CURRENT: PCengines APU2C4 SanDisk UltraFit USB 3.0 32G failure: error 19

[O. Hartmann]

Trying to use a SanDisk 32GB UltraFit USB 3.0 Flash drive as boot device with a PCengine
APU2C4, booting recent CURRENT (r305893) fails with error 19:

[...]
ugen1.2: <vendor 0x0438> at usbus1
uhub2 on uhub1
uhub2: <vendor 0x0438 product 0x7900, class 9/0, rev 2.00/0.18, addr 2> on usbus1
ugen0.2: <SanDisk> at usbus0
umass0 on uhub0
umass0: <SanDisk Ultra Fit, class 0/0, rev 2.10/1.00, addr 1> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0xc100
umass0:2:0: Attached to scbus2
uhub2: 4 ports with 4 removable, self powered
mountroot: waiting for device /dev/ufs/Rs1a...
Mounting from ufs:/dev/ufs/Rs1a failed with error 19.

The very same NanoBSD image put to SD or USB 2.0 flash drive does boot!

I tried tinyLinux with the same flash drive and it worked. 

Are there any hints how to make this flash drive work?

Kind regards,

oh
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