On 02/08/11 15:57, Martyn Welch wrote: > > Which part of the example udev rule I gave is a fixed identifier? It > identifies the CDROM based on system topology, using the PCI bus numbering and > SCSI bus numbering. > > For example, for a device sitting on VME, in the A32 address space at 0x30000, > via a PCI-VME bridge on PCI bus 2, device 0d, we could provide something like > this: > > vme-a32:30000-pci-0000:02:0d.0 > Hmm, thinking about it, that's not right either. The VME bridge would be at "pci-0000:02:0d.0". In the current scheme this would be given a bus number and we should be able to discover from sysfs which bus numbers are used for which VME bridges. For example, as the usb buses are enumerated: $ ls -la /sys/bus/usb/devices/usb* lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb1 -> ../../../devices/pci0000:00/0000:00:1a.7/usb1 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb2 -> ../../../devices/pci0000:00/0000:00:1d.7/usb2 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb3 -> ../../../devices/pci0000:00/0000:00:1a.0/usb3 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb4 -> ../../../devices/pci0000:00/0000:00:1a.1/usb4 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb5 -> ../../../devices/pci0000:00/0000:00:1a.2/usb5 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb6 -> ../../../devices/pci0000:00/0000:00:1d.0/usb6 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb7 -> ../../../devices/pci0000:00/0000:00:1d.1/usb7 lrwxrwxrwx 1 root root 0 2011-08-03 09:29 /sys/bus/usb/devices/usb8 -> ../../../devices/pci0000:00/0000:00:1d.2/usb8 $ Whilst it would be nice to be able to change the bus numbering, I don't think that passing numbers into the bridge driver at load time is the correct approach. Martyn -- Martyn Welch (Principal Software Engineer) | Registered in England and GE Intelligent Platforms | Wales (3828642) at 100 T +44(0)127322748 | Barbirolli Square, Manchester, E martyn.welch@xxxxxx | M2 3AB VAT:GB 927559189 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
