USB micro SD card readers HBA error on current (Silicon Motion)

[David Brownlee <abs%absd.org@localhost>]

NetBSD/amd64 5.99.44 from earlier this week.

I have three USB micro SD readers - two of which fail to attach on
NetBSD. All work fine on Windows XP.

-- Lexar LRWM01U-7000 --
umass0 at uhub3 port 1 configuration 1 interface 0
umass0: Silicon Motion, Inc. Generic USB2.0 card, rev 2.00/1.00, addr 4
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <Generic, USB  SD Reader, 1.00> disk removable
sd0(umass0:0:0:0): generic HBA error
sd0: drive offline
sd0(umass0:0:0:0): generic HBA error
sd0: unable to open device, error = 5

-- Kingston Micro READER --
umass0 at uhub3 port 1 configuration 1 interface 0
umass0: Silicon Motion, Inc. Generic USB2.0 card, rev 2.00/1.00, addr 4
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <Generic, USB  SD Reader, 1.00> disk removable
sd0(umass0:0:0:0): generic HBA error
sd0: drive offline
sd0(umass0:0:0:0): generic HBA error
sd0: unable to open device, error = 5

-- Noname --
umass0 at uhub3 port 1 configuration 1 interface 0
umass0: USB FLASH DISK USB FLASH DISK, rev 2.00/2.01, addr 4
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <USB Mass, Storage Device,
\001\000\000\001> disk removable
sd0: fabricating a geometry
sd0: 968 MB, 968 cyl, 64 head, 32 sec, 512 bytes/sect x 1984000 sectors
sd0: fabricating a geometry

Any suggestions on how to debug this - I noticed that both the failing
readers are Silicon Motion, Inc. Is this quirk related?