From owner-freebsd-usb@freebsd.org  Fri Apr 17 15:40:12 2020
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From: Hans Petter Selasky <hps@selasky.org>
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Date: Fri, 17 Apr 2020 17:38:36 +0200
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On 2020-04-17 17:35, Lev Serebryakov wrote:
> # sysctl hw.usb
> hw.usb.ucom.cons_baud: 9600
> hw.usb.ucom.cons_subunit: 0
> hw.usb.ucom.cons_unit: -1
> hw.usb.ucom.device_mode_console: 1
> hw.usb.ucom.pps_mode: 0
> hw.usb.uftdi.skip_jtag_interfaces: 1
> hw.usb.full_ddesc: 0
> hw.usb.no_cs_fail: 0
> hw.usb.disable_port_power: 0
> hw.usb.disable_enumeration: 0
> hw.usb.power_timeout: 30
> hw.usb.usb_lang_mask: 255
> hw.usb.usb_lang_id: 9
> hw.usb.template: -1
> hw.usb.debug: 0
> hw.usb.no_shutdown_wait: 0
> hw.usb.no_suspend_wait: 0
> hw.usb.no_boot_wait: 0
> #

Maybe the kernel was compiles w/o:

options USB_DEBUG

--HPS