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RPI4 usb, external ssd

I have a RPI4.  I installed 10.0_RC3 and have updated to RC4.  It's
working fine for the most part.

I am using the bootcode that comes with NetBSD 10.  It is connected via

I got a new Samsung T7 SSD and plugged it in, to one of the blue ports,
assuming they were USB3.

Despite rebooting, I don't see it appear.

(I have a similar umass plugged into a RPI3 running NetBSD 9, which
works slowly but fine.)

I put the T7 in my regular computer and it appeared as expected:

  umass0 at uhub0 port 1 configuration 1 interface 0
  umass0: Samsung (0x04e8) PSSD T7 (0x4001), rev 3.20/1.00, addr 6
  umass0: using SCSI over Bulk-Only
  scsibus0 at umass0: 2 targets, 1 lun per target
  sd0 at scsibus0 target 0 lun 0: <Samsung, PSSD T7, 0> disk fixed

I put a USB thumbdrive that I know works into the RPI4, and it too is
not appearing.  I conclude that the T7 is fine and that either there is
a NetBSD bug, I did the install wrong, or my RPI4 is defective.

On the RPI4, I see in dmesg

  dwctwo0 at simplebus1: USB controller
  usb0 at dwctwo0: USB revision 2.0
  uhub0 at usb0: NetBSD (0x0000) DWC2 root hub (0x0000), class 9/0, rev 2.00/1.00, addr 1
  uhub0: 1 port with 1 removable, self powered


  #> usbdevs -v
  Controller /dev/usb0:
  addr 1: high speed, self powered, config 1, DWC2 root hub(0x0000), NetBSD(0x0000), rev 1.00(0x0100)
   port 1 disabled

Does umass work for people in general?  Am I missing something?

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