Displaying the Device Tree

The device tree can be displayed in three ways:

• The libdevinfo library provides interfaces to access the contents of the device tree programmatically.

• The prtconf(1M) command displays the complete contents of the device tree.

• The /devices hierarchy is a representation of the device tree. Use the ls(1) command to view the hierarchy.

/devices displays only devices that have drivers configured into the system. The prtconf(1M) command shows all device nodes regardless of whether a driver for the device exists on the system.

libdevinfo Library

The libdevinfo library provides interfaces for accessing all public device configuration data. See the libdevinfo(3LIB) man page for a list of interfaces.

prtconf Command

The following excerpted prtconf(1M) command example displays all the devices in the system.

System Configuration:  Sun Microsystems  sun4u
Memory size: 128 Megabytes
System Peripherals (Software Nodes):

SUNW,Ultra-5_10
    packages (driver not attached)
        terminal-emulator (driver not attached)
        deblocker (driver not attached)
        obp-tftp (driver not attached)
        disk-label (driver not attached)
        SUNW,builtin-drivers (driver not attached)
        sun-keyboard (driver not attached)
        ufs-file-system (driver not attached)
    chosen (driver not attached)
    openprom (driver not attached)
        client-services (driver not attached)
    options, instance #0
    aliases (driver not attached)
    memory (driver not attached)
    virtual-memory (driver not attached)
    pci, instance #0
        pci, instance #0
            ebus, instance #0
                auxio (driver not attached)
                power, instance #0
                SUNW,pll (driver not attached)
                se, instance #0
                su, instance #0
                su, instance #1
                ecpp (driver not attached)
                fdthree, instance #0
                eeprom (driver not attached)
                flashprom (driver not attached)
                SUNW,CS4231 (driver not attached)
            network, instance #0
            SUNW,m64B (driver not attached)
            ide, instance #0
                disk (driver not attached)
                cdrom (driver not attached)
                dad, instance #0
                sd, instance #15
        pci, instance #1
            pci, instance #0
                pci108e,1000 (driver not attached)
                SUNW,hme, instance #1
                SUNW,isptwo, instance #0
                    sd (driver not attached)
                    st (driver not attached)
                    sd, instance #0 (driver not attached)
                    sd, instance #1 (driver not attached)
                    sd, instance #2 (driver not attached)
                    ...
    SUNW,UltraSPARC-IIi (driver not attached)
    SUNW,ffb, instance #0
    pseudo, instance #0

/devices Directory

The /devices hierarchy provides a namespace that represents the device tree. Following is an abbreviated listing of the /devices namespace. The sample output corresponds to the example device tree and prtconf(1M) output shown previously.

/devices
/devices/pseudo
/devices/pci@1f,0:devctl
/devices/SUNW,ffb@1e,0:ffb0
/devices/pci@1f,0
/devices/pci@1f,0/pci@1,1
/devices/pci@1f,0/pci@1,1/SUNW,m64B@2:m640
/devices/pci@1f,0/pci@1,1/ide@3:devctl
/devices/pci@1f,0/pci@1,1/ide@3:scsi
/devices/pci@1f,0/pci@1,1/ebus@1
/devices/pci@1f,0/pci@1,1/ebus@1/power@14,724000:power_button
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:b
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:0,hdlc
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:1,hdlc
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:a,cu
/devices/pci@1f,0/pci@1,1/ebus@1/se@14,400000:b,cu
/devices/pci@1f,0/pci@1,1/ebus@1/ecpp@14,3043bc:ecpp0
/devices/pci@1f,0/pci@1,1/ebus@1/fdthree@14,3023f0:a
/devices/pci@1f,0/pci@1,1/ebus@1/fdthree@14,3023f0:a,raw
/devices/pci@1f,0/pci@1,1/ebus@1/SUNW,CS4231@14,200000:sound,audio
/devices/pci@1f,0/pci@1,1/ebus@1/SUNW,CS4231@14,200000:sound,audioctl
/devices/pci@1f,0/pci@1,1/ide@3
/devices/pci@1f,0/pci@1,1/ide@3/sd@2,0:a
/devices/pci@1f,0/pci@1,1/ide@3/sd@2,0:a,raw
/devices/pci@1f,0/pci@1,1/ide@3/dad@0,0:a
/devices/pci@1f,0/pci@1,1/ide@3/dad@0,0:a,raw
/devices/pci@1f,0/pci@1
/devices/pci@1f,0/pci@1/pci@2
/devices/pci@1f,0/pci@1/pci@2/SUNW,isptwo@4:devctl
/devices/pci@1f,0/pci@1/pci@2/SUNW,isptwo@4:scsi