Date: Sat, 20 Mar 2004 18:43:36 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: ticso@cicely.de, ticso@cicely12.cicely.de Cc: arch@freebsd.org Subject: Re: Opinions about using USB serial numbers Message-ID: <20040320.184336.88475380.imp@bsdimp.com> In-Reply-To: <20040320052007.GC33602@cicely12.cicely.de> References: <20040320052007.GC33602@cicely12.cicely.de>
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In message: <20040320052007.GC33602@cicely12.cicely.de> Bernd Walter <ticso@cicely12.cicely.de> writes: : I have a lot to do with systems using many USB devices of the same : kind. : Currently device are named acording to their probing order. : That result in the problematic that device names can change after : reboot or replugging in different order. : : I would like to add functionality for creating alias devnodes : including the serial numbers (if the device has one setup). : E.g. for a ucom(4) device you will get /dev/ucom0 and ucom.serialnumber. : If the device has no serial numer there will be just /dev/ucom0 : as befor. : : Another solution could be to create the nodes in a tree form: : /dev/usbchannel0/hubport1/pubport2/ucom : That would work for devices without serial numbers too, but I : personally dislike this way. I'd rather that we have a generic binding of a device instance number to a pnp location. However, having said that, you can use devd to extract the information from the node and then create a symbolic link... Warner
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