[Bug 266840] umodem: CH552 is not attached

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266840

--- Comment #3 from Tomoyuki Sakurai <trombik1973@gmail.com> ---
(In reply to Hans Petter Selasky from comment #2)

i understand what is going on (i think).

the board is a development board.
https://github.com/WeActStudio/WeActStudio.CH552CoreBoard

when a button is pressed and the dev board is plugged into a machine, the
bootloader, which accepts firmware, runs.

Oct  6 04:23:18 t480s kernel: ugen0.6: <vendor 0x4348 product 0x55e0> at usbus0

after 10 sec, it runs the user application (probably, an example firmware). the 

Oct  6 04:23:27 t480s kernel: ugen0.6: <vendor 0x4348 product 0x55e0> at usbus0
(disconnected)
Oct  6 04:23:27 t480s kernel: ugen0.6: <Deqing CH55xduino> at usbus0
Oct  6 04:23:27 t480s kernel: umodem0 on uhub0
Oct  6 04:23:27 t480s kernel: umodem0: <CDC Serial> on usbus0
Oct  6 04:23:27 t480s kernel: umodem0: data interface 0, has no CM over data,
has no break
Oct  6 04:23:27 t480s kernel: umodem0: Can't setup transfer
Oct  6 04:23:27 t480s kernel: device_attach: umodem0 attach returned 6

my understanding is that, if vendor and product ID are defined and added to
umodem_host_devs in umodem.c, it should work when the bootloader is running. am
I correct?

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