>>> Is there a way to actively probe out for a device from a usb port?

>> New problem... the kernel is picking up what might be a second
>> LUN and throwing a lot of errors. If this LUN is real and intentional
>> I have no idea what purpose it would be for. It is not accessible
>> in a usual way with dd...
>> dd: /dev/da1: Device not configured
>> [Update: This has both soldered flash and microSD slot,
>> the second LUN may be the SD slot. Will test...]

Tested... the second LUN is the SD slot. With card in
both da0 and da1 are then usable in parallel.

> There is a quirk to force a single LUN:
> usbconfig -d X.Y add_quirk UQ_MSC_NO_GETMAXLUN

This quiets the errors when that empty LUN, but I wouldn't add it
as default to the kernel because then it does not detect
card in slot. Here is device quirk if anyone wants...


>> Also the kernel does not print USB 'port' number except on disconnect...
>>   kernel: umass0: at uhub3, port 5, addr 2 (disconnected)
>> It needs to print a corresponding 'connected' line on connect,
>> or perhaps add the 'port' in here...
>>   kernel: umass0: <NAME, class 0/0, rev 2.00/1.00, addr 2> on usbus3

In addition to fixing the above port printf, I believe this sense string
needs to delete the ' to ready change' part.

(probe0:umass-sim0:0:0:1): SCSI status error
(probe0:umass-sim0:0:0:1): TEST UNIT READY. CDB: 00 20 00 00 00 00
(probe0:umass-sim0:0:0:1): CAM status: SCSI Status Error
(probe0:umass-sim0:0:0:1): SCSI status: Check Condition
(probe0:umass-sim0:0:0:1): SCSI sense: UNIT ATTENTION asc:28,0 (Not
ready to ready change, medium may have changed)
(probe0:umass-sim0:0:0:1): Retrying command (per sense data)

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