USB device fails to attach

I am trying to use an old CF card reader.  The reader itself works, my
Linux laptop attaches it as:

  usb 2-2: new high-speed USB device number 17 using xhci_hcd
  usb 2-2: New USB device found, idVendor=058f, idProduct=6362, bcdDevice= 1.00
  usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  usb 2-2: Product: Mass Storage Device
  usb 2-2: Manufacturer: Generic
  usb 2-2: SerialNumber: 058F312D81B1
  usb-storage 2-2:1.0: USB Mass Storage device detected
  scsi host3: usb-storage 2-2:1.0
  scsi 3:0:0:0: Direct-Access     Generic  USB SD Reader    1.00 PQ: 0 ANSI: 0
  scsi 3:0:0:1: Direct-Access     Generic  USB CF Reader    1.01 PQ: 0 ANSI: 0
  scsi 3:0:0:2: Direct-Access     Generic  USB SM Reader    1.02 PQ: 0 ANSI: 0
  scsi 3:0:0:3: Direct-Access     Generic  USB MS Reader    1.03 PQ: 0 ANSI: 0
  sd 3:0:0:0: Attached scsi generic sg2 type 0
  sd 3:0:0:1: Attached scsi generic sg3 type 0
  sd 3:0:0:0: [sdc] Media removed, stopped polling
  sd 3:0:0:2: Attached scsi generic sg4 type 0
  sd 3:0:0:3: Attached scsi generic sg5 type 0
  sd 3:0:0:1: [sdd] Media removed, stopped polling
  sd 3:0:0:0: [sdc] Attached SCSI removable disk
  sd 3:0:0:2: [sde] Media removed, stopped polling
  sd 3:0:0:1: [sdd] Attached SCSI removable disk
  sd 3:0:0:3: [sdf] Media removed, stopped polling
  sd 3:0:0:3: [sdf] Attached SCSI removable disk
  sd 3:0:0:2: [sde] Attached SCSI removable disk


But my intel mac mini with NetBSD 10.1 fails with:

  uhub1: port 1, set config at addr 18 failed
  uhub1: autoconfiguration error: device problem, disabling port 1

Other devices work in this port, e.g.:

  uhidev0 at uhub1 port 1 configuration 1 interface 0
  uhidev0: Mitsumi Electric (0x05ac) Apple Optical USB Mouse (0x0304), rev 1.10/1.10, addr 16, iclass 3/1
  ...
  umass0 at uhub0 port 1 configuration 1 interface 0
  umass0: JetFlash (0x8564) Mass Storage Device (0x1000), rev 3.00/11.00, addr 17
  ...

Any leads on how do I debug this?  TIA.


-uwe