Jan Kiszka a écrit :
Jean-Luc Pamart wrote:
Jan Kiszka a écrit :
Jean-Luc Pamart wrote:
Hello
I am a newbie with Xeno. My goal for the beginning of 2007 is to launch
a project for 4 french studiants : a box with Linux embedded and a usb
camera. The embedded application will analyse the movies in Real time
and lead a mobile machine with CAN-BUS.
Now i play with Xeno for my knowledge (without specific hardware) : a
little linux installed in a usb key with a little embedded distrib
- vanilla kernel 2.6.16 with patch for usb [.config is joint]
- Xenomai 2.1.2
- essentially BusyBox
- for xenomai : only "latency" directory and libs in usr/libs
I have checked "SMI woraround" for the kernel.
In BIOS I have UNchecked "legacy usb".
my Desktop PC (a AMD ATHLON) can boot with this little vanilla kernel
and
1/ a little embedded distrib of my own
OR
2/ a complete mandrake 9.1 on a partition of a classic hard disk
I have 2 differents problems when I lauch this :
1/ with the linux embedded directories on the usb key
high latency > 100 us are ok ? perhaps usb work is not compatible
with RT ?
Try loading the standard USB drivers (at least uhci_hcd) if they aren't
yet. Actually, I've seen boxes (granted, they were far older) where I
had to switch legacy USB *on* to avoid disturbances. In any case, check
carefully if you followed all tips in TROUBLESHOOTING regarding latency
issues (APM, ACPI, etc.).
2/ with the complete mandrake 9.1 :
it crashes X after 1 or few minutes.
What is the relation between X and Xenomai ?
Is Xenomai compatible with X ?
Yes, as long as X is not playing against us, e.g. by hard-disabling
interrupts or doing (too) evil things on the buses. Any non-GPL driver
in this game here (NVidia&Co)? Better avoid this. Also try to disable
accelerated mode in your X setup to see if things improve.
Jan
Ok , for the box with a vanilla kernel I will try the differents
possibilities. Actually i disable
a max of things ...
For the box with X : the big surprise was : very goods latencies
(comparativeley with no X !!)
Why ????
(Before crashing)
If it turns out to be an ACPI/APM issue, X may keep your box busier than
plain text mode, thus avoid those latency peaks by keeping it out of
certain sleep modes - well, an attempt to explain something I can't with
the currently available information...
for crashing
I 'll verify theses 2 points :
nvidia driver
accelerated mode : Is it a x server setup ?
See Gilles' reply => XF86Config.
Jan
PS: Don't forget to reply-to-all.
OK !
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