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
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