[Bug 266840] umodem: CH552 is not attached

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

--- Comment #7 from Tomoyuki Sakurai <trombik1973@gmail.com> ---
(In reply to Hans Petter Selasky from comment #5)

things get clearer. there are several tools to upload firmware.

https://github.com/MarsTechHAN/ch552tool
https://github.com/hexeguitar/CH55x_python_flasher

although i haven't looked at the sources yet, my guess is that, there is no
kernel driver for the bootloader. when the bootloader is running, these tools
directly talk to it using a protocol.

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