Re: to list all the devices in freebsd &definition analyse

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 11/28/05

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    Date: Sun, 27 Nov 2005 16:40:01 -0700 (MST)
To: fierykylin@gmail.com

    In message: <87ab37ab0511261855lfc5d062h7d394f25bcd00ec0@mail.gmail.com>
                kylin <fierykylin@gmail.com> writes:
    : i can use pciconf in freebsd to list the pci device ,but how to list
    : the device tree in freeebsd?

    devinfo -v

    : i got some anornymous definition on devclass driver and device that
    : differ from the current man page
    : i think they seems reasonable but how can devclass Represents a bus
    : or leaf device driver while driver still Represents a bus or
    : leaf-level end-device driver ?
    : and device is just a instance of bus or (leaf) end-device.??
    : is it oop? can the disigner of the arch show us a word?:)
    :
    : devclass
    : Represents a bus or leaf device driver, e.g. pci_devclass (PCI bus),
    : ahc_devclass (Adaptec SCSI host-bus adapter). It contains a list of
    : drivers that belong to it. At run-time it also has a list populated by
    : device instances of this class indexed by unit numbers.
    : driver

    devclass is the information about all instances of the device.
    device_t is an instance of the device. The only difference between a
    bus and a device is that a bus has children.

    Warner
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