is still in staging, so can you reproduce without
loading the comedi driver?

Best regards
Uwe


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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