JMicron jms561 umass on arm64?

[Peter Cornelius]

G'day, folks,                 [now with stupid webmailer formatting off, sorry]
 
Is there, by chance, anyone out there who has a JMicron jms561-based USB3 'umass' kind of device up & running who can share experience or quirks, please?
 
I'm trying to get mine [2] to work under FreeBSD [3] but it does not even show up with usbconfig list. While, with Raspbian, I was able to make it work easily.
 
Thanks,
 
Peter.
 
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[1] I believe, https://www.jmicron.com/file/download/1026/JMS561_Product+Brief.pdf
[2] https://wiki.radxa.com/Dual_Quad_SATA_HAT[https://wiki.radxa.com/Dual_Quad_SATA_HAT]
[3] Note: Later builds so far have not booted despite of current u-boot (March 2021)
    FreeBSD rpi4 14.0-CURRENT FreeBSD 14.0-CURRENT #1: Tue Feb 23 02:30:31 UTC 2021
    root at rpi4:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC  arm64